Trecora Resources (TREC) 10-K 9 Mar 21 2020 FY Annual report Financial data

Cover

Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Feb. 26, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-33926
Entity Registrant Name	TRECORA RESOURCES
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	75-1256622
Entity Address, Address Line One	1650 Hwy 6 S, Suite 190
Entity Address, City or Town	Sugar Land
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77478
City Area Code	281
Local Phone Number	980-5522
Title of 12(b) Security	Common Stock, par value $0.10 per share
Trading Symbol	TREC
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 119
Entity Common Stock, Shares Outstanding		24,834,693
Documents Incorporated by Reference	Certain information required to be furnished pursuant to Part III of this Form 10–K will be set forth in, and will be incorporated by reference from, the registrant’s definitive proxy statement for the 2021 Annual Meeting of Stockholders anticipated to be held on May 14, 2021 to be filed by the registrant with the Securities and Exchange Commission pursuant to Regulation 14A within 120 days after the registrant’s fiscal year ended December 31, 2020.
Entity Central Index Key	0000007039
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS
Cash and cash equivalents	$ 55,664	$ 6,145
Trade receivables, net	25,301	26,320
Inventories	12,945	13,624
Investment in AMAK (held-for-sale)	0	32,872
Prepaid expenses and other assets	9,198	4,947
Taxes receivable	2,788	182
Total current assets	105,896	84,090
PLANT, PIPELINE, AND EQUIPMENT, NET	187,104	188,919
OPERATING LEASE ASSETS, NET	10,528	13,512
Intangible assets, net	12,893	14,736
MINERAL PROPERTIES	412	562
TOTAL ASSETS	316,833	301,819
CURRENT LIABILITIES
Accounts payable	14,447	14,603
Accrued liabilities	6,857	5,742
Current portion of long-term debt	4,194	4,194
Current portion of operating lease	3,195	3,174
Current portion of other liabilities	891	922
Total current liabilities	29,584	28,635
CARES ACT, PPP Loans	6,123	0
LONG-TERM DEBT, net of current portion	41,901	79,095
POST- RETIREMENT BENEFIT, net of current portion	320	338
OPERATING LEASE LONG TERM	7,333	10,338
OTHER LIABILITIES, net of current portion	648	595
DEFERRED INCOME TAXES	26,517	11,375
Total liabilities	112,426	130,376
Commitments and Contingencies
EQUITY
Common Stock ‑ authorized 40 million shares of $.10 par value; issued 24.8 and 24.6 million in 2020 and 2019, respectively, and outstanding 24.8 and 24.5 million in 2020 and 2019, respectively	2,483	2,475
Additional Paid-in Capital	61,311	59,530
Retained Earnings	140,324	109,149
Total Trecora Resources Stockholders' Equity	204,118	171,154
Noncontrolling interest	289	289
Total equity	204,407	171,443
TOTAL LIABILITIES AND EQUITY	$ 316,833	$ 301,819

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares shares in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Common stock, shares authorized (in shares)	40	40
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares issued (in shares)	24.8	24.6
Common stock, shares outstanding (in shares)	24.8	24.5

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Revenues	$ 208,626	$ 258,959	$ 287,932
Operating costs and expenses
Cost of sales and processing (including depreciation and amortization of $15,300, $15,361, and $13,618, respectively)	179,948	220,444	260,114
Gross Profit	28,678	38,515	27,818
General and Administrative Expenses
General and administrative	24,892	24,386	22,532
Impairment of goodwill and certain intangibles	0	24,152	0
Restructuring and severance	0	0	2,347
Depreciation	848	840	740
Total General and Administrative Expenses	25,740	49,378	25,619
Operating income (loss)	2,938	(10,863)	2,199
Other expenses
Interest expense	2,491	5,139	4,100
Loss on extinguishment of debt	0	0	315
Loss on disposal of assets	39	680	0
Miscellaneous (income) expense	(595)	(232)	158
Total other income (expense)	1,935	5,587	4,573
Income (loss) from continuing operations before income tax benefit	1,003	(16,450)	(2,374)
Income tax benefit	3,963	3,566	646
Income (loss) from continuing operations	4,966	(12,884)	(1,728)
Income (loss) from discontinued operations, net of tax	26,209	(2,090)	(604)
Net income (loss)	$ 31,175	$ (14,974)	$ (2,332)
Basic income (loss) per common share:
Net income (loss) from continuing operations (in dollars per share)	$ 0.20	$ (0.52)	$ (0.07)
Net income (loss) from discontinued operations, net of tax (in dollars per share)	1.06	(0.08)	(0.02)
Net income (loss) (in dollars per share)	$ 1.26	$ (0.61)	$ (0.10)
Basic weighted average number of common shares outstanding (in shares)	24,802	24,698	24,438
Diluted income (loss) per common share:
Net income (loss) from continuing operations (in dollars per share)	$ 0.20	$ (0.52)	$ (0.07)
Net income (loss) from discontinued operations, net of tax (in dollars per share)	1.03	(0.08)	(0.02)
Net income (loss) (in dollars per share)	$ 1.23	$ (0.61)	$ (0.10)
Diluted weighted average number of common shares outstanding (in shares)	25,356	24,698	24,438
Product sales
Revenues
Revenues	$ 192,375	$ 243,314	$ 269,780
Processing fees
Revenues
Revenues	$ 16,251	$ 15,645	$ 18,152

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Depreciation and amortization	$ 15,300	$ 15,361	$ 13,618

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Trecora Resources	Noncontrolling Interest
Balance (in shares) at Dec. 31, 2017		24,311
Balance at Dec. 31, 2017	$ 185,011	$ 2,451	$ 56,012	$ (196)	$ 126,455	$ 184,722	$ 289
Stock options
Issued to Directors	(10)		(10)			(10)
Issued to Employees	154		154			154
Cancellations	(680)		(680)			(680)
Restricted stock units
Issued to Directors	338		338			338
Issued to Employees	1,939		1,939			1,939
Common stock
Issued to Directors (in shares)		188
Issued to Directors	588	$ 10	489	89		588
Issued to Employees (in shares)		183
Issued to Employees	284	$ 2	127	155		284
Stock Exchange (in shares)		(65)
Stock Exchange	(131)		(66)	(65)		(131)
Warrants exercised (in shares)		9
Warrants exercised	0		(9)	9
Net Income (Loss)	(2,332)				(2,332)	(2,332)
Balance (in shares) at Dec. 31, 2018		24,626
Balance at Dec. 31, 2018	185,161	$ 2,463	58,294	(8)	124,123	184,872	289
Restricted stock units
Issued to Directors	353		353			353
Issued to Employees	883		883			883
Common stock
Issued to Directors (in shares)		20
Issued to Directors	9	$ 1		8		9
Issued to Employees (in shares)		104
Issued to Employees	11	$ 11				11
Stock Exchange	0
Net Income (Loss)	$ (14,974)				(14,974)	(14,974)
Balance (in shares) at Dec. 31, 2019	24,500	24,750
Balance at Dec. 31, 2019	$ 171,443	$ 2,475	59,530	0	109,149	171,154	289
Restricted stock units
Issued to Directors	1,369		1,369			1,369
Issued to Employees	420		420			420
Common stock
Issued to Directors (in shares)		56
Issued to Directors	0	$ 5	(5)
Issued to Employees (in shares)		27
Issued to Employees	0	$ 3	(3)
Stock Exchange	0
Net Income (Loss)	$ 31,175				31,175	31,175
Balance (in shares) at Dec. 31, 2020	24,800	24,833
Balance at Dec. 31, 2020	$ 204,407	$ 2,483	$ 61,311	$ 0	$ 140,324	$ 204,118	$ 289

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING ACTIVITIES
Net Income (Loss)	$ 31,175	$ (14,974)	$ (2,332)
Income (Loss) from Discontinued Operations	26,209	(2,090)	(604)
Income (Loss) from Continuing Operations	4,966	(12,884)	(1,728)
Adjustments to reconcile Income (Loss) from Continuing Operations to Net Cash Provided by Operating Activities:
Depreciation and Amortization	14,306	14,345	12,497
Amortization of Intangible Assets	1,842	1,856	1,861
Stock-based Compensation	1,912	1,250	1,753
Deferred Income Taxes	14,553	(2,993)	(1,377)
Postretirement Obligation	(7)	(38)	(825)
Bad Debt Expense (Recoveries)	0	(23)	152
Amortization of Loan Fees	181	181	261
Loss on Extinguishment of Debt	0	0	315
Loss on Disposal of Assets	39	680	0
Impairment of Goodwill and Certain Intangibles	0	24,152	0
Changes in Operating Assets and Liabilities:
(Increase) Decrease in Trade Receivables	1,018	816	(1,485)
(Increase) Decrease in Taxes Receivable	(2,606)	0	5,401
Decrease in Inventories	680	2,914	1,911
(Increase) Decrease in Prepaid Expenses and Other Assets	(2,403)	(304)	(1,222)
Increase (Decrease) in Other Liabilities	(5,739)	581	33
Increase (Decrease) in Accounts Payable and Accrued Liabilities	831	(4,944)	2,202
Net Cash Provided by Operating Activities - Continuing Operations	29,573	25,589	19,749
Net Cash (Used in) Provided by Operating Activities - Discontinued Operations	(4,008)	(468)	146
Net Cash Provided by Operating Activities	25,565	25,121	19,895
INVESTING ACTIVITIES
Additions to Plant, Pipeline and Equipment	(13,351)	(10,079)	(25,285)
Proceeds from PEVM	150	27	0
Net Cash Used in Investing Activities - Continuing Operations	(13,201)	(10,052)	(25,285)
Net Cash Provided by Investing Activities - Discontinued Operations	68,530	4,021	5,414
Net Cash Provided by (Used in) Investing Activities	55,329	(6,031)	(19,871)
FINANCING ACTIVITIES
Net Cash (Paid) Received Related to Stock-Based Compensation	(123)	(305)	860
Additions to CARES Act, PPP Loans	6,123	0	0
Additions to Long-Term Debt	20,000	2,000	18,177
Repayment of Long-Term Debt	(57,375)	(21,375)	(15,354)
Net Cash (Used in) Provided by Financing Activities	(31,375)	(19,680)	3,683
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	49,519	(590)	3,707
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	6,145	6,735	3,028
CASH AND CASH EQUIVALENTS AT END OF YEAR	55,664	6,145	6,735
Supplemental disclosure of cash flow information:
Cash payments for interest	2,266	4,731	4,560
Cash payments (net of refunds) for taxes	(11,069)	53	(4,182)
Supplemental disclosure of non-cash items:
Capital expansion amortized to depreciation expense	821	792	787
Cash held in escrow by AMAK	1,877	0	0
Foreign taxes paid by AMAK	270	0	0
Stock exchange	$ 0	$ 0	$ 131

BUSINESS AND OPERATIONS OF THE

BUSINESS AND OPERATIONS OF THE COMPANY	12 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BUSINESS AND OPERATIONS OF THE COMPANY	BUSINESS AND OPERATIONS OF THE COMPANY Trecora Resources (the “Company”) was organized as a Delaware corporation in 1967. The Company’s principal business activities are the manufacturing of various specialty petrochemicals products, specialty waxes and providing custom processing services. The Company’s specialty petrochemicals operations are primarily conducted through a wholly-owned subsidiary, Texas Oil and Chemical Co. II, Inc. (“TOCCO”). TOCCO owns all of the capital stock of South Hampton Resources, Inc. (“SHR”) and Trecora Chemical, Inc. (“TC”). SHR owns all of the capital stock of Gulf State Pipe Line Company, Inc. (“GSPL”). SHR owns and operates a specialty petrochemicals product facility in Silsbee, Texas which manufactures high purity hydrocarbons used primarily in polyethylene, packaging, polypropylene, expandable polystyrene, poly-iso/urethane foams, Canadian tar sands, and in the catalyst support industry. TC owns and operates a facility located in Pasadena, Texas which manufactures specialty waxes and provides custom processing services. These specialty waxes are used in the production of coatings, hot melt adhesives and lubricants. GSPL owns and operates pipelines that connect the SHR facility to a natural gas line, to SHR’s truck and rail loading terminal and to a major petroleum pipeline owned by an unaffiliated third party. The Company owns approximately 55% of the capital stock of a Nevada mining company, Pioche Ely Valley Mines, Inc. (“PEVM”), which does not conduct any substantial business activity but owns undeveloped properties in the United States. The Company also previously owned 33% of a Saudi Arabian joint stock company, Al Masane Al Kobra Mining Company (“AMAK”). On October 2, 2019, we announced that we had entered into a Share Sale and Purchase Agreement (as amended, the “Purchase Agreement”) pursuant to which we agreed to sell our entire investment in AMAK. The share sale was completed on September 28, 2020. For more information, see Note 6. We attribute revenues to countries based upon the origination of the transaction. All of our revenues for the years ended December 31, 2020, 2019, and 2018, originated in the United States. In addition, all of our long-lived assets are in the United States. For convenience in this report, the terms “Company", “our", “us", “we" or “TREC" may be used to refer to Trecora Resources and its subsidiaries.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation – The Consolidated Financial Statements include the balance sheets, statements of operations, stockholders' equity, and cash flows of the Company, TOCCO, TC, SHR, GSPL and PEVM. Other entities which are not controlled but over which the Company has the ability to exercise significant influence are accounted for using the equity method of accounting. All intercompany profits, transactions and balances have been eliminated. Cash, Cash Equivalents and Short-Term Investments – Our principal banking and short-term investing activities are with local and national financial institutions. Short-term investments with an original maturity of three months or less are classified as cash equivalents. Inventories – For SHR, finished products and feedstock are recorded at the lower of cost, determined on the first-in, first-out method (FIFO), or market. For TC, inventory is recorded at the lower of cost or market as follows: (1) raw material cost is calculated using the weighted-average cost method and (2) product inventory cost is calculated using the specific cost method. Trade Receivables and Allowance for Doubtful Accounts – We evaluate the collectability of our trade receivables and adequacy of the allowance for doubtful accounts based upon historical experience and any specific customer financial difficulties of which we become aware. For the year ended December 31, 2020, we decreased the allowance for doubtful accounts balance by $129,000 due to the write off of previously allowed for receivables. For the year ended December 31, 2019, we decreased the balance by $23,000 due to collections of previously allowed for receivables. For the year ended December 31, 2018, we increased the balance by $152,000 due to concerns regarding collectability for a specific customer. We track customer balances and past due amounts to determine if customers may be having financial difficulties. This, along with historical experience and a working knowledge of each customer, helps determine accounts that should be written off. Amounts written off were $129,000, nil and nil in 2020, 2019 and 2018, respectively. Discontinued Operations – Assets that are sold or classified as held for sale are classified as discontinued operations provided that the disposal represents a strategic shift that has (or will have) a major effect on our operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method investment or other major parts of an entity). Plant, Pipeline and Equipment – Plant, pipeline and equipment are stated at cost. Depreciation is provided over the estimated service lives using the straight-line method. Gains and losses from disposition are included in operations in the period incurred. Maintenance and repairs are expensed as incurred. Major renewals and improvements are capitalized. Interest costs incurred to finance expenditures during construction phase are capitalized as part of the historical cost of constructing the assets. Construction commences with the development of the design and ends when the assets are ready for use. Capitalized interest costs are included in plant, pipeline and equipment and are depreciated over the service life of the related assets. Labor costs incurred to self-construct assets are capitalized as part of the historical cost the assets. Construction commences with the development of the design and ends when the assets are ready for use. Capitalized labor costs are included in plant, pipeline and equipment and are depreciated over the service life of the related assets. Platinum catalyst is included in plant, pipeline and equipment at cost. Amortization of the catalyst is based upon cost less estimated salvage value of the catalyst using the straight line method over the estimated useful life (see Note 8). Leases – The Company enters into leases as a lessee for rail cars, rail equipment, office space and office equipment in the ordinary course of business. When procuring services, or upon entering into a contract, the Company determines whether an arrangement contains a lease at its inception. As part of that evaluation the Company considers whether there is an implicitly or explicitly identified asset in the arrangement and whether the Company, as the lessee, has the right to control the use of that asset. The Company also reviews all options to extend, terminate, or purchase its right-of-use assets at the inception of the lease and accounts for these options when they are reasonably certain of being exercised. All leases with a term of more than 12 months are recognized as right-of-use (“ROU”) assets and associated lease liabilities in the combined balance sheet. Lease liabilities are measured at the lease commencement date and determined using the present value of the lease payments not yet paid, at the Company’s incremental borrowing rate, which approximates the rate at which the Company would borrow on a secured basis. The interest rate implicit in the lease is generally not determinable in the transactions where the Company is the lessee. The ROU asset equals the lease liability adjusted for any initial direct costs, prepaid rent and lease incentives. All of the Company’s leases are classified as operating leases. The leases include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. The Company made a policy election to not recognize leases with a lease term of 12 months or less in the combined balance sheet. Lease expense for these leases is recognized on a straight-line basis over the lease term. Goodwill and Other Intangible Assets – Goodwill and indefinite-lived intangible assets are tested for impairment at least annually; however, these tests are performed more frequently when events or changes in circumstances indicate that the asset may be impaired. Impairment exists when carrying value exceeds fair value. Estimates of fair value are based on appraisals, market prices for comparable assets, or internal estimates of future net cash flows. Definite-lived intangible assets consist of customer relationships, licenses, permits and developed technology. The majority of these assets are being amortized using discounted estimated future cash flows over the term of the related agreements. Intangible assets associated with customer relationships are being amortized using the discounted estimated future cash flows method based upon assumed rates of annual customer attrition. We continually evaluate the reasonableness of the useful lives of these assets. Once these assets are fully amortized, they will be removed from the consolidated balance sheets. During 2019 we adopted new accounting guidance and removed the second step of the goodwill impairment test. Under step two, an entity was required to determine the fair value of individual assets and liabilities of a reporting unit (including unrecognized assets and liabilities) using the procedure for determining fair values in a business combination. As a result, goodwill impairment is now measured at the amount by which a reporting unit’s carrying amount exceeds its fair value, with any impairment charge limited to the carrying amount of goodwill. Business Combinations and Related Business Acquisition Costs – Assets and liabilities associated with business acquisitions are recorded at fair value using the acquisition method of accounting. We allocate the purchase price of acquisitions based upon the fair value of each component which may be derived from various observable and unobservable inputs and assumptions. We may use third-party valuation specialists to assist us in this allocation. Initial purchase price allocations are preliminary and subject to revision within the measurement period, not to exceed one year from the date of acquisition. The fair value of property, plant and equipment and intangible assets are based upon the discounted cash flow method that involves inputs that are not observable in the market (Level 3). Goodwill assigned represents the amount of consideration transferred in excess of the fair value assigned to identifiable assets acquired and liabilities assumed. Business acquisition costs are expensed as incurred and are reported as general and administrative expenses in the consolidated statements of income. We define these costs to include finder’s fees, advisory, legal, accounting, valuation, and other professional consulting fees, as well as, travel associated with the evaluation and effort to acquire specific businesses. Investment in AMAK – Prior to the completion of the sale of our ownership interest in AMAK, we accounted for our investment in AMAK using the equity method of accounting under which we recorded in income our share of AMAK’s income or loss for each period. The amount recorded was also adjusted to reflect the amortization of certain differences between the basis in our investment in AMAK and our share of the net assets of AMAK was reflected in AMAK’s financial statements (see Note 6). Any proceeds received from or payments made to AMAK were recorded as decreases or increases in the balance of our investment. Other Assets – Other assets include a license used in specialty petrochemicals operations, spare parts inventory, insurance receivables and certain specialty petrochemicals assets. Spare parts are accounted for using FIFO. Long-Lived Assets Impairment – Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable based on the undiscounted net cash flows to be generated from the asset’s use. The amount of the impairment loss to be recorded is calculated by the excess of the asset’s carrying value over its fair value. Fair value is generally determined using a discounted cash flow analysis although other factors including the state of the economy are considered. Revenue Recognition – Revenue is measured based on a consideration specified in a contract with a customer. The Company recognizes revenue when it satisfies a performance obligation by transferring control over a product or service to a customer. In evaluating when a customer has control of the asset we primarily consider whether the transfer of legal title and physical delivery has occurred, whether the customer has significant risks and rewards of ownership, and whether the customer has accepted delivery and a right to payment exists. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from revenue. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are included in cost of product sales and processing. The Company does not offer material rights of return or service-type warranties. The following is a description of principal activities – separated by reportable segments – from which the Company generates its revenue. For more detailed information about reportable segments, disaggregation of revenues, and contract balance disclosures, see Note 17. Specialty Petrochemicals segment The Specialty Petrochemicals segment of the Company produces eight high purity hydrocarbons and other petroleum based products including isopentane, normal pentane, isohexane and hexane. These products are used in the production of polyethylene, packaging, polypropylene, expandable polystyrene, poly-iso/urethane foams, crude oil from the Canadian tar sands, and in the catalyst support industry. SHR’s specialty petrochemicals products are typically transported to customers by rail car, tank truck, iso-container and ship. Product Sales – The Company sells individual (distinct) products to its customers on a stand-alone basis (point-of-sale) without any further integration. There is no significant modification of any one or more products sold to fulfill another promised product or service within any of the Company’s product sale transactions. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment for prime product sales is typically due and collected 30 to 60 days subsequent to point of sale. Processing Fees – The Company’s services consist of processing customer supplied feedstocks into custom products including, if requested, services for forming, packaging, and arranging shipping. Pursuant to Tolling Agreements the customer retains title to the feedstocks and processed products. The performance obligation in each Tolling Agreement transaction is the processing of customer provided feedstocks into custom products and is satisfied over time. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment is typically due and collected within 30 days subsequent to point of sale. Specialty Waxes segment The Specialty Waxes segment of the Company manufactures and sells specialty polyethylene and poly alpha olefin waxes and also provides custom processing services for customers. Product Sales – The Company sells individual (distinct) products to its customers on a stand-alone basis (point-of-sale) without any further integration. There is no significant modification of any one or more products sold to fulfill another promised product or service within any of the Company’s product sale transactions. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment is typically due and collected within 30 days subsequent to point of sale. Processing Fees – The Company’s promised services consist of processing customer supplied feedstocks into custom products including, if requested, services for forming, packaging, and arranging shipping. Pursuant to Tolling Agreements and Purchase Order Arrangements, the customer typically retains title to the feedstocks and processed products. The performance obligation in each Tolling Agreement transaction and Purchase Order Arrangement is the processing of customer provided feedstocks into custom products and is satisfied over time. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment is typically due and collected within 30 days subsequent to point of sale. Shipping and Handling Costs – Shipping and handling costs are classified as cost of product sales and processing and are expensed as incurred. Retirement Plan – We offer employees the benefit of participating in a 401(k) plan. We match 100% up to 6% of pay with vesting occurring over 2 years. For years ended December 31, 2020, 2019, and 2018, matching contributions of approximately $1,271,000, $1,321,000, and $1,502,000, respectively, were made on behalf of employees. Environmental Liabilities – Remediation costs are accrued based on estimates of known environmental remediation exposure. Ongoing environmental compliance costs, including maintenance and monitoring costs, are expensed as incurred. Other Liabilities – We periodically make changes in or expand our custom processing units at the request of the customer. The cost to make these changes is shared by the customer. Upon completion of a project a note receivable and a deferred liability are recorded to recover the project costs which are then capitalized. At times instead of a note receivable being established, the customer pays an upfront cost. The amortization of other liabilities is recorded as a reduction to depreciation expense over the life of the contract with the customer. As of December 31 of each year, depreciation expense was offset and reduced by approximately $0.8 million, $0.8 million, and $0.8 million, for 2020, 2019, and 2018, respectively. Net Income Per Share – We compute basic income per common share based on the weighted-average number of common shares outstanding. Diluted income per common share is computed based on the weighted-average number of common shares outstanding plus the number of additional common shares that would have been outstanding if potential dilutive common shares, consisting of stock options, unvested restricted stock units, and shares which could be issued upon conversion of debt, had been issued (see Note 18). Foreign Currency – The functional currency for the Company and each of the Company’s subsidiaries is the US dollar (USD). Transaction gains or losses as a result of transactions denominated and settled in currencies other than the USD are reflected in the statements of income as foreign exchange transaction gains or losses. We do not employ any practices to minimize foreign currency risks. The functional and reporting currency of AMAK is the Saudi Riyal (SR). In June 1986 the SR was officially pegged to the USD at a fixed exchange rate of 1 USD to 3.75 SR; therefore, we translate SR into our reporting currency of the USD for income statement and balance sheet purposes using the fixed exchange rate. As of December 31, 2020, 2019 and 2018, foreign currency translation adjustments were not significant. Management Estimates – The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Significant estimates include allowance for doubtful accounts receivable and inventory obsolescence; assessment of impairment of our long-lived assets and intangible assets; litigation liabilities, post-retirement benefit obligations, guarantee obligations, environmental liabilities, and current and deferred income taxes. Actual results could differ from these estimates. In early 2020, the World Health Organization declared the rapidly spreading coronavirus disease (“COVID-19”) outbreak a pandemic. This pandemic has resulted in governments worldwide enacting emergency measures to combat the spread of the virus. The Company considered the impact of COVID-19 on the assumptions and estimates used and determined that there were no material adverse impacts on the Company’s results of operations and financial position at December 31, 2020. The Company is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of the date of issuance of the financial statements. These estimates may change, as new events occur and additional information is obtained. Share-Based Compensation – We recognize share-based compensation of stock options granted based upon the fair value of options on the grant date using the Black-Scholes pricing model (see Note 15). Share-based compensation expense recognized during the period is based on the fair value of the portion of share-based payments awards that is ultimately expected to vest. Share-based compensation expense recognized in the consolidated statements of operations for the years ended December 31, 2020, 2019, and 2018 includes compensation expense based on the estimated grant date fair value for awards that are ultimately expected to vest, and accordingly has been reduced for estimated forfeitures. Estimated forfeitures at the time of grant are revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Fair Value – The carrying value of cash and cash equivalents, trade receivables, taxes receivable, accounts payable, accrued liabilities, and other liabilities approximate fair value due to the immediate or short-term maturity of these financial instruments. The fair value of variable rate long term debt and notes payable reflect recent market transactions and approximate carrying value. We used other observable inputs that would qualify as Level 2 inputs to make our assessment of the approximate fair value of our cash and cash equivalents, trade receivables, taxes receivable, accounts payable, accrued liabilities, other liabilities, notes payable and variable rate long term debt. We measure fair value by ASC Topic 820 Fair Value. ASC Topic 820 defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements. ASC Topic 820 applies to reported balances that are required or permitted to be measured at fair value under existing accounting pronouncements; accordingly, the standard amends numerous accounting pronouncements but does not require any new fair value measurements of reported balances. ASC Topic 820 emphasizes that fair value, among other things, is based on exit price versus entry price, should include assumptions about risk such as nonperformance risk in liability fair values, and is a market-based measurement, not an entity-specific measurement. When considering the assumptions that market participants would use in pricing the asset or liability, ASC Topic 820 establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity’s own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). The fair value hierarchy prioritizes inputs used to measure fair value into three broad levels. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. Income Taxes – Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company maintains a valuation allowance for a deferred tax asset when it is deemed to be more likely than not that some or all of the deferred tax asset will not be realized. Our estimate of the potential outcome of any uncertain tax issues is subject to management’s assessment of relevant risks, facts, and circumstances existing at that time. We use a more likely than not threshold for financial statement recognition and measurement of tax position taken or expected to be taken in a tax return. To the extent that our assessment of such tax position changes, the change in estimate is recorded in the period in which the determination is made. We report tax-related interest and penalties as a component of income tax expense. Subsequent Events – The Company has evaluated subsequent events through March 9, 2021, the date that the Consolidated Financial Statements were approved by management. Recently Adopted Accounting Pronouncements Effective January 1, 2020, we adopted Financial Accounting Standard Board (“FASB”) Accounting Standards Update (“ASU”) 2016-13, Measurement of Credit Losses on Financial Instruments, which changed the way entities recognize impairment of most financial assets. Short-term and long-term financial assets, as defined by the standard, are impacted by immediate recognition of estimated credit losses in the financial statements, reflecting the net amount expected to be collected. The adoption of this standard did not have a material impact on our Consolidated Financial Statements. Recent Accounting Pronouncements Not Yet Adopted In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (ASU 2019-12), which simplifies the accounting for income taxes. This guidance will be effective for us in the first quarter of 2021 on a prospective basis, and early adoption is permitted. The Company does not expect that the adoption of this guidance will have a material impact on our Consolidated Financial Statements. In March 2020, the FASB issued ASU No. 2020–04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting (ASU 2020-04), which provides guidance to alleviate the burden in accounting for reference rate reform by allowing certain expedients and exceptions in applying generally accepted accounting principles to contracts, hedging relationships, and other transactions impacted by reference rate reform. The provisions of ASU 2020-04 apply only to those transactions that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. This guidance is effective from March 12, 2020 through December 31, 2022 and adoption is optional. We are currently evaluating the impact of ASU 2020-04 on our Consolidated Financial Statements.

CONCENTRATIONS OF REVENUES AND

CONCENTRATIONS OF REVENUES AND CREDIT RISK	12 Months Ended
	Dec. 31, 2020
Risks and Uncertainties [Abstract]
CONCENTRATIONS OF REVENUES AND CREDIT RISK	CONCENTRATIONS OF REVENUES AND CREDIT RISK We sell our products and services to companies in the chemical, plastics, and petroleum industries. We perform periodic credit evaluations of our customers and generally do not require collateral from our customers. For the years ended December 31, 2020, 2019, and 2018, one customer accounted for 15.4%, 15.0%, and 13.5%, respectively, of consolidated revenue. The associated accounts receivable balances for this customer, ExxonMobil and their affiliates, were approximately $4.1 million and $4.9 million at December 31, 2020 and 2019, respectively. We market our products in many foreign jurisdictions. For the years ended December 31, 2020, 2019, and 2018, revenue in foreign jurisdictions accounted for approximately 24.0%, 21.9%, and 25.5% of consolidated revenue, respectively. SHR utilizes one major supplier to purchase all our feedstock supply. The feedstock is a commodity product commonly available from other suppliers if needed. At December 31, 2020, and 2019, we owed the supplier approximately $9.2 million and $12.4 million, respectively, for feedstock purchases. We hold our cash with various financial institutions that are insured by the Federal Deposit Insurance Corporation up to $250,000. At times during the year, cash balances may exceed this limit. We have not experienced any losses in such accounts and do not believe we are exposed to any significant risk of loss related to cash.

TRADE RECEIVABLES

TRADE RECEIVABLES	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
TRADE RECEIVABLES	TRADE RECEIVABLES Trade receivables, net, at December 31, consisted of the following: 2020 2019 (thousands of dollars) Trade receivables $ 25,601 $ 26,749 Less allowance for doubtful accounts (300) (429) Trade receivables, net $ 25,301 $ 26,320 Accounts receivable serves as collateral for our amended and restated loan agreement with a domestic bank (see Note 13).

INVENTORIES

INVENTORIES	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Inventories include the following at December 31: 2020 2019 (thousands of dollars) Raw material $ 2,580 $ 2,100 Work in process 138 142 Finished products 10,227 11,382 Total inventory $ 12,945 $ 13,624 Inventory serves as collateral for our amended and restated loan agreement with a domestic bank (see Note 13). Inventory included products in transit valued at approximately $3.6 million and $2.9 million at December 31, 2020 and 2019, respectively.

INVESTMENT IN AMAK AND DISCONTI

INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS	12 Months Ended
	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS	INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS On September 28, 2020, the Company completed the final closing of the previously disclosed sale of its ownership interest in AMAK (the “Share Sale”) to AMAK and certain existing shareholders of AMAK and their assignees (collectively, the “Purchasers”). The Share Sale was completed in multiple closings pursuant to a Share Sale and Purchase Agreement, dated September 22, 2019 (which we refer to herein as the “Purchase Agreement”), among the Company, AMAK, and other Purchasers and resulted in aggregate gross proceeds to the Company of Saudi Riyals (“SAR”) 265 million (approximately $70 million) (before taxes and expenses). As of December 31, 2019, the Company had a non-controlling equity interest of 33.3% in AMAK of approximately $32.9 million. As a condition to the effectiveness of the Purchase Agreement, the Purchasers advanced 5% of the purchase price (or approximately $3.5 million) in the form of a non-refundable deposit. Pursuant to the Purchase Agreement, (i) with respect to any Purchaser that completed the purchase of all or a portion of the ordinary shares allotted to it under the Purchase Agreement on or before March 31, 2020, the non-refundable deposit paid by such Purchaser (or a portion of such deposit for a partial closing) was credited toward the purchase price of the ordinary shares being purchased and (ii) with respect to any Purchasers that complete the purchase of all or a portion of their allotted ordinary shares after March 31, 2020 but on or before September 28, 2020, an amount equal to 50% of the non-refundable deposit paid by such Purchasers was forfeited to the Company as liquidated damages and such amount was not applied to the purchase price paid by the applicable Purchaser. On March 26, 2020, the Company and one Purchaser completed the first closing of the Share Sale (the “First Closing”). In connection with the First Closing, the Company sold 4,000,000 ordinary shares for aggregate gross proceeds (before taxes and transaction expenses) of SAR 40 million (or approximately $10.7 million) (inclusive of the full amount of the Purchaser’s non-refundable deposit previously paid of $0.5 million). The Company recorded a foreign tax payable of approximately $0.3 million related to the First Closing. During the third quarter of 2020, the Company completed additional closings of the Share Sale with respect to its remaining ownership interest in AMAK. In connection with these closings, the Company sold a total of 22,467,422 ordinary shares for aggregate gross proceeds (before taxes and transaction expenses) of SAR 224 million (or approximately $59.9 million) (inclusive of $1.5 million which constituted 50% of the non-refundable deposits previously paid by certain Purchasers). As none of the third quarter 2020 closings were completed prior to March 31, 2020, the remaining portion of the initial deposits (approximately $1.5 million) were forfeited to the Company as liquidated damages and were not applied to the purchase price. These amounts are included in income from discontinued operations, net of tax. The Company recorded a foreign tax payable of approximately $1.1 million related to the third quarter 2020 closings. In connection with the completion of the Share Sale, the Company and AMAK entered into an agreement whereby AMAK agreed to withhold approximately $2.1 million of the purchase price to pay the Company’s estimated tax obligations in Saudi Arabia. The Company is in the process of finalizing and filing the necessary tax returns in the Kingdom of Saudi Arabia. Upon payment, the Company will have a foreign tax credit which can be used to offset U.S. taxes. As of December 31, 2020, approximately $0.2 million of foreign taxes have been paid. The remaining funds withheld by AMAK are included in prepaid expenses and other assets on the Company’s consolidated balance sheets as of December 31, 2020. Subsequent to December 31, 2020, the Company instructed AMAK to pay approximately $1.1 million of the accrued foreign tax payable from the amount held by AMAK to cover the Company’s tax obligations in Saudi Arabia. As previously disclosed, and as a result of the Company’s investment in AMAK, the Company was required to execute a limited guarantee on October 24, 2010 (the “Guarantee”) of up to 41% of a loan (the “Loan”) by the Saudi Industrial Development Fund (“SIDF”) to AMAK to fund the construction of the AMAK facilities and to provide working capital needs. The provision of personal or corporate guarantees, as applicable, by each shareholder of AMAK was a condition to SIDF providing the Loan. Pursuant to the Purchase Agreement, the Purchasers (other than AMAK) agreed, upon the completion of the Share Sale, to assume the Company’s obligation under the Guarantee (proportionately based upon such Purchaser’s percentage acquisition of ordinary shares in the Share Sale). While a formal written release of the Company from the Guarantee was not obtained from SIDF prior to closing, the Company believes that the Purchasers’ assumption of the Company’s obligation under the Guarantee effectively eliminates the Company’s liability arising under the Guarantee. Included in discontinued operations are the following: Years Ended December 31, 2020 2019 2018 (thousands of dollars) Saudi administration and transaction expenses $ (2,452) $ (187) $ 136 Equity in earnings (losses) of AMAK 702 (986) (901) Gain (loss) on sale of equity interest 34,926 (1,473) — Income (loss) from discontinued operations before taxes 33,176 (2,646) (765) Tax (expense) benefit (6,967) 556 161 Income (loss) from discontinued operations, net of tax $ 26,209 $ (2,090) $ (604) AMAK’s financial statements were prepared in the functional currency of AMAK which is the SAR. In June 1986 the SAR was officially pegged to the U. S. Dollar at a fixed exchange rate of 1 USD to 3.75 SAR. The summarized results of operations and financial position for AMAK are as follows: Results of Operations Nine Months Ended September 30, Year Ended December 31, 2020 2019 2018 (thousands of dollars) Sales $ 62,633 $ 78,350 $ 70,234 Cost of sales (55,728) (69,620) (68,084) Gross profit 6,905 8,730 2,150 Selling, general, and administrative (4,985) (13,047) (7,860) Operating income (loss) 1,920 (4,317) (5,710) Other (expense) income (346) 558 86 Finance and interest expense (1,211) (1,450) (1,592) Income (loss) before Zakat and income taxes 363 (5,209) (7,216) Zakat and income tax (expense) benefit (490) (1,801) 487 Net loss $ (127) $ (7,010) $ (6,729) Financial Position September 30, December 31, 2020 2019 (thousands of dollars) Current assets $ 29,799 $ 45,354 Noncurrent assets 209,814 196,564 Total assets $ 239,613 $ 241,918 Current liabilities $ 40,919 $ 27,645 Long term liabilities 79,122 79,348 Stockholders' equity 119,572 134,925 $ 239,613 $ 241,918 The equity in the earnings (losses) of AMAK included in income (loss) from discontinued operations, net of tax, on the consolidated statements of operations for the years ended December 31, 2020, 2019, and 2018, is comprised of the following: Nine Months Ended September 30, Year Ended December 31, 2020 2019 2018 (thousands of dollars) AMAK Net Loss (127) (7,010) (6,729) Company’s share of loss reported by AMAK (308) * (1,996) (2,248) Amortization of difference between Company’s investment in AMAK and Company’s share of net assets of AMAK 1,010 1,010 1,347 Equity in earnings (losses) of AMAK 702 (986) (901) * Percentage of Ownership varies during the period.

PREPAID EXPENSES AND OTHER ASSE

PREPAID EXPENSES AND OTHER ASSETS	12 Months Ended
	Dec. 31, 2020
Prepaid Expense and Other Assets, Current [Abstract]
PREPAID EXPENSES AND OTHER ASSETS	PREPAID EXPENSES AND OTHER ASSETS Prepaid expenses and other assets at December 31 are summarized as follows: 2020 2019 (thousands of dollars) Prepaid license $ 403 $ 1,209 Prepaid insurance 4,241 — Spare parts 2,376 1,857 Insurance receivable — 1,148 Cash held by AMAK (see Note 6) 1,877 — Other prepaid expenses and assets 301 733 Total $ 9,198 $ 4,947

PLANT, PIPELINE AND EQUIPMENT

PLANT, PIPELINE AND EQUIPMENT	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
PLANT, PIPELINE AND EQUIPMENT	PLANT, PIPELINE AND EQUIPMENT Plant, pipeline and equipment include the following at December 31: 2020 2019 (thousands of dollars) Platinum catalyst $ 1,580 $ 1,580 Catalyst 4,325 4,095 Land 5,428 5,428 Plant, pipeline and equipment 270,149 258,651 Construction in progress 6,422 5,052 Total plant, pipeline and equipment 287,904 274,806 Less accumulated depreciation (100,800) (85,887) Net plant, pipeline and equipment $ 187,104 $ 188,919 Plant, pipeline and equipment serve as collateral for our amended and restated loan agreement with a domestic bank (see Note 13). Interest capitalized for construction for 2020, 2019 and 2018 was approximately nil, nil and $0.7 million, respectively. Labor capitalized for construction for 2020, 2019 and 2018 was approximately $0.6 million, $0.0 million and $2.3 million, respectively. Catalyst amortization relating to the platinum catalyst which is included in cost of sales was approximately $1.2 million, $1.3 million and $0.1 million for 2020, 2019 and 2018, respectively.

LEASES

LEASES	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
LEASES	LEASES The components of lease expense were as follows: December 31, ($ in thousands) Classification in the Consolidated Statements of Operations 2020 2019 2018 Operating lease cost (a) Cost of sales, exclusive of depreciation and amortization $ 4,088 $ 4,361 $ — Operating lease cost (a) Selling, general and administrative 137 137 — Total operating lease cost $ 4,225 $ 4,498 $ — Finance lease cost: Amortization of right-of-use assets Depreciation — — — Interest on lease liabilities Interest Expense — — — Total finance lease cost $ — $ — $ — Total lease cost $ 4,225 $ 4,498 $ — (a) Short-term lease costs were approximately $0.5 million, $0.1 million and nil as of December 31, 2020, 2019 and 2018, respectively. The Company had no variable lease expense during the period. December 31, ($ in thousands) Classification on the Consolidated Balance Sheets 2020 2019 Assets: Operating Operating lease assets $ 10,528 $ 13,512 Finance Property, plant, and equipment — — Total leased assets $ 10,528 $ 13,512 Liabilities: Current Operating Current portion of operating lease liabilities $ 3,195 $ 3,174 Finance Short-term debt and current portion of long-term debt — — Noncurrent Operating Operating lease liabilities 7,333 10,338 Finance Long-term debt — — Total lease liabilities $ 10,528 $ 13,512 December 31, ($ in thousands) 2020 2019 2018 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 3,713 $ 4,389 $ — Operating cash flows used for finance leases — — — Financing cash flows used for finance leases — — — Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 206 $ 81 $ — Finance leases — — — December 31, 2020 2019 Weighted-average remaining lease term (in years): Operating leases 3.7 4.5 Finance leases 0.0 0.0 Weighted-average discount rate: Operating leases 4.5 % 4.5 % Finance leases — % — % Nearly all of the Company’s lease contracts do not provide a readily determinable implicit rate. For these contracts, the Company’s estimated incremental borrowing rate is based on information available at the inception of the lease. As of December 31, 2020, maturities of lease liabilities were as follows: ($ in thousands) Operating Leases Finance Leases 2020 $ 3,590 $ — 2021 3,268 — 2022 2,376 — 2023 1,062 — 2024 991 — Thereafter 117 — Total lease payments $ 11,404 $ — Less: Interest 876 — Total lease obligations $ 10,528 $ —
LEASES	LEASES The components of lease expense were as follows: December 31, ($ in thousands) Classification in the Consolidated Statements of Operations 2020 2019 2018 Operating lease cost (a) Cost of sales, exclusive of depreciation and amortization $ 4,088 $ 4,361 $ — Operating lease cost (a) Selling, general and administrative 137 137 — Total operating lease cost $ 4,225 $ 4,498 $ — Finance lease cost: Amortization of right-of-use assets Depreciation — — — Interest on lease liabilities Interest Expense — — — Total finance lease cost $ — $ — $ — Total lease cost $ 4,225 $ 4,498 $ — (a) Short-term lease costs were approximately $0.5 million, $0.1 million and nil as of December 31, 2020, 2019 and 2018, respectively. The Company had no variable lease expense during the period. December 31, ($ in thousands) Classification on the Consolidated Balance Sheets 2020 2019 Assets: Operating Operating lease assets $ 10,528 $ 13,512 Finance Property, plant, and equipment — — Total leased assets $ 10,528 $ 13,512 Liabilities: Current Operating Current portion of operating lease liabilities $ 3,195 $ 3,174 Finance Short-term debt and current portion of long-term debt — — Noncurrent Operating Operating lease liabilities 7,333 10,338 Finance Long-term debt — — Total lease liabilities $ 10,528 $ 13,512 December 31, ($ in thousands) 2020 2019 2018 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 3,713 $ 4,389 $ — Operating cash flows used for finance leases — — — Financing cash flows used for finance leases — — — Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 206 $ 81 $ — Finance leases — — — December 31, 2020 2019 Weighted-average remaining lease term (in years): Operating leases 3.7 4.5 Finance leases 0.0 0.0 Weighted-average discount rate: Operating leases 4.5 % 4.5 % Finance leases — % — % Nearly all of the Company’s lease contracts do not provide a readily determinable implicit rate. For these contracts, the Company’s estimated incremental borrowing rate is based on information available at the inception of the lease. As of December 31, 2020, maturities of lease liabilities were as follows: ($ in thousands) Operating Leases Finance Leases 2020 $ 3,590 $ — 2021 3,268 — 2022 2,376 — 2023 1,062 — 2024 991 — Thereafter 117 — Total lease payments $ 11,404 $ — Less: Interest 876 — Total lease obligations $ 10,528 $ —

GOODWILL AND INTANGIBLE ASSETS,

GOODWILL AND INTANGIBLE ASSETS, NET	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLE ASSETS, NET	GOODWILL AND INTANGIBLE ASSETS, NET Goodwill We evaluated our goodwill for impairment during the fourth quarter of 2019 in connection with our annual review. As part of our review, we assessed 2019 operating performance and its impact on the operating cash flows of our Specialty Waxes reporting unit. We concluded based on this analysis that the estimates of fair value of our Specialty Waxes reporting unit was lower than its book value, including goodwill. As a result, we recorded a non-cash impairment charge of $24.2 million in 2019, representing all of the the goodwill previously allocated to this reporting unit. Intangible Assets The following table summarizes the gross carrying amounts and accumulated amortization of intangible assets by major class (in thousands): December 31, 2020 Intangible assets subject to amortization Gross Accumulated Net Customer relationships $ 16,852 $ (7,022) $ 9,830 Non-compete agreements 94 (94) — Licenses and permits 1,471 (707) 764 Developed technology 6,131 (3,832) 2,299 Total $ 24,548 $ (11,655) $ 12,893 December 31, 2019 Intangible assets subject to amortization Gross Accumulated Net Customer relationships $ 16,852 $ (5,898) $ 10,954 Non-compete agreements 94 (94) — Licenses and permits 1,471 (601) 870 Developed technology 6,131 (3,219) 2,912 Total $ 24,548 $ (9,812) $ 14,736 Amortization expense for intangible assets included in cost of sales for the years ended December 31, 2020, 2019, and 2018, was approximately $1.8 million, $1.9 million, and $1.9 million respectively. Based on identified intangible assets that are subject to amortization as of December 31, 2020, we expect future amortization expenses for each period to be as follows (in thousands): Total 2021 2022 2023 2024 2025 Thereafter Customer relationships $ 9,830 $ 1,123 $ 1,123 $ 1,123 $ 1,123 $ 1,123 $ 4,215 Licenses and permits 764 101 86 86 86 86 319 Developed technology 2,299 613 613 613 460 — — Total future amortization expense $ 12,893 $ 1,837 $ 1,822 $ 1,822 $ 1,669 $ 1,209 $ 4,534

MINERAL PROPERTIES IN THE UNITE

MINERAL PROPERTIES IN THE UNITED STATES	12 Months Ended
	Dec. 31, 2020
Mineral Industries Disclosures [Abstract]
MINERAL PROPERTIES IN THE UNITED STATES	MINERAL PROPERTIES IN THE UNITED STATESThe principal assets of PEVM are an undivided interest in 48 patented and 5 unpatented mining claims totaling approximately 1,500 acres in southeast Nevada. The properties held by PEVM have not been commercially operated for approximately 35 years. In November 2019, PEVM entered into a sales contract which, upon completion of due diligence, may lead to liquidation of substantially all of its remaining assets. Upon closing of the sale, PEVM will be dissolved. Any proceeds from the sale will be used to repay outstanding indebtedness of PEVM owed to the Company. In accordance with the sales contract, in September 2020, approximately $0.2 million of the deposit became non-refundable. The closing of the sale and receipt of remaining proceeds is expected to be completed in late 2021. The sale of PEVM is not anticipated to have a material impact on the Company's Consolidated Financial Statements.

ACCRUED LIABILITIES

ACCRUED LIABILITIES	12 Months Ended
	Dec. 31, 2020
Accrued Liabilities [Abstract]
ACCRUED LIABILITIES	ACCRUED LIABILITIES Accrued liabilities at December 31 are summarized as follows: 2020 2019 (thousands of dollars) Accrued state taxes $ 125 $ — Accrued payroll 2,282 1,250 Accrued royalties 260 273 Accrued officer compensation 1,053 1,687 Accrued professional expenses 559 1,000 Accrued foreign taxes 1,054 — Other liabilities 1,524 1,532 Total $ 6,857 $ 5,742

LONG-TERM DEBT AND LONG-TERM OB

LONG-TERM DEBT AND LONG-TERM OBLIGATIONS	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
LONG-TERM DEBT AND LONG-TERM OBLIGATIONS	LONG-TERM DEBT AND LONG-TERM OBLIGATIONS Senior Secured Credit Facilities As of December 31, 2020, the Company had (i) no outstanding borrowings under the senior secured revolving credit facility (the “Revolving Facility”) and (ii) approximately $46.6 million in borrowings outstanding under the senior secured term loan facility (the “Term Loan Facility” and, together with the Revolving Facility, the “Credit Facilities”), in each case, provided by the amended and restated credit agreement, dated as of October 1, 2014 (as amended, the “ARC Agreement”), entered into by TOCCO, SHR, GSPL and TC (SHR, GSPL and TC collectively the “Guarantors”). As of December 31, 2020, the Company had approximately $52.4 million of availability under our Revolving Facility (which has aggregate commitments of $75.0 million under the ARC Agreement). TOCCO’s ability to make additional borrowings under the Revolving Facility at December 31, 2020 was limited by, and in the future may be limited by, the Company’s obligation to maintain compliance with the covenants contained in the ARC Agreement (including maintenance of a maximum Consolidated Leverage Ratio and minimum Consolidated Fixed Charge Coverage Ratio (each as defined in the ARC Agreement)). The maturity date for the ARC Agreement is July 31, 2023. Subject to the lenders acceptance of any increased commitment and other conditions, TOCCO has the option, at any time, to request an increase to the commitment under the Revolving Facility and/or the Term Loan Facility by an additional amount of up to $50.0 million in the aggregate. Borrowings under each of the Credit Facilities bear interest on the outstanding principal amount at a rate equal to LIBOR plus an applicable margin of 1.25% to 2.50% or, at our option, the Base Rate plus an applicable margin of 0.25% to 1.50%, in each case, with the applicable margin being determined based on the Consolidated Leverage Ratio of TOCCO. A commitment fee between 0.20% and 0.375% is also payable quarterly on the unused portion of the Revolving Facility. As of December 31, 2020, the year to date effective interest rate for the Credit Facilities was 2.63%. Borrowings under the Term Loan Facility are subject to quarterly amortization payments based on a commercial style amortization method over a twenty year period; provided, that the final principal installment will be paid on the maturity date and will be in an amount equal to the outstanding borrowings under the Term Loan Facility on such date. On May 8, 2020, TOCCO and the Guarantors entered into a Seventh Amendment to the ARC Agreement. Pursuant to the Seventh Amendment, certain amendments were made to the terms of the ARC Agreement, including, among other things, to (a) permit the incurrence of additional indebtedness in the form of loans (the “PPP Loans”) under the United States Small Business Administration Paycheck Protection Program (the “PPP”) and (b) exclude the PPP Loans from the calculation of the Consolidated Leverage Ratio until such time that any portion of the PPP Loans are not forgiven in accordance with the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”). As of the end of each fiscal quarter, TOCCO must maintain a maximum Consolidated Leverage Ratio of 3.50 to 1.00 (subject to temporary increase following certain acquisitions). TOCCO’s Consolidated Leverage Ratio was 1.65 and 2.20 as of December 31, 2020 and December 31, 2019, respectively. Additionally, TOCCO must maintain a minimum Consolidated Fixed Charge Coverage Ratio as of the end of any fiscal quarter of 1.15 to 1.00. TOCCO’s Consolidated Fixed Charge Coverage Ratio was 1.80 and 2.56 as of December 31, 2020 and December 31, 2019, respectively. As noted above, the Consolidated Leverage Ratio specifically excludes the PPP Loans until such time that any portion of the PPP Loans are not forgiven in accordance with the CARES Act. The Company used a portion of the approximately $60 million in net proceeds from the Share Sale, discussed in Note 6, to prepay outstanding borrowings of $30 million under the Term Loan Facility of the Company’s ARC Agreement in September 2020. The ARC Agreement contains a number of customary affirmative and negative covenants and the Company was in compliance with those covenants as of December 31, 2020. Debt Issuance Costs Debt issuance costs of approximately $0.9 million were incurred in connection with the fourth amendment to the ARC Agreement and the remaining debt issuance costs of $0.3 million from the previous agreements were expensed and are shown as a loss on the extinguishment of debt on the consolidated statements of operations for the year ended December 31, 2018. Unamortized debt issuance costs of approximately $0.5 million and $0.6 million for the years ended December 31, 2020 and December 31, 2019, have been netted against outstanding loan balances. Long-term debt and long-term obligations at December 31 are summarized as follows: 2020 2019 (thousands of dollars) Revolving facility $ — $ 3,000 Term loan facility 46,563 80,938 Loan fees (468) (649) Total long-term debt 46,095 83,289 Less current portion including loan fees 4,194 4,194 Total long-term debt, less current portion including loan fees $ 41,901 $ 79,095 PPP Loans On May 6, 2020, SHR and TC (collectively, the “Borrowers”) received loan proceeds from the PPP Loans in an aggregate principal amount of approximately $6.1 million under the PPP. The PPP Loans are evidenced by unsecured promissory notes each payable to Bank of America, N.A. The Borrowers fully utilized the PPP Loans to cover payroll and benefits costs in accordance with the relevant terms and conditions of the CARES Act. The PPP Loans mature on May 6, 2022, and bear interest at a stated rate of 1.0% per annum. The Company is pursuing and expects to receive full forgiveness of the PPP Loans in accordance with the provisions of the CARES Act.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Litigation The Company is periodically named in legal actions arising from normal business activities. We evaluate the merits of these actions and, if we determine that an unfavorable outcome is probable and can be reasonably estimated, we will establish the necessary reserves. We are not currently involved in legal proceedings that could reasonably be expected to have a material adverse effect on our business, prospects, financial condition or results of operations. We may become involved in material legal proceedings in the future. Supplier Agreements In accordance with our supplier agreements, on a recurring monthly basis, the Company commits to purchasing a determined volume of feedstock in anticipation of upcoming requirements. Feedstock purchases are invoiced and recorded when they are delivered. As of December 31, 2020 and 2019, the value of the remaining undelivered feedstock approximated $9.2 million and $12.4 million, respectively. From time to time, we may incur shortfall fees due to feedstock purchases being below the minimum amounts as prescribed by our agreements with our suppliers. The shortfall fee expenses were $1.1 million, $0.6 million and $0.5 million for the years ended December 31, 2020, 2019, and 2018. Environmental Remediation Amounts charged to expense for various activities related to environmental monitoring, compliance, and improvements were approximately $0.9 million in 2020, $0.9 million in 2019 and $0.7 million in 2018.

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
SHARE-BASED COMPENSATION	SHARE-BASED COMPENSATION The Stock Option Plan for Key Employees, as well as, the Non-Employee Director Stock Option Plan (hereinafter collectively referred to as the “Stock Option Plans”), were approved by the Company’s shareholders in July 2008. The Stock Option Plans allot for the issuance of up to 1,000,000 shares. The Trecora Resources Stock and Incentive Plan (the “Plan”) was approved by the Company’s shareholders in June 2012. The Plan allows for the issuance of up to 2,500,000 shares in the form of stock options or restricted stock unit awards. Share-based compensation of approximately $1.9 million, $1.3 million, and $1.8 million was recognized in 2020, 2019, and 2018, respectively. The Company reclassified approximately $0.3 million and $0.3 million for 2019 and 2018, respectively, from share-based compensation expense in connection with the restructuring described in Note 21. Stock Options and Warrant Awards Stock options and warrants granted under the provisions of the Stock Option Plans permit the purchase of our common stock at exercise prices equal to the closing price of Company common stock on the date the options were granted. The options have terms of 10 years and generally vest ratably over terms of 4 to 5 years. There were no stock options or warrant awards issued during 2020, 2019, or 2018. A summary of the status of the Company’s stock option and warrant awards is as follows: Stock Options and Warrants Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Life Intrinsic Outstanding at January 1, 2020 487,000 $ 10.87 Granted — — Expired — — Exercised — — Forfeited — — Outstanding at December 31, 2020 487,000 $ 10.87 2.8 $ — Expected to vest — $ — 0.0 $ — Exercisable at December 31, 2020 487,000 $ 10.87 2.8 $ — The aggregate intrinsic value of options was calculated as the difference between the exercise price of the underlying awards and the quoted price of our common stock. At December 31, 2020, options to purchase approximately 0.1 million shares of common stock were in-the-money. Since no options were granted, the weighted average grant-date fair value per share of options granted during the years 2020, 2019, and 2018 was nil. During 2020, 2019, and 2018 the aggregate intrinsic value of options and warrants exercised was approximately nil, $0.1 million and $2.6 million respectively, determined as of the date of option exercise. The Company received approximately nil, nil and $0.9 million in cash from the exercise of options during 2020, 2019 and 2018, respectively. Of the 85,000 stock options and warrants exercised in 2019, the Company only issued approximately 11,000 shares due to cashless transactions. The tax benefit realized from the exercise in 2019 was insignificant. As of December 31, 2020, there was no unrecognized compensation costs related to non-vested share-based compensation. Post-retirement compensation of approximately $0.7 million during the year ended December 31, 2018 was reversed related to options awarded to a former CEO and board member in July 2009. On May 9, 2010, the Board of Directors determined that he had forfeited these options and other retirement benefits when he made various demands against the Company and other AMAK shareholders which would benefit him personally and were not in the best interests of the Company and its shareholders. The Company was successful in litigating its right to withdraw the options and benefits and as such, these options and benefits were reversed during the second quarter of 2018. Restricted Stock and Restricted Stock Unit Awards Generally, restricted stock and restricted stock unit awards are granted annually to officers and directors of the Company under the provisions of the Plan. Restricted stock units are also granted ad hoc to attract or retain key personnel, and the terms and conditions under which these restricted stock units vest vary by award. The fair market value of restricted stock units granted is equal to the Company’s closing stock price on the date of grant. Restricted stock units granted generally vest ratably over periods ranging from 1 to 3 years. Certain awards also include vesting provisions based on performance metrics. Upon vesting, the restricted stock units are settled by issuing one share of Company common stock per unit. A summary of the status of the Company’s restricted stock units activity is as follows: Shares of Restricted Stock Units Weighted Average Grant Date Price per Share Outstanding at January 1, 2020 298,864 $ 9.78 Granted 364,637 6.32 Forfeited (15,571) 11.40 Vested (71,409) 8.40 Outstanding at December 31, 2020 576,521 $ 7.51 Expected to vest 576,521 As of December 31, 2020, there was approximately $1.3 million of unrecognized compensation costs related to non-vested restricted share-based compensation that is expected to be recognized over a weighted average period of 1.1 years.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES On March 27, 2020, the CARES Act was enacted into law. The CARES Act allows for the deferral of income and social security tax payments, a five–year carryback for net operating losses (“NOLs”), changes to interest expense and business loss limitation rules, certain new tax credits, and certain new loans and grants to businesses. In connection with the CARES Act, we recognized $16.5 million in NOL carryback claims, of which approximately, $14.1 million was received during the fourth quarter of 2020. In connection with this claim, we received interest income of approximately $0.5 million which is included in miscellaneous income (expense). Our final refund claim for approximately $2.4 million is still outstanding and is included in taxes receivable on the consolidated balance sheet. The provision (benefit) for income taxes from continuing operations consisted of the following: Year ended December 31, 2020 2019 2018 (thousands of dollars) Current federal benefit $ (19,190) $ — $ (74) Current state expense 86 91 31 Deferred federal expense (benefit) 15,140 (3,564) (813) Deferred state expense (benefit) 1 (93) 210 Income tax expense (benefit) $ (3,963) $ (3,566) $ (646) The difference between the year ended effective tax rate in income tax expense (benefit) and the Federal statutory rate of 21% is as follows: 2020 2019 2018 (thousands of dollars) Income taxes at U.S. statutory rate $ 211 $ (3,455) $ (661) State taxes, net of federal benefit 71 256 234 Net operating loss carryback (4,655) — — Research and development credits (518) (203) (263) Permanent and other items 928 (164) 44 Total tax expense (benefit) $ (3,963) $ (3,566) $ (646) The significant difference in rate is primarily due to the ability of the Company under the CARES Act to carryback 2018 and 2019 NOLs to a year with a 35% income tax rate. Other permanent differences include the research and development credit, compensation limits, and stock-based compensation. Tax effects of temporary differences that give rise to significant portions of federal and state deferred tax assets and deferred tax liabilities were as follows: December 31, 2020 2019 (thousands of dollars) Deferred tax liabilities: Plant, pipeline and equipment $ (31,119) $ (29,227) Other assets (31) (32) Operating lease asset (2,211) (2,838) Total deferred tax liabilities $ (33,361) $ (32,097) Deferred tax assets: Net operating loss carryforward — 11,685 Intangible assets 3,396 3,699 Operating lease liability 2,211 2,838 Stock-based compensation 956 1,093 Investment in AMAK — 589 Accounts receivable 65 240 Mineral interests 226 226 Interest expense carryforward — 211 General business credit — 140 Inventory 146 111 Post-retirement benefits 70 71 Charitable contributions — 45 Gross deferred tax assets 7,070 20,948 Valuation allowance (226) (226) Total net deferred tax assets $ 6,844 $ 20,722 Net deferred tax liabilities $ (26,517) $ (11,375) We provided a valuation allowance in 2020 and 2019 against certain deferred tax assets because of uncertainties regarding their realization. In connection with the sale of AMAK, the Company recorded foreign tax expense, recognized as a foreign tax credit, of approximately $1.3 million (See Note 6) during the year ended December 31, 2020. We file an income tax return in the U.S. federal jurisdiction and a margin tax return in Texas. We received notification from the Internal Revenue Service (“IRS”) in February 2020 on the selection of our December 31, 2017 tax return for audit. All audit requests are complete and the Company is expecting to receive confirmation of the audit closing without change. In prior years, we received notification that Texas selected our R&D credit calculations for 2014 and 2015 for audit. The state of Texas had suspended their examination while they comprehensively reviewed their audit procedures for consistency. During the fourth quarter of 2019, we received notice that Texas had completed their review of their procedures and initiated additional requests for information. The Company has timely responded to all requested information. We do not expect any changes related to the Federal or Texas audits. Our federal and Texas tax returns remain open for examination for the years 2016 through 2020. We recognized no adjustment for uncertain tax positions. As of December 31, 2020, and 2019, no interest or penalties related to uncertain tax positions had been accrued.

SEGMENT INFORMATION

SEGMENT INFORMATION	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION We operate in two business segments: Specialty Petrochemicals and Specialty Waxes. We operate through business segments according to the nature and economic characteristics of our products as well as the manner in which the information is used internally by our key decision maker, who is our Chief Executive Officer. The accounting policies of the reporting segments are the same as those described in Note 2. Our Specialty Petrochemicals segment includes SHR and GSPL. Our Specialty Waxes segment includes TC. We also separately identify our corporate overhead which includes financing and administrative activities such as legal, accounting, consulting, investor relations, officer and director compensation, corporate insurance, and other administrative costs. Year Ended December 31, 2020 Specialty Petrochemicals Specialty Waxes Corporate Consolidated (in thousands) Net revenues $ 172,350 $ 36,276 $ — $ 208,626 Operating income (loss) before depreciation and amortization 26,438 1,762 (9,114) 19,086 Operating income (loss) 15,827 (3,760) (9,129) 2,938 Income (loss) from continuing operations before taxes 13,294 (3,606) (8,685) 1,003 Depreciation and amortization 10,611 5,522 16 16,149 Capital expenditures 11,334 2,017 — 13,351 Year Ended December 31, 2020 Specialty Petrochemicals Specialty Waxes Corporate Eliminations Consolidated (in thousands) Intangible assets, net $ — $ 12,893 $ — $ — $ 12,893 Total assets 298,198 83,108 127,260 (191,733) 316,833 Year Ended December 31, 2019 Specialty Petrochemicals Specialty Waxes Corporate Consolidated (in thousands) Net revenues $ 224,311 $ 34,648 $ — $ 258,959 Operating income (loss) before depreciation and amortization 38,860 (24,333) (9,190) 5,337 Operating income (loss) 28,304 (29,925) (9,242) (10,863) Income (loss) from continuing operations before taxes 23,993 (31,164) (9,279) (16,450) Depreciation and amortization 10,556 5,593 52 16,201 Capital expenditures 6,955 3,124 — 10,079 Year Ended December 31, 2019 Specialty Petrochemicals Specialty Waxes Corporate Eliminations Consolidated (in thousands) Intangible assets, net $ — $ 14,736 $ — $ — $ 14,736 Total assets 289,546 88,245 90,203 (166,175) 301,819

NET INCOME (LOSS) PER COMMON SH

NET INCOME (LOSS) PER COMMON SHARE	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
NET INCOME (LOSS) PER COMMON SHARE	NET INCOME (LOSS) PER COMMON SHARE Year ended December 31, 2020 2019 2018 (thousands of dollars, except per share amounts) Net Income per Common Share - Continuing Operations Net income (loss) from continuing operations $ 4,966 $ (12,884) $ (1,728) Basic income (loss) from continuing operations per common share: Weighted average shares outstanding 24,802 24,698 24,438 Per share amount (dollars) $ 0.20 $ (0.52) $ (0.07) Diluted income (loss) from continuing operations per common share: Weighted average shares outstanding 25,356 24,698 24,438 Per share amount (dollars) $ 0.20 $ (0.52) $ (0.07) Weighted average shares-denominator 24,802 24,698 24,438 Unvested restricted stock unit grant 554 — — Weighted average shares, as adjusted 25,356 24,698 24,438 Net Income per Common Share - Discontinued Operations Net income (loss) from discontinued operations $ 26,209 $ (2,090) $ (604) Basic income (loss) from discontinued operations per common share: Weighted average shares outstanding 24,802 24,698 24,438 Per share amount (dollars) $ 1.06 $ (0.08) $ (0.02) Diluted income (loss) from discontinued operations per common share: Weighted average shares outstanding 25,356 24,698 24,438 Per share amount (dollars) $ 1.03 $ (0.08) $ (0.02) Weighted average shares-denominator 24,802 24,698 24,438 Unvested restricted stock unit grant 554 — — Weighted average shares, as adjusted 25,356 24,698 24,438 Net Income per Common Share Net income (loss) $ 31,175 $ (14,974) $ (2,332) Basic income (loss) per common share: Weighted average shares outstanding 24,802 24,698 24,438 Per share amount (dollars) $ 1.26 $ (0.61) $ (0.10) Diluted income (loss) per common share: Weighted average shares outstanding 25,356 24,698 24,438 Per share amount (dollars) $ 1.23 $ (0.61) $ (0.10) Weighted average shares-denominator 24,802 24,698 24,438 Unvested restricted stock unit grant 554 — — Effect of dilutive stock options — — — Weighted average shares, as adjusted 25,356 24,698 24,438 At December 31, 2020, 2019, and 2018, 0.5 million, 0.5 million and 0.7 million potential common stock shares, respectively, were issuable upon the exercise of options and warrants. At December 31, 2020, the Company had 0.5 million stock options that were not included in the computation of diluted earnings per share because such options would be anti-dilutive.

QUARTERLY RESULTS OF OPERATIONS

QUARTERLY RESULTS OF OPERATIONS (UNAUDITED)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
QUARTERLY RESULTS OF OPERATIONS (UNAUDITED)	QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) The quarterly results of operations shown below are derived from unaudited financial statements for the eight quarters ended December 31, 2020 (in thousands, except per share data, rounding may apply): Year Ended December 31, 2020 First Quarter Second Quarter Third Quarter Fourth Quarter Total Revenues $ 62,067 $ 40,674 $ 47,747 $ 58,138 $ 208,626 Gross profit 8,078 6,167 8,457 5,976 28,678 Net income (loss) from continuing operations $ 5,863 $ (1,859) $ 1,108 $ (146) $ 4,966 Net income (loss) from discontinued operations, net of tax 4,857 (2) 21,324 30 26,209 Net income (loss) 10,720 (1,861) 22,432 (116) 31,175 Basic EPS (1) from continuing operations $ 0.24 $ (0.07) $ 0.04 $ (0.01) $ 0.20 Basic EPS (1) from discontinued operations 0.20 — 0.86 — 1.06 Basic EPS (1) 0.44 (0.07) 0.90 (0.01) 1.26 Diluted EPS (1) from continuing operations $ 0.23 $ (0.07) $ 0.04 $ (0.01) $ 0.20 Diluted EPS (1) from discontinued operations 0.19 — 0.84 — 1.03 Diluted EPS (1) 0.42 (0.07) 0.88 (0.01) 1.23 Year Ended December 31, 2019 First Quarter Second Quarter Third Quarter Fourth Quarter Total Revenues $ 65,155 $ 69,371 $ 62,715 $ 61,718 $ 258,959 Gross profit 10,073 10,565 9,567 8,310 38,515 Net income (loss) from continuing operations $ 1,797 $ 2,476 $ 1,583 $ (18,740) $ (12,884) Net income (loss) from discontinued operations, net of tax (46) (72) (1,002) (970) (2,090) Net income (loss) 1,751 2,404 581 (19,710) (14,974) Basic EPS (1) from continuing operations $ 0.07 $ 0.10 $ 0.06 $ (0.76) $ (0.52) Basic EPS (1) from discontinued operations — — (0.04) (0.04) (0.08) Basic EPS (1) 0.07 0.10 0.02 (0.80) (0.61) Diluted EPS (1) from continuing operations $ 0.07 $ 0.10 $ 0.06 $ (0.76) $ (0.52) Diluted EPS (1) from discontinued operations — — (0.04) (0.04) (0.08) Diluted EPS (1) 0.07 0.10 0.02 (0.80) (0.61) (1) Basic and diluted earnings per share are computed independently for each of the quarters presented based on the weighted average number of common shares outstanding during that period. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted earnings per share.

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONSIn November 2020, Company Director Adam C. Peakes joined Merichem Company as Executive Vice President and Chief Financial Officer. The Company incurred expenses of less than $0.1 million during each of the years ended December 31, 2020, 2019, and 2018, respectively, for Merichem Company. At December 31, 2020 and 2019, we had outstanding liabilities payable to Merichem Company of less than $0.1 million and nil, respectively.Consulting fees of approximately nil , $0.1 million and $0.1 million were incurred during 2020, 2019, and 2018, respectively, from Nicholas Carter, Director and former CEO. Due to his history and experience with the Company and to provide continuity after his retirement, a consulting agreement was entered into with Mr. Carter in July 2015, which terminated effective December 31, 2019.

RESTRUCTURING AND SEVERANCE EXP

RESTRUCTURING AND SEVERANCE EXPENSES	12 Months Ended
	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
RESTRUCTURING AND SEVERANCE EXPENSES	RESTRUCTURING AND SEVERANCE EXPENSESDuring 2018, the Company incurred restructuring and severance expenses of approximately $2.3 million related to changes in executive management and the completion of significant capital projects in our specialty petrochemicals segment. These expenses related to severance, stock compensation for continued vesting of time-vested shares issued under the Company’s long-term incentive plans, and certain employee benefits including medical insurance and vacation. As of December 31, 2020, there was no remaining unpaid or accrued restructuring or severance expenses. As of December 31, 2019, approximately $0.02 million remained unpaid and was included in accrued liabilities.

POST-RETIREMENT OBLIGATIONS

POST-RETIREMENT OBLIGATIONS	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
POST-RETIREMENT OBLIGATIONS	POST-RETIREMENT OBLIGATIONSIn July 2015 and June 2018, we entered into retirement agreements with our former CEO, Nicholas Carter, and our former VP of Accounting & Compliance, Connie Cook. Mr. Carter’s agreement provides continued welfare benefits for him and his wife for life at the same cost sharing basis as regular employees. Ms. Cook’s agreement provides continued welfare benefits for her and her husband until eligible for Medicare. Approximately $0.3 million and $0.3 million was outstanding at December 31, 2020, and 2019, respectively, and included in post-retirement benefits. For the period ended December 31, 2020, and 2019, approximately $0.01 million and $0.02 million, respectively, had been paid.

VALUATION AND QUALIFYING ACCOUN

VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
VALUATION AND QUALIFYING ACCOUNTS	TRECORA RESOURCES AND SUBSIDIARIES VALUATION AND QUALIFYING ACCOUNTS Three years ended December 31, 2020 Description Beginning Charged Deductions Ending ALLOWANCE FOR DEFERRED December 31, 2018 225,622 — — 225,622 December 31, 2019 225,622 — — 225,622 December 31, 2020 225,622 — — 225,622 Description Beginning Charged Deductions Ending ALLOWANCE FOR DOUBTFUL December 31, 2018 300,000 152,000 — 452,000 December 31, 2019 452,000 (23,000) — 429,000 December 31, 2020 429,000 — (129,000) 300,000

AMAK FINANCIAL STATEMENTS

AMAK FINANCIAL STATEMENTS	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
FINANCIAL STATEMENTS	AL MASANE AL KOBRA MINING COMPANY Balance Sheets September 30, December 31, 2020 2019 (Expressed in Saudi Riyals) ASSETS Current assets: Cash and cash equivalents 29,452,821 52,244,794 Restricted cash (Note 1) 7,935,905 — Accounts receivable, net 8,688,925 29,643,472 Inventories 45,017,824 35,277,340 Advances to shareholders (Note 1) — 2,859,341 Advances to contractors and other 20,650,315 50,053,018 Total current assets 111,745,790 170,077,965 Non-current assets: Property and equipment, net 683,014,705 610,634,432 Development costs, net 98,939,725 121,267,664 Deferred mine closure costs 4,849,249 5,211,505 Total non-current assets 786,803,679 737,113,601 898,549,469 907,191,566 LIABILITIES AND SHAREHOLDERS' EQUITY Current liabilities: Accounts payable and accrued liabilities 38,499,280 40,418,619 Zakat and income tax liability 14,966,681 10,932,026 Capital lease obligation, current portion 2,479,480 2,318,301 Long-term debt, current portion 97,500,000 50,000,000 Total current liabilities 153,445,441 103,668,946 Non-current liabilities Provision for mine closure costs 17,030,905 16,625,347 Capital lease obligation, net of current portion 2,022,518 3,898,002 Long-term debt, net of current portion and deferred finance costs 271,626,947 267,933,847 End-of-service indemnities 6,029,921 4,880,892 Deferred income taxes — 4,217,658 Total non-current liabilities 296,710,291 297,555,746 AL MASANE AL KOBRA MINING COMPANY Balance Sheets - (Continued) September 30, December 31, 2020 2019 (Expressed in Saudi Riyals) Commitments and contingencies (Note 14) Shareholders' equity Share capital 820,000,000 820,000,000 Share premium (131,808,900) (74,713,350) Accumulated deficit (239,797,363) (239,319,776) Total shareholders' equity 448,393,737 505,966,874 898,549,469 907,191,566 AL MASANE AL KOBRA MINING COMPANY Statements of Operations For the nine months ended September 30, 2020 and years ended December 31, 2019 and 2018 2020 2019 2018 (Expressed in Saudi Riyals) Revenues 234,872,562 293,811,329 263,377,273 Costs of revenues 208,980,004 279,645,705 255,313,296 Operating income 25,892,558 14,165,624 8,063,977 General and administrative expenses 18,693,047 30,355,423 29,475,998 Income (loss) from operations 7,199,511 (16,189,799) (21,412,021) Other income (expense) Finance charges (4,539,975) (5,436,532) (5,969,821) Other income (expense) (Note 1) (1,300,258) 2,091,152 323,575 (5,840,233) (3,345,380) (5,646,246) Income (loss )before Zakat and income tax 1,359,278 (19,535,179) (27,058,267) Zakat and income tax (expense) benefit (1,836,865) (6,751,156) 1,824,929 Net loss (477,587) (26,286,335) (25,233,338) AL MASANE AL KOBRA MINING COMPANY Statements of Changes in Shareholders' Equity (Expressed in Saudi Riyals) Retained Earnings Share Share Treasury (Accumulated Capital Premium Stock at cost Deficit) Total Balance at December 31, 2017 780,000,000 37,546,420 — (187,800,103) 629,746,317 Issuance of share premium — 2,453,580 — — 2,453,580 Conversion of share premium to share capital 40,000,000 (40,000,000) — — — Net loss — — — (25,233,338) (25,233,338) Balance at December 31, 2018 820,000,000 — — (213,033,441) 606,966,559 Share repurchase (Note 1) — — (74,713,350) — (74,713,350) Net loss — — — (26,286,335) (26,286,335) Balance at December 31, 2019 820,000,000 — (74,713,350) (239,319,776) 505,966,874 Share repurchase (Note 1) — — (57,095,550) — (57,095,550) Net loss — — — (477,587) (477,587) Balance at September 30, 2020 820,000,000 — (131,808,900) (239,797,363) 448,393,737 AL MASANE AL KOBRA MINING COMPANY Statements of Cash Flows For the nine months ended September 30, 2020 and years ended December 31, 2019 and 2018 2020 2019 2018 (Expressed in Saudi Riyals) Cash flows from operating activities: Net loss (477,587) (26,286,335) (25,233,338) Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Depreciation and amortization 77,148,251 113,949,259 125,507,864 Accretion of deferred mine closure costs 405,558 562,211 543,198 Amortization of deferred finance costs 1,193,100 1,675,135 2,175,902 Deferred income taxes (4,217,658) 424,873 (7,224,929) Forfeiture of non-refundable deposit 1,429,670 — — Changes in operating assets and liabilities: Accounts receivable 20,954,547 (13,408,437) (8,021,219) Inventories (9,740,484) 10,593,780 (18,644,188) Advances to contractors and other 29,402,704 (30,884,252) 563,016 Accounts payable and accrued liabilities (1,919,339) 11,661,674 6,084,327 Zakat and income tax liability 4,034,655 5,532,026 1,883,327 End-of-service indemnities 1,149,029 1,231,003 1,131,360 Net cash provided by operating activities 119,362,446 75,050,937 78,765,320 Cash flows from investing activities: Additions to property and equipment (126,838,330) (48,246,282) (28,945,309) Cash flows from financing activities: Issuance of share capital and premium — — 2,453,580 Payments on capital lease obligations (1,714,305) (1,059,694) (72,788) Repurchase of treasury stock (55,665,879) (22,151,322) — Borrowings from long-term debt 50,000,000 50,000,000 — Payments on long-term debt — (30,000,000) — Net advances to shareholders — (2,859,341) (53,015,844) Net cash used in financing activities (7,380,184) (6,070,357) (50,635,052) Increase (decrease) in cash and cash equivalents and restricted cash (14,856,068) 20,734,298 (815,041) Cash, cash equivalents and restricted cash, beginning of period 52,244,794 31,510,496 32,325,537 Cash, cash equivalents and restricted cash, end of period 37,388,726 52,244,794 31,510,496 Supplemental cash flow information Cash paid for interest 3,346,875 4,428,545 3,927,778 Cash paid for Zakat and income tax 2,019,868 6,086,073 3,212,813 Supplemental disclosure of non-cash items Assets acquired through capital lease obligations — 7,933,140 625,805 Advances to shareholders applied to treasury stock purchase 1,429,671 52,562,028 —

AMAK Organization and Business

AMAK Organization and Business	12 Months Ended
	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
AMAK Organization and Business	BUSINESS AND OPERATIONS OF THE COMPANY Trecora Resources (the “Company”) was organized as a Delaware corporation in 1967. The Company’s principal business activities are the manufacturing of various specialty petrochemicals products, specialty waxes and providing custom processing services. The Company’s specialty petrochemicals operations are primarily conducted through a wholly-owned subsidiary, Texas Oil and Chemical Co. II, Inc. (“TOCCO”). TOCCO owns all of the capital stock of South Hampton Resources, Inc. (“SHR”) and Trecora Chemical, Inc. (“TC”). SHR owns all of the capital stock of Gulf State Pipe Line Company, Inc. (“GSPL”). SHR owns and operates a specialty petrochemicals product facility in Silsbee, Texas which manufactures high purity hydrocarbons used primarily in polyethylene, packaging, polypropylene, expandable polystyrene, poly-iso/urethane foams, Canadian tar sands, and in the catalyst support industry. TC owns and operates a facility located in Pasadena, Texas which manufactures specialty waxes and provides custom processing services. These specialty waxes are used in the production of coatings, hot melt adhesives and lubricants. GSPL owns and operates pipelines that connect the SHR facility to a natural gas line, to SHR’s truck and rail loading terminal and to a major petroleum pipeline owned by an unaffiliated third party. The Company owns approximately 55% of the capital stock of a Nevada mining company, Pioche Ely Valley Mines, Inc. (“PEVM”), which does not conduct any substantial business activity but owns undeveloped properties in the United States. The Company also previously owned 33% of a Saudi Arabian joint stock company, Al Masane Al Kobra Mining Company (“AMAK”). On October 2, 2019, we announced that we had entered into a Share Sale and Purchase Agreement (as amended, the “Purchase Agreement”) pursuant to which we agreed to sell our entire investment in AMAK. The share sale was completed on September 28, 2020. For more information, see Note 6. We attribute revenues to countries based upon the origination of the transaction. All of our revenues for the years ended December 31, 2020, 2019, and 2018, originated in the United States. In addition, all of our long-lived assets are in the United States. For convenience in this report, the terms “Company", “our", “us", “we" or “TREC" may be used to refer to Trecora Resources and its subsidiaries.
AMAK
Schedule of Equity Method Investments [Line Items]
AMAK Organization and Business	Note 1 – Organization and Business Organization Al Masane Al Kobra Mining Company (us, we, our, AMAK or the Company) is a Saudi Arabian closed joint stock company approved by the Minister of Commerce and Industry Decree Number 247/Q dated 9/10/1428 (October 21, 2007) and registered in Jeddah under Commercial Registration No. 4030175345 on 7/1/1429 (January 16, 2008). During 2015, the head office was moved from Jeddah to Najran. Accordingly, Najran Commercial Registration No. 5950017523 dated 03/11/1431H (October 11, 2010) was modified to be the main Commercial Registration. All amounts are expressed in Saudi Riyals (SR) unless otherwise noted. During 2009, the authorized capital of the Company was 450,000,000 consisting of 45 million shares of SR10 each of which 50% were issued for cash. The remaining 50% were issued for the contribution of mining rights and assets from Trecora Resources (Trecora) subject to Trecora’s liability for a loan in the amount of 41,250,000 due to the Ministry of Finance and National Economy. The mining rights in Al Masane mine were originally granted by Royal Decree Number M/17 effective 1/12/1413 (May 22, 1993) for a period of thirty years, with a right of renewal for a further period of twenty years to Trecora. The mining rights granted Trecora the right of exploitation in Al Masane mine located in Najran, Saudi Arabia, with an area of 44 square kilometers for a surface rental of 10,000 per square kilometer per year, i.e. 440,000 per year. As per the Ministry of Petroleum and Mineral Resources resolution dated 13/9/1429 (13/9/2008) and the ministry subsequent letter dated 2/1/1430 (30/12/2008), the aforementioned rights were transferred to us. During 2011, the Company increased its authorized share capital by SR50,000,000 to SR500,000,000 and issued 5,000,000 shares of 10 each at a price of SR28 each resulting in a share premium of SR90,000,000. The entire 5,000,000 shares were issued for cash to Arab Mining Company (ARMICO) headquartered in Amman, Jordan. During 2013, the Company increased its authorized share capital by SR50,000,000 to SR550,000,000 and issued 5,000,000 shares of 10 each at a price of SR30 each resulting in a share premium of SR100,000,000. The shares were issued for cash to existing shareholders. During 2015, the Company increased its authorized share capital by SR190,000,000 to SR 740,000,000 and issued 19,000,000 shares of 10 each by transferring from share premium accounts. During 2016, the Company increased its authorized share capital by SR40,000,000 to SR780,000,000 and issued 4,000,000 shares of 10 each at a price of SR20 each resulting in a share premium of SR35,092,840. During 2018, the Company increased share premium by SR2,453,580 for shares that were previously issued. In addition, the Company increased its authorized share capital by SR40,000,000 to SR820,000,000 and issued 4,000,000 shares of 10 each by transferring from share premium accounts. During the Company’s Extraordinary General Assembly Meeting in October of 2018, the shareholders approved to repurchase up to 2,500,000 shares from the shareholders at a price of SR30 each and to register these shares as treasury shares. In December 2018, the Board unanimously approved this proposal and authorized the CEO to proceed with the repurchase. The Company advanced certain shareholders their portion of these proceeds in 2018. During the first quarter of 2019, the Company finalized the transaction and repurchased 2,490,445 shares for approximately SR74,713,000. On October 2, 2019, the Company and certain shareholders of the Company (collectively, the “Purchasers”) entered into a Share Sale and Purchase Agreement (“Purchase Agreement”) with Trecora to purchase their entire equity interest in the Company for an aggregate gross purchase price of approximately SR264,700,000. The Purchase Agreement contains various representations, warranties and indemnity obligations of the Purchasers and Trecora. As required by the Purchase Agreement, the Purchasers advanced 5% of the purchase price to Trecora as a non-refundable deposit tha twould be applied to the purchase price. The Company’s share of the advance was approximately, SR2,855,000 and was included in advances to shareholders in the accompanying balance sheets as of December 31, 2019. On January 16, 2020, the Purchasers and Trecora entered into an amendment to extend the close date to March 31, 2020 to allow additional time for the parties to obtain certain required governmental approvals. On March 26, 2020, the Company entered into a second amendment that the Purchasers would complete the purchase of their portion of the shares in multiple closings. Purchasers that completed their portion of the sale after March 31, 2020 but on or before September 28, 2020, would forfeit an amount equal to 50% of their non-refundable deposit as liquidated damages and would not be applied to the purchase price at closing. On April 1, 2020, the Company forfeited SR1,429,726 of their non-refundable deposit and is included in other income (expense) on the accompanying statement of operations. On August 10, 2020, the Company closed their portion of the Purchase Agreement and purchased 5,709,555 shares from Trecora for SR57,095,550. The Company has recorded these shares as treasury stock. On September 24, 2020, the remaining Purchasers purchased Trecora’s remaining outstanding shares. In connection with the completion of the Purchase Agreement, the Company entered into an agreement with Trecora whereby the Company agreed to withhold approximately SR7,878,000 of the purchase price to pay Trecora’s capital gain tax obligations. These amounts have been shown as restricted cash and the liability is included in Zakat and income tax liabilities on the accompanying balance sheet as of September 30, 2020. As of September 30, 2020, our ownership is as follows: Shares Ownership Saudi shareholders 53,936,081 73.1 ARMICO (Pan Arab Organization) 19,502,500 26.4 Other 361,419 0.5 73,800,000 100.0 Business and operations Our principal activity is to produce zinc and copper concentrates and silver and gold doré as per the license Number 993/2 dated 16/7/1428 (July 31, 2007) issued by Saudi Arabian General Investment Authority (SAGIA). We commenced our commercial production on July 1, 2012. During 2015, we received a new mining lease for an area near our current mining area for the Guyan ancient mine. Over the years, we have performed renovations and maintenance to improve recoveries overall and upgrade the precious metals circuit through the installation of SART (sulfidization, acidification, recycling, and thickening) modifications which are expected to lower chemical use, thereby reducing operating costs. During 2020 we completed an analysis of our mineral reserve estimates and extended the life of the mine and have made capital investments in the Guyan mining area.

AMAK Summary of Significant Acc

AMAK Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
AMAK Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation – The Consolidated Financial Statements include the balance sheets, statements of operations, stockholders' equity, and cash flows of the Company, TOCCO, TC, SHR, GSPL and PEVM. Other entities which are not controlled but over which the Company has the ability to exercise significant influence are accounted for using the equity method of accounting. All intercompany profits, transactions and balances have been eliminated. Cash, Cash Equivalents and Short-Term Investments – Our principal banking and short-term investing activities are with local and national financial institutions. Short-term investments with an original maturity of three months or less are classified as cash equivalents. Inventories – For SHR, finished products and feedstock are recorded at the lower of cost, determined on the first-in, first-out method (FIFO), or market. For TC, inventory is recorded at the lower of cost or market as follows: (1) raw material cost is calculated using the weighted-average cost method and (2) product inventory cost is calculated using the specific cost method. Trade Receivables and Allowance for Doubtful Accounts – We evaluate the collectability of our trade receivables and adequacy of the allowance for doubtful accounts based upon historical experience and any specific customer financial difficulties of which we become aware. For the year ended December 31, 2020, we decreased the allowance for doubtful accounts balance by $129,000 due to the write off of previously allowed for receivables. For the year ended December 31, 2019, we decreased the balance by $23,000 due to collections of previously allowed for receivables. For the year ended December 31, 2018, we increased the balance by $152,000 due to concerns regarding collectability for a specific customer. We track customer balances and past due amounts to determine if customers may be having financial difficulties. This, along with historical experience and a working knowledge of each customer, helps determine accounts that should be written off. Amounts written off were $129,000, nil and nil in 2020, 2019 and 2018, respectively. Discontinued Operations – Assets that are sold or classified as held for sale are classified as discontinued operations provided that the disposal represents a strategic shift that has (or will have) a major effect on our operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method investment or other major parts of an entity). Plant, Pipeline and Equipment – Plant, pipeline and equipment are stated at cost. Depreciation is provided over the estimated service lives using the straight-line method. Gains and losses from disposition are included in operations in the period incurred. Maintenance and repairs are expensed as incurred. Major renewals and improvements are capitalized. Interest costs incurred to finance expenditures during construction phase are capitalized as part of the historical cost of constructing the assets. Construction commences with the development of the design and ends when the assets are ready for use. Capitalized interest costs are included in plant, pipeline and equipment and are depreciated over the service life of the related assets. Labor costs incurred to self-construct assets are capitalized as part of the historical cost the assets. Construction commences with the development of the design and ends when the assets are ready for use. Capitalized labor costs are included in plant, pipeline and equipment and are depreciated over the service life of the related assets. Platinum catalyst is included in plant, pipeline and equipment at cost. Amortization of the catalyst is based upon cost less estimated salvage value of the catalyst using the straight line method over the estimated useful life (see Note 8). Leases – The Company enters into leases as a lessee for rail cars, rail equipment, office space and office equipment in the ordinary course of business. When procuring services, or upon entering into a contract, the Company determines whether an arrangement contains a lease at its inception. As part of that evaluation the Company considers whether there is an implicitly or explicitly identified asset in the arrangement and whether the Company, as the lessee, has the right to control the use of that asset. The Company also reviews all options to extend, terminate, or purchase its right-of-use assets at the inception of the lease and accounts for these options when they are reasonably certain of being exercised. All leases with a term of more than 12 months are recognized as right-of-use (“ROU”) assets and associated lease liabilities in the combined balance sheet. Lease liabilities are measured at the lease commencement date and determined using the present value of the lease payments not yet paid, at the Company’s incremental borrowing rate, which approximates the rate at which the Company would borrow on a secured basis. The interest rate implicit in the lease is generally not determinable in the transactions where the Company is the lessee. The ROU asset equals the lease liability adjusted for any initial direct costs, prepaid rent and lease incentives. All of the Company’s leases are classified as operating leases. The leases include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. The Company made a policy election to not recognize leases with a lease term of 12 months or less in the combined balance sheet. Lease expense for these leases is recognized on a straight-line basis over the lease term. Goodwill and Other Intangible Assets – Goodwill and indefinite-lived intangible assets are tested for impairment at least annually; however, these tests are performed more frequently when events or changes in circumstances indicate that the asset may be impaired. Impairment exists when carrying value exceeds fair value. Estimates of fair value are based on appraisals, market prices for comparable assets, or internal estimates of future net cash flows. Definite-lived intangible assets consist of customer relationships, licenses, permits and developed technology. The majority of these assets are being amortized using discounted estimated future cash flows over the term of the related agreements. Intangible assets associated with customer relationships are being amortized using the discounted estimated future cash flows method based upon assumed rates of annual customer attrition. We continually evaluate the reasonableness of the useful lives of these assets. Once these assets are fully amortized, they will be removed from the consolidated balance sheets. During 2019 we adopted new accounting guidance and removed the second step of the goodwill impairment test. Under step two, an entity was required to determine the fair value of individual assets and liabilities of a reporting unit (including unrecognized assets and liabilities) using the procedure for determining fair values in a business combination. As a result, goodwill impairment is now measured at the amount by which a reporting unit’s carrying amount exceeds its fair value, with any impairment charge limited to the carrying amount of goodwill. Business Combinations and Related Business Acquisition Costs – Assets and liabilities associated with business acquisitions are recorded at fair value using the acquisition method of accounting. We allocate the purchase price of acquisitions based upon the fair value of each component which may be derived from various observable and unobservable inputs and assumptions. We may use third-party valuation specialists to assist us in this allocation. Initial purchase price allocations are preliminary and subject to revision within the measurement period, not to exceed one year from the date of acquisition. The fair value of property, plant and equipment and intangible assets are based upon the discounted cash flow method that involves inputs that are not observable in the market (Level 3). Goodwill assigned represents the amount of consideration transferred in excess of the fair value assigned to identifiable assets acquired and liabilities assumed. Business acquisition costs are expensed as incurred and are reported as general and administrative expenses in the consolidated statements of income. We define these costs to include finder’s fees, advisory, legal, accounting, valuation, and other professional consulting fees, as well as, travel associated with the evaluation and effort to acquire specific businesses. Investment in AMAK – Prior to the completion of the sale of our ownership interest in AMAK, we accounted for our investment in AMAK using the equity method of accounting under which we recorded in income our share of AMAK’s income or loss for each period. The amount recorded was also adjusted to reflect the amortization of certain differences between the basis in our investment in AMAK and our share of the net assets of AMAK was reflected in AMAK’s financial statements (see Note 6). Any proceeds received from or payments made to AMAK were recorded as decreases or increases in the balance of our investment. Other Assets – Other assets include a license used in specialty petrochemicals operations, spare parts inventory, insurance receivables and certain specialty petrochemicals assets. Spare parts are accounted for using FIFO. Long-Lived Assets Impairment – Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable based on the undiscounted net cash flows to be generated from the asset’s use. The amount of the impairment loss to be recorded is calculated by the excess of the asset’s carrying value over its fair value. Fair value is generally determined using a discounted cash flow analysis although other factors including the state of the economy are considered. Revenue Recognition – Revenue is measured based on a consideration specified in a contract with a customer. The Company recognizes revenue when it satisfies a performance obligation by transferring control over a product or service to a customer. In evaluating when a customer has control of the asset we primarily consider whether the transfer of legal title and physical delivery has occurred, whether the customer has significant risks and rewards of ownership, and whether the customer has accepted delivery and a right to payment exists. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from revenue. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are included in cost of product sales and processing. The Company does not offer material rights of return or service-type warranties. The following is a description of principal activities – separated by reportable segments – from which the Company generates its revenue. For more detailed information about reportable segments, disaggregation of revenues, and contract balance disclosures, see Note 17. Specialty Petrochemicals segment The Specialty Petrochemicals segment of the Company produces eight high purity hydrocarbons and other petroleum based products including isopentane, normal pentane, isohexane and hexane. These products are used in the production of polyethylene, packaging, polypropylene, expandable polystyrene, poly-iso/urethane foams, crude oil from the Canadian tar sands, and in the catalyst support industry. SHR’s specialty petrochemicals products are typically transported to customers by rail car, tank truck, iso-container and ship. Product Sales – The Company sells individual (distinct) products to its customers on a stand-alone basis (point-of-sale) without any further integration. There is no significant modification of any one or more products sold to fulfill another promised product or service within any of the Company’s product sale transactions. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment for prime product sales is typically due and collected 30 to 60 days subsequent to point of sale. Processing Fees – The Company’s services consist of processing customer supplied feedstocks into custom products including, if requested, services for forming, packaging, and arranging shipping. Pursuant to Tolling Agreements the customer retains title to the feedstocks and processed products. The performance obligation in each Tolling Agreement transaction is the processing of customer provided feedstocks into custom products and is satisfied over time. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment is typically due and collected within 30 days subsequent to point of sale. Specialty Waxes segment The Specialty Waxes segment of the Company manufactures and sells specialty polyethylene and poly alpha olefin waxes and also provides custom processing services for customers. Product Sales – The Company sells individual (distinct) products to its customers on a stand-alone basis (point-of-sale) without any further integration. There is no significant modification of any one or more products sold to fulfill another promised product or service within any of the Company’s product sale transactions. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment is typically due and collected within 30 days subsequent to point of sale. Processing Fees – The Company’s promised services consist of processing customer supplied feedstocks into custom products including, if requested, services for forming, packaging, and arranging shipping. Pursuant to Tolling Agreements and Purchase Order Arrangements, the customer typically retains title to the feedstocks and processed products. The performance obligation in each Tolling Agreement transaction and Purchase Order Arrangement is the processing of customer provided feedstocks into custom products and is satisfied over time. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment is typically due and collected within 30 days subsequent to point of sale. Shipping and Handling Costs – Shipping and handling costs are classified as cost of product sales and processing and are expensed as incurred. Retirement Plan – We offer employees the benefit of participating in a 401(k) plan. We match 100% up to 6% of pay with vesting occurring over 2 years. For years ended December 31, 2020, 2019, and 2018, matching contributions of approximately $1,271,000, $1,321,000, and $1,502,000, respectively, were made on behalf of employees. Environmental Liabilities – Remediation costs are accrued based on estimates of known environmental remediation exposure. Ongoing environmental compliance costs, including maintenance and monitoring costs, are expensed as incurred. Other Liabilities – We periodically make changes in or expand our custom processing units at the request of the customer. The cost to make these changes is shared by the customer. Upon completion of a project a note receivable and a deferred liability are recorded to recover the project costs which are then capitalized. At times instead of a note receivable being established, the customer pays an upfront cost. The amortization of other liabilities is recorded as a reduction to depreciation expense over the life of the contract with the customer. As of December 31 of each year, depreciation expense was offset and reduced by approximately $0.8 million, $0.8 million, and $0.8 million, for 2020, 2019, and 2018, respectively. Net Income Per Share – We compute basic income per common share based on the weighted-average number of common shares outstanding. Diluted income per common share is computed based on the weighted-average number of common shares outstanding plus the number of additional common shares that would have been outstanding if potential dilutive common shares, consisting of stock options, unvested restricted stock units, and shares which could be issued upon conversion of debt, had been issued (see Note 18). Foreign Currency – The functional currency for the Company and each of the Company’s subsidiaries is the US dollar (USD). Transaction gains or losses as a result of transactions denominated and settled in currencies other than the USD are reflected in the statements of income as foreign exchange transaction gains or losses. We do not employ any practices to minimize foreign currency risks. The functional and reporting currency of AMAK is the Saudi Riyal (SR). In June 1986 the SR was officially pegged to the USD at a fixed exchange rate of 1 USD to 3.75 SR; therefore, we translate SR into our reporting currency of the USD for income statement and balance sheet purposes using the fixed exchange rate. As of December 31, 2020, 2019 and 2018, foreign currency translation adjustments were not significant. Management Estimates – The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Significant estimates include allowance for doubtful accounts receivable and inventory obsolescence; assessment of impairment of our long-lived assets and intangible assets; litigation liabilities, post-retirement benefit obligations, guarantee obligations, environmental liabilities, and current and deferred income taxes. Actual results could differ from these estimates. In early 2020, the World Health Organization declared the rapidly spreading coronavirus disease (“COVID-19”) outbreak a pandemic. This pandemic has resulted in governments worldwide enacting emergency measures to combat the spread of the virus. The Company considered the impact of COVID-19 on the assumptions and estimates used and determined that there were no material adverse impacts on the Company’s results of operations and financial position at December 31, 2020. The Company is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of the date of issuance of the financial statements. These estimates may change, as new events occur and additional information is obtained. Share-Based Compensation – We recognize share-based compensation of stock options granted based upon the fair value of options on the grant date using the Black-Scholes pricing model (see Note 15). Share-based compensation expense recognized during the period is based on the fair value of the portion of share-based payments awards that is ultimately expected to vest. Share-based compensation expense recognized in the consolidated statements of operations for the years ended December 31, 2020, 2019, and 2018 includes compensation expense based on the estimated grant date fair value for awards that are ultimately expected to vest, and accordingly has been reduced for estimated forfeitures. Estimated forfeitures at the time of grant are revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Fair Value – The carrying value of cash and cash equivalents, trade receivables, taxes receivable, accounts payable, accrued liabilities, and other liabilities approximate fair value due to the immediate or short-term maturity of these financial instruments. The fair value of variable rate long term debt and notes payable reflect recent market transactions and approximate carrying value. We used other observable inputs that would qualify as Level 2 inputs to make our assessment of the approximate fair value of our cash and cash equivalents, trade receivables, taxes receivable, accounts payable, accrued liabilities, other liabilities, notes payable and variable rate long term debt. We measure fair value by ASC Topic 820 Fair Value. ASC Topic 820 defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements. ASC Topic 820 applies to reported balances that are required or permitted to be measured at fair value under existing accounting pronouncements; accordingly, the standard amends numerous accounting pronouncements but does not require any new fair value measurements of reported balances. ASC Topic 820 emphasizes that fair value, among other things, is based on exit price versus entry price, should include assumptions about risk such as nonperformance risk in liability fair values, and is a market-based measurement, not an entity-specific measurement. When considering the assumptions that market participants would use in pricing the asset or liability, ASC Topic 820 establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity’s own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). The fair value hierarchy prioritizes inputs used to measure fair value into three broad levels. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. Income Taxes – Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company maintains a valuation allowance for a deferred tax asset when it is deemed to be more likely than not that some or all of the deferred tax asset will not be realized. Our estimate of the potential outcome of any uncertain tax issues is subject to management’s assessment of relevant risks, facts, and circumstances existing at that time. We use a more likely than not threshold for financial statement recognition and measurement of tax position taken or expected to be taken in a tax return. To the extent that our assessment of such tax position changes, the change in estimate is recorded in the period in which the determination is made. We report tax-related interest and penalties as a component of income tax expense. Subsequent Events – The Company has evaluated subsequent events through March 9, 2021, the date that the Consolidated Financial Statements were approved by management. Recently Adopted Accounting Pronouncements Effective January 1, 2020, we adopted Financial Accounting Standard Board (“FASB”) Accounting Standards Update (“ASU”) 2016-13, Measurement of Credit Losses on Financial Instruments, which changed the way entities recognize impairment of most financial assets. Short-term and long-term financial assets, as defined by the standard, are impacted by immediate recognition of estimated credit losses in the financial statements, reflecting the net amount expected to be collected. The adoption of this standard did not have a material impact on our Consolidated Financial Statements. Recent Accounting Pronouncements Not Yet Adopted In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (ASU 2019-12), which simplifies the accounting for income taxes. This guidance will be effective for us in the first quarter of 2021 on a prospective basis, and early adoption is permitted. The Company does not expect that the adoption of this guidance will have a material impact on our Consolidated Financial Statements. In March 2020, the FASB issued ASU No. 2020–04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting (ASU 2020-04), which provides guidance to alleviate the burden in accounting for reference rate reform by allowing certain expedients and exceptions in applying generally accepted accounting principles to contracts, hedging relationships, and other transactions impacted by reference rate reform. The provisions of ASU 2020-04 apply only to those transactions that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. This guidance is effective from March 12, 2020 through December 31, 2022 and adoption is optional. We are currently evaluating the impact of ASU 2020-04 on our Consolidated Financial Statements.
AMAK
Schedule of Equity Method Investments [Line Items]
AMAK Summary of Significant Accounting Policies	Summary of Significant Accounting Policies The accompanying financial statements have been prepared using U.S. generally accepted accounting principles. The following is a summary of our significant accounting policies: Cash and cash equivalents We consider all highly-liquid investments purchased with an original maturity of three months or less to be cash equivalents. Restricted cash Restricted cash consists of amounts withheld from non-Saudi shareholders related to the Purchase Agreement for amount sdue to the General Authority of Zakat and Tax (GAZT) in the Kindom of Saudi Arabia for capital gains and income taxes. Accounts receivable We evaluate the collectability of our accounts receivable and the adequacy of the allowance for doubtful accounts based upon historical experience and any specific customer financial difficulties of which the Company becomes aware. During the nine months ended September 30, 2020 and years ended December 31, 2019 and 2018, we sold our concentrates and doré pursuant to sales contracts with primarily one customer. No amounts have been written off for the nine months ended September 30, 2020 and the years ended December 31, 2019 and 2018. In addition, we determined that an allowance for doubtful accounts was not necessary at September 30, 2020 and December 31, 2019. Inventories The components of inventories include mill stockpiles, precious metal doré, chemicals, and mining supplies. Inventories are stated at the lower of weighted-average cost or market. Costs of mill stockpiles inventory include labor and benefits, supplies, energy, depreciation, depletion, amortization, and other necessary costs incurred with the extraction and processing of ore. Corporate general and administrative costs are not included in inventory costs. Because it is generally impracticable to determine the minerals contained in mill stockpiles by physical count, reasonable estimation methods are employed. The quantity of material delivered to the mill stockpiles is based on surveyed volumes of mined material and daily production records. Expected mineral recovery rates from the mill stockpiles are determined by various metallurgical testing methods. Property and equipment Property and equipment is carried at cost less accumulated depreciation. Expenditures for replacements and improvements are capitalized. Costs related to periodic maintenance are expensed as incurred. Depletion of the mining assets is determined using the unit-of-production method based on total estimated proven and probable reserves. Depletion and amortization using the unit-of-production method is recorded upon extraction of the ore, at which time it is allocated to inventory cost and then included as a component of cost of goods sold. Other assets are depreciated on a straight-line basis over their estimated useful lives ranging from 3 to 20 years. Borrowing costs that are directly attributable to the acquisition, construction or production of assets are capitalized as part of the cost of those assets. Assets under construction are capitalized in the construction in progress account. Upon completion, the cost of the related asset is transferred to the appropriate category of property and equipment. Development costs Mineral exploration costs, as well as drilling and other costs incurred for the purpose of converting mineral resources to proven and probable reserves or identifying new mineral resources are charged to expense as incurred. Development costs are capitalized beginning after proven and probable reserves have been established. Development costs include costs incurred in mine pre-production activities undertaken to gain access to proven and probable reserves, including shafts, drifts, ramps, permanent excavations, infrastructure and removal of overburden. These costs are deferred net of the proceeds from the sale of any production during the development period and then amortized using an estimated unit-of-production method. If a mine is no longer considered economical, the accumulated costs are charged to the statement of operations in the year in which the determination is made. Asset impairment We review and evaluate our long-lived assets for impairment when events or changes in circumstances indicate that the carrying amounts may not be recoverable. Long-lived assets are evaluated for impairment under the two-step model. When events or circumstance suggest impairment of long-lived assets, estimated undiscounted future net cash flows are calculated using future estimated commodity prices, proven and probable reserves, and estimated net proceeds from the disposition of assets on retirement, less operating, sustaining capital, and reclamation costs. If it is determined that an impairment exists, an impairment loss is measured as the amount by which the asset carrying value exceeds its fair value. Fair value is generally determined using valuation techniques such as estimated future cash flows. Because the cash flows used to assess recoverability of our long-lived assets and measure fair value of our mining operations require us to make several estimates and assumptions that are subject to risk and uncertainty, changes in these estimates and assumptions could result in the impairment of our long-lived asset values. Based on our evaluation, we recorded no impairment losses during the nine months ended September 30, 2020 and the years ended December 31, 2019 and 2018. End-of-service indemnities Employee end-of-service benefits are accrued for the benefit of employees under the terms and conditions of Saudi Labor Law and Regulations and their employment contracts. End-of-service indemnities are provided for and accrued in the financial statements based on the respective employees' salaries and length of service. Foreign currency Our functional currency is the Saudi Riyal (SR). In June 1986, the Saudi Riyal was officially pegged to the U.S. Dollar at a fixed exchange rate of 1 U.S. Dollar to 3.75 riyals. Foreign currency transactions are translated into Saudi Riyals at the rates of exchange prevailing at the time of the transactions. Monetary assets and liabilities denominated in foreign currencies at the balance sheet date are translated at the exchange rates prevailing at that date. Any gains and losses from settlement and translation of foreign currency transactions are included in the statement of operations. There were no material foreign-currency exchange gains or losses or translation adjustments during the nine months ended September 30, 2020 and the years ended December 31, 2019 and 2018. Leasing arrangements We periodically lease operating equipment, facilities, and office buildings. Rentals payable under operating leases are charged to the statements of operations on a straight-line basis over the term of the relevant lease. For any capital leases, the present value of future minimum lease payments at the inception of the lease is reflected as an asset and a liability in the balance sheet. Amounts due within one year are classified as short-term liabilities and the remaining balance as long-term liabilities. Finance charges are charged to the statement of operations. Operating lease expense amounted to approximately SR2,531,000, SR4,015,000 and SR1,619,000 for the nine months ended September 30, 2020 and the years ended December 31, 2019 and 2018, respectively. Environmental costs Environmental costs are expensed or capitalized, depending upon their future economic benefits. Accruals for such expenditures are recorded when it is probable that obligations have been incurred and the costs can reasonably be estimated. Ongoing compliance costs are expensed as incurred. Asset retirement obligations and costs We record the fair value of our estimated asset retirement obligations (ARO) associated with tangible long-lived assets in the period in which the obligation is incurred. ARO associated with long-lived assets are those for which there is a legal obligation to settle under various laws, statues, or regulations. These obligations, which are initially estimated based on discounted cash flow estimates, are accreted to full value over time through charges to cost of revenues. In addition, asset retirement costs (ARCs) are capitalized as part of the related asset’s carrying value and are depreciated (primarily on a unit-of-production basis) over the asset’s respective useful life. Our ARO consist primarily of costs associated with mine reclamation and closure activities and are included in deferred mine closure costs on the accompanying balance sheets. At least annually, we review our ARO estimates for changes in the projected timing and changes in cost estimates and additional ARO incurred during the period. Zakat and income tax We are subject to the Regulations of GAZT in the Kingdom of Saudi Arabia. Under these regulations, Zakat is payable at 2.5% on the basis of the portion of our Zakat base attributable to our Saudi stockholders, and income tax is payable at 20% on the portion of our taxable income attributable to our non-Saudi stockholders. Zakat and income tax are provided on an accrual basis. Any difference in the estimate is recorded when the final assessment is approved, at which time the provision is cleared. We account for deferred income taxes on non-Saudi owners utilizing an asset and liability method, whereby deferred tax assets and liabilities are recognized based on the tax effects of temporary differences between the financial statements and the income tax basis of assets and liabilities, as measured by the effective tax rate. When appropriate, we evaluate the need for a valuation allowance based on a more likely than not threshold to reduce deferred tax assets to estimated recoverable amounts. We account for uncertain income tax positions using a threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. We report tax-related interest and penalties as a component of Zakat and income tax expense. We recognized no material adjustment for unrecognized income tax liabilities. Revenue recognition The Company’s revenues primary consists of sales of copper and zinc. We sell our products pursuant to individual sales contracts entered into with a customer who acts as an intermediary and resells our products to end users. The Company considers each sales contract to be a single performance obligation, represented by the delivery of a series of distinct goods that are substantially the same, with the same pattern of transfer to the Company’s customer. The Company concluded this as, based on the nature of its contracts, the customer receives the benefit of mineral sold as it is shipped per the terms of the commercial invoice at each delivery date. In addition, the Company considers that it has a right to consideration from its customers in an amount that corresponds directly to the value transferred to those customers that being the quantity of mineral delivered at the price per unit delivered. Accordingly, the Company recognizes revenue at the amount to which it has the right to invoice (the invoice practical expedient), as it believes that this method is a faithful depiction of the transfer of goods to its customers. Revenue is recognized when or as the performance obligations are satisfied, when the Company transfers control of the goods and title passes to the customer. Control is transferred generally upon the completion of loading the material as the point of origin. This is the point which the customer obtains legal title to the product as well as the ability to direct the use of and obtain substantially all the remaining benefits of ownership of the assets. Sales are recorded based on a provisional sales price or a final sales price calculated in accordance with the terms specified in the relevant sales contract. Under the long-established structure of sales agreements prevalent in the industry, the copper and zinc contained in concentrate is generally “provisionally” priced at the time of shipment. The provisional price received at the time of shipment is later adjusted to a “final” price based on quoted monthly average spot prices on the London Metal Exchange (LME) for a specified future month. We record revenues at the time of shipment (when title and risk of loss pass) based on then-current LME prices, and we account for any changes between the sales price recorded at the time of shipment and subsequent changes in the LME prices through the date of final pricing as gains or losses from a derivative embedded in the sales contract (a futures contract initiated at the date of shipment and settled upon the determination of the “final price”) which is bifurcated and separately accounted for at fair value. The host contract is the sale of the metals contained in the concentrates at the then-current LME price as defined in the contract. Mark-to-market price fluctuations recorded through the settlement date are reflected in revenues for sales contracts. Our embedded derivatives at September 30, 2020 and December 31, 2019, were not significant to the financial statements. Revenues from concentrate sales are recorded net of treatment and refining charges. These allowances are a negotiated term of each contract. Treatment and refining charges represent payments or price adjustments to smelters and refiners and are either fixed, or in certain cases, vary with the price of metals (referred to as price participation). Management estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. The most significant areas requiring the use of management estimates include mineral reserve estimation; useful asset lives for depreciation and amortization; zakat and income taxes; environmental obligations; reclamation and closure costs; estimates of recoverable materials in mill stockpiles; fair value of embedded derivatives; end-of-service indemnities; and asset impairment, including estimates used to derive future cash flows associated with those assets. Actual results could differ from these estimates. In early 2020, the World Health Organization declared the rapidly spreading coronavirus disease (COVID-19) outbreak a pandemic. This pandemic has resulted in governments worldwide enacting emergency measures to combat the spread of the virus. The Company considered the impact of COVID-19 on the assumptions and estimates used and determined that there were no material adverse impacts on the Company’s results of operations and financial position at September 30, 2020. The Company is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of the date of issuance of the financial statements. These estimates may change, as new events occur and additional information is obtained. Recent accounting pronouncements In February 2016 the FASB issued ASU No. 2016-02, Leases (Topic 842), to increase transparency and comparability among organizations by recognizing all lease transactions (with terms in excess of 12 months) on the balance sheet as a lease liability and a right-of-use asset (as defined). The ASU is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years, with earlier application permitted. Upon adoption, the lessee will apply the new standard retrospectively to all periods presented or retrospectively using a cumulative effect adjustment in the year of adoption. The Company has several lease agreements for which the amendments will require the Company to recognize a lease liability to make lease payments and a right-of-use asset which will represent its right to use the underlying asset for the lease term. As permitted by the amendments, the Company is anticipating electing an accounting policy to not recognize lease assets and lease liabilities for leases with a term of twelve months or less. The Company is currently reviewing the amendments to ensure it is fully compliant by the adoption date and does not expect to early adopt. In addition, the Company will change its current accounting policies to comply with the amendments with such changes as mentioned above. Reclassifications Certain reclassifications have been made to the prior periods to conform with the current year presentation. Subsequent events

Liquidity and Capital Resource

Liquidity and Capital Resource	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
AMAK Liquidity and Capital Resource	Liquidity and Capital ResourcesAs shown in the financial statements, we have incurred three consecutive years of net losses however, the Company has operating income and generated cash provided from operations. In addition, during 2020 we have updated our mineral reserve estimates and extended the life of the mine with the expectation that the life of mine will be extended another two

AMAK Inventories

AMAK Inventories	12 Months Ended
	Dec. 31, 2020
Inventory [Line Items]
AMAK Inventories	INVENTORIES Inventories include the following at December 31: 2020 2019 (thousands of dollars) Raw material $ 2,580 $ 2,100 Work in process 138 142 Finished products 10,227 11,382 Total inventory $ 12,945 $ 13,624 Inventory serves as collateral for our amended and restated loan agreement with a domestic bank (see Note 13). Inventory included products in transit valued at approximately $3.6 million and $2.9 million at December 31, 2020 and 2019, respectively.
AMAK
Inventory [Line Items]
AMAK Inventories	Inventories Inventories consisted of the following at: September 30, December 31, 2020 2019 Stockpile ore 15,623,461 18,657,218 Ore concentrates 20,557,020 6,294,948 Precious metal dore 2,235,799 4,490,589 Explosives 484,169 326,599 Chemicals and other 6,117,375 5,507,986 45,017,824 35,277,340

AMAK Advances to Contractors an

AMAK Advances to Contractors and Other	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
AMAK Advances to Contractors and Other	Advances to Contractors and Other Advances to contractors and other consisted of the following at: September 30, December 31, 2020 2019 Advances to contractors 13,668,562 42,672,136 Prepaid expenses 2,251,667 5,185,037 Other miscellaneous advances and receivables 4,730,086 2,195,845 20,650,315 50,053,018

AMAK Property and Equipment

AMAK Property and Equipment	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
AMAK Property and Equipment	PLANT, PIPELINE AND EQUIPMENT Plant, pipeline and equipment include the following at December 31: 2020 2019 (thousands of dollars) Platinum catalyst $ 1,580 $ 1,580 Catalyst 4,325 4,095 Land 5,428 5,428 Plant, pipeline and equipment 270,149 258,651 Construction in progress 6,422 5,052 Total plant, pipeline and equipment 287,904 274,806 Less accumulated depreciation (100,800) (85,887) Net plant, pipeline and equipment $ 187,104 $ 188,919 Plant, pipeline and equipment serve as collateral for our amended and restated loan agreement with a domestic bank (see Note 13). Interest capitalized for construction for 2020, 2019 and 2018 was approximately nil, nil and $0.7 million, respectively. Labor capitalized for construction for 2020, 2019 and 2018 was approximately $0.6 million, $0.0 million and $2.3 million, respectively. Catalyst amortization relating to the platinum catalyst which is included in cost of sales was approximately $1.2 million, $1.3 million and $0.1 million for 2020, 2019 and 2018, respectively.
AMAK
Property, Plant and Equipment [Line Items]
AMAK Property and Equipment	Property and Equipment Property and equipment, net consisted of the following at: September 30, December 31, 2020 2019 Buildings 191,974,662 191,838,962 Leasehold improvements 4,051,062 1,838,317 Heavy equipment 146,801,861 136,066,275 Motor vehicles 22,753,563 22,467,300 Civil works 16,288,221 16,288,221 Tailings dam 23,900,160 23,900,160 Plant and machinery 332,014,825 326,974,958 Mining assets – rehabilitation costs 98,894,826 98,894,826 Mining assets – underground development costs 409,899,633 299,224,519 Construction in progress 3,356,625 4,789,313 1,249,935,438 1,122,282,851 Less accumulated depreciation, depletion and amortization (566,920,733) (511,648,419) 683,014,705 610,634,432 During 2020 and 2019, additions to Mining Assets - underground development costs relates to capital investments in the Guyan mining area. Property and equipment serve as collateral for the SIDF loan agreement (see Note 10). Depreciation, depletion and amortization expense related to property and equipment was approximately, SR55,000,000, SR79,000,000 and SR88,000,000 for the nine months ended September 30, 2020 and the years ended December 31, 2019 and 2018, respectively.

AMAK Development Costs

AMAK Development Costs	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
AMAK Development Costs	Development Costs Development costs, net consisted of the following at: September 30, December 31, 2020 2019 Cost 289,973,237 289,973,237 Accumulated amortization (191,033,512) (168,705,573) 98,939,725 121,267,664 Development costs are amortized using the unit of production method upon extraction of the ore. Amortization expenses related to development costs was approximately SR22,328,000, SR34,014,000 and SR36,250,000 for the nine months ended September 30, 2020 and the years ended December 31, 2019 and 2018, respectively.

AMAK Accounts Payable and Accru

AMAK Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
AMAK Accounts Payable and Accrued Liabilities	ACCRUED LIABILITIES Accrued liabilities at December 31 are summarized as follows: 2020 2019 (thousands of dollars) Accrued state taxes $ 125 $ — Accrued payroll 2,282 1,250 Accrued royalties 260 273 Accrued officer compensation 1,053 1,687 Accrued professional expenses 559 1,000 Accrued foreign taxes 1,054 — Other liabilities 1,524 1,532 Total $ 6,857 $ 5,742
AMAK
Schedule of Equity Method Investments [Line Items]
AMAK Accounts Payable and Accrued Liabilities	Accounts Payable and Accrued Liabilities Accounts payable and accrued liabilities consisted of the following at: September 30, December 31, 2020 2019 Accounts payable and accrued liabilities 33,012,537 36,571,709 Accrued salaries and payroll 5,486,743 3,846,910 38,499,280 40,418,619

AMAK Zakat and Income Tax

AMAK Zakat and Income Tax	12 Months Ended
	Dec. 31, 2020
Income Tax Contingency [Line Items]
AMAK Zakat and Income Tax	INCOME TAXES On March 27, 2020, the CARES Act was enacted into law. The CARES Act allows for the deferral of income and social security tax payments, a five–year carryback for net operating losses (“NOLs”), changes to interest expense and business loss limitation rules, certain new tax credits, and certain new loans and grants to businesses. In connection with the CARES Act, we recognized $16.5 million in NOL carryback claims, of which approximately, $14.1 million was received during the fourth quarter of 2020. In connection with this claim, we received interest income of approximately $0.5 million which is included in miscellaneous income (expense). Our final refund claim for approximately $2.4 million is still outstanding and is included in taxes receivable on the consolidated balance sheet. The provision (benefit) for income taxes from continuing operations consisted of the following: Year ended December 31, 2020 2019 2018 (thousands of dollars) Current federal benefit $ (19,190) $ — $ (74) Current state expense 86 91 31 Deferred federal expense (benefit) 15,140 (3,564) (813) Deferred state expense (benefit) 1 (93) 210 Income tax expense (benefit) $ (3,963) $ (3,566) $ (646) The difference between the year ended effective tax rate in income tax expense (benefit) and the Federal statutory rate of 21% is as follows: 2020 2019 2018 (thousands of dollars) Income taxes at U.S. statutory rate $ 211 $ (3,455) $ (661) State taxes, net of federal benefit 71 256 234 Net operating loss carryback (4,655) — — Research and development credits (518) (203) (263) Permanent and other items 928 (164) 44 Total tax expense (benefit) $ (3,963) $ (3,566) $ (646) The significant difference in rate is primarily due to the ability of the Company under the CARES Act to carryback 2018 and 2019 NOLs to a year with a 35% income tax rate. Other permanent differences include the research and development credit, compensation limits, and stock-based compensation. Tax effects of temporary differences that give rise to significant portions of federal and state deferred tax assets and deferred tax liabilities were as follows: December 31, 2020 2019 (thousands of dollars) Deferred tax liabilities: Plant, pipeline and equipment $ (31,119) $ (29,227) Other assets (31) (32) Operating lease asset (2,211) (2,838) Total deferred tax liabilities $ (33,361) $ (32,097) Deferred tax assets: Net operating loss carryforward — 11,685 Intangible assets 3,396 3,699 Operating lease liability 2,211 2,838 Stock-based compensation 956 1,093 Investment in AMAK — 589 Accounts receivable 65 240 Mineral interests 226 226 Interest expense carryforward — 211 General business credit — 140 Inventory 146 111 Post-retirement benefits 70 71 Charitable contributions — 45 Gross deferred tax assets 7,070 20,948 Valuation allowance (226) (226) Total net deferred tax assets $ 6,844 $ 20,722 Net deferred tax liabilities $ (26,517) $ (11,375) We provided a valuation allowance in 2020 and 2019 against certain deferred tax assets because of uncertainties regarding their realization. In connection with the sale of AMAK, the Company recorded foreign tax expense, recognized as a foreign tax credit, of approximately $1.3 million (See Note 6) during the year ended December 31, 2020. We file an income tax return in the U.S. federal jurisdiction and a margin tax return in Texas. We received notification from the Internal Revenue Service (“IRS”) in February 2020 on the selection of our December 31, 2017 tax return for audit. All audit requests are complete and the Company is expecting to receive confirmation of the audit closing without change. In prior years, we received notification that Texas selected our R&D credit calculations for 2014 and 2015 for audit. The state of Texas had suspended their examination while they comprehensively reviewed their audit procedures for consistency. During the fourth quarter of 2019, we received notice that Texas had completed their review of their procedures and initiated additional requests for information. The Company has timely responded to all requested information. We do not expect any changes related to the Federal or Texas audits. Our federal and Texas tax returns remain open for examination for the years 2016 through 2020. We recognized no adjustment for uncertain tax positions. As of December 31, 2020, and 2019, no interest or penalties related to uncertain tax positions had been accrued.
AMAK
Income Tax Contingency [Line Items]
AMAK Zakat and Income Tax	Zakat and Income Tax We have submitted our Zakat and income tax return for the year ended December 31, 2019 and have obtained our 2019 Zakat certificate. The Zakat base for the Saudi shareholders was positive in 2020, 2019 and 2018 and the corresponding Zakat expense and liability has been recorded. In 2020, 2019 and 2018, there was a taxable profit attributable to our non-Saudi (foreign) shareholders and the current income tax expense and liability has also been recorded, also included in the liability is withholding on non-Saudi shareholders for capital gains taxes in connection with the share repurchase as discussed in Note 1 The components of Zakat and income tax expense (benefit) for the nine months ended September 30, 2020 and years ended December 31, 2019 and 2018 are as follows: 2020 2019 2018 Deferred income tax expense (benefit) (3,277,217) 1,737,276 (12,961,569) Change in valuation allowance (940,440) (1,312,403) 5,736,640 Current Zakat and income tax expense 6,054,522 6,326,283 5,400,000 Zakat and income tax expense (benefit) 1,836,865 6,751,156 (1,824,929) The difference between the effective income tax rate and the statutory rate for non-Saudi shareholders of 20% for the nine months ended September 30, 2020 and the years ended December 31, 2019 and 2018 relates primarily to changes in the valuation allowance and adjustments to estimates in depreciation. Tax effects of temporary differences that give rise to significant portions of non-Saudi owners deferred tax assets and deferred tax liabilities were as follows: September 30, December 31, 2020 2019 Deferred tax assets: Loss carryforward 40,645,080 41,293,547 Other 449,302 799,526 41,094,382 42,093,073 Deferred tax liabilities: Property and Equipment (4,509,734) (8,785,642) Net deferred tax asset 36,584,648 33,307,431 Valuation allowance (36,584,648) (37,525,089) Net deferred tax liability — (4,217,658) At September 30, 2020 and December 31, 2019, we had tax loss carryforwards totaling approximately SR203,225,000 and SR206,468,000. Tax losses may be carried forward indefinitely subject to certain annual limitations for non-Saudi shareholders. We have provided a valuation allowance in 2020 and 2019 against a portion of our gross deferred tax assets because of uncertainties regarding their realization.

AMAK Long-term Debt

AMAK Long-term Debt	12 Months Ended
	Dec. 31, 2020
AMAK
Debt Instrument [Line Items]
AMAK Long-term Debt	Long-term Debt Saudi Industrial Development Fund (SIDF) During 2010, the Company entered into a loan agreement with the SIDF for SR330,000,000 to finish the development of the mine and provide working capital. In May 2020, we amended our agreement with SIDF to adjust the repayment schedule. Payments are due semi-annually starting on May 27, 2021 of approximately SR35,000,000 with a final payment due on April 24, 2024. The loan agreement is collateralized by all the assets of Company and is guaranteed by the shareholders. Banque Saudi Fransi (BSF) During 2019, the Company obtained a credit facility from BSF for SR110,518,400. The facility is to be used to finance capital expenditures related to Guyan and provide bridge financing to SIDF. The agreement bears interest at Saudi Arabian Interbank Offered Rate (SAIBOR) plus 2.5% per annum. In December 2019, the Company received proceeds of SR50,000,000 which will be repaid starting on March 31, 2021 through equal quarterly installments of approximately SR4,167,000 with the final payment due on December 31, 2023. During 2020, the Company received additional proceeds of SR50,000,000 for bridge financing to SIDF. During December 2020, the Company repaid BSF the SR50,000,000 related to the bridge financing to SIDF. Under the terms of the agreements with SIDF and BSF, we are required to maintain certain financial covenants, among other requirements. Long-term debts are summarized as follows at: September 30, December 31, 2020 2019 SIDF 275,000,000 275,000,000 BSF 100,000,000 50,000,000 Deferred finance charges (5,873,053) (7,066,153) Total debt 369,126,947 317,933,847 Less current portion 97,500,000 50,000,000 Total long-term debt, less current portion 271,626,947 267,933,847 Deferred finance costs are comprised of SIDF loan origination charges which are capitalized and amortized over the period of the related loan which approximates the interest method. Loan fees of SR5,873,056 and SR7,066,153 net of accumulated amortization are included net with long-term debt at September 30, 2020 and December 31, 2019. Amortization of loan fees amounted to approximately SR1,835,000, SR1,639,000, and SR1,639,000 for the nine months ended September 30, 2020 and the years ended December 31, 2019 and 2018, respectively. The repayment schedule is as follows: Years Ending 2020 50,000,000 2021 86,666,668 2022 91,666,668 2023 96,666,664 2024 50,000,000 375,000,000

AMAK End-of-Service Indemnities

AMAK End-of-Service Indemnities	12 Months Ended
	Dec. 31, 2020
AMAK
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
AMAK End-of-Service Indemnities	End-of-Service Indemnities The change in the end-of-service indemnities provision is as follows: September 30, December 31, 2020 2019 Balance, beginning of period 4,880,892 3,649,889 Provision 2,198,461 2,208,156 Paid (1,049,432) (977,153) Balance, end of period 6,029,921 4,880,892

AMAK Asset Retirement Obligatio

AMAK Asset Retirement Obligations	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
AMAK Asset Retirement Obligations	Asset Retirement Obligations During 2012, we recorded an ARO for deferred mine closure costs of approximately SR12,843,000. These deferred mine closure costs are being amortized over the estimated life of the mine. Amortization expense was approximately SR362,000, SR541,000, and SR745,000 for the nine months ended September 30, 2020 and the years ended December 31, 2019 and 2018. Deferred mine closure costs consisted of the following at: September 30, December 31, 2020 2019 Cost 12,842,625 12,842,625 Accumulated amortization (7,993,376) (7,631,120) 4,849,249 5,211,505 A summary of changes in our provision for mine closure costs is as follows: September 30, December 31, 2020 2019 2018 Balance, beginning of period 16,625,347 16,063,136 15,519,938 Accretion expense 405,558 562,211 543,198 Balance, end of period 17,030,905 16,625,347 16,063,136 ARO costs may increase or decrease significantly in the future as a result of changes in regulations, changes in engineering designs and technology, permit modifications or updates, changes in mine plans, inflation or other factors and as actual reclamation spending occurs.

AMAK General and Administrative

AMAK General and Administrative Expenses	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
AMAK General and Administrative Expenses	General and Administrative Expenses A summary of general and administrative expenses is as follows: September 30, December 31, 2020 2019 2018 Wages, salaries and related costs 7,823,013 18,701,126 17,036,965 Mine closure and environmental 767,814 1,306,705 1,287,698 Office expenses and other 6,494,431 8,831,910 9,287,218 Travel and accommodation 85,721 27,182 593,046 Professional fees 3,522,068 1,488,500 1,271,071 18,693,047 30,355,423 29,475,998

AMAK Commitments and Contingenc

AMAK Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Loss Contingencies [Line Items]
AMAK Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Litigation The Company is periodically named in legal actions arising from normal business activities. We evaluate the merits of these actions and, if we determine that an unfavorable outcome is probable and can be reasonably estimated, we will establish the necessary reserves. We are not currently involved in legal proceedings that could reasonably be expected to have a material adverse effect on our business, prospects, financial condition or results of operations. We may become involved in material legal proceedings in the future. Supplier Agreements In accordance with our supplier agreements, on a recurring monthly basis, the Company commits to purchasing a determined volume of feedstock in anticipation of upcoming requirements. Feedstock purchases are invoiced and recorded when they are delivered. As of December 31, 2020 and 2019, the value of the remaining undelivered feedstock approximated $9.2 million and $12.4 million, respectively. From time to time, we may incur shortfall fees due to feedstock purchases being below the minimum amounts as prescribed by our agreements with our suppliers. The shortfall fee expenses were $1.1 million, $0.6 million and $0.5 million for the years ended December 31, 2020, 2019, and 2018. Environmental Remediation Amounts charged to expense for various activities related to environmental monitoring, compliance, and improvements were approximately $0.9 million in 2020, $0.9 million in 2019 and $0.7 million in 2018.
AMAK
Loss Contingencies [Line Items]
AMAK Commitments and Contingencies	Commitments and Contingencies Operating lease obligations Our lease commitment for our surface mining lease was initially granted for a period of 30 years through 2024. The lease allows for renewal for an additional 20 years. We also have leases for our corporate offices and three residential villas in Najran through 2025. There is also a mining lease that covers the Guyan area for a period of 20 years through 2034. A summary of these commitments are as follows: Years Ending 2020 247,500 2021 990,000 2022 990,000 2023 550,000 2024 550,000 2025 110,000 Thereafter 990,000 4,427,500 Capital lease obligations We lease certain equipment vehicles under capital lease obligations that are set to expire at various dates through 2022. The future minimum lease payments under the capital lease obligations as of September 30, 2020: 2020 723,727 2021 2,791,921 2022 1,482,543 Total minimum lease payments 4,998,191 Less deferred financial charges (496,193) Total capital lease obligations 4,501,998 Less: current portion of capital lease obligations 2,479,480 Total long term portion, net current portion 2,022,518

AMAK Fair Value Measurement

AMAK Fair Value Measurement	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
AMAK Fair Value Measurement	Fair Value MeasurementFair value accounting guidance includes a hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 inputs) and the lowest priority to unobservable inputs (Level 3 inputs). Level 1 Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 Quoted prices in markets that are not active, quoted prices for similar assets or liabilities in active markets, inputs other than quoted prices that are observable for the asset or liability, or inputs that are derived principally from or corroborated by observable market data by correlation or other means; and Level 3 Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (supported by little or no market activity).

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation – The Consolidated Financial Statements include the balance sheets, statements of operations, stockholders' equity, and cash flows of the Company, TOCCO, TC, SHR, GSPL and PEVM. Other entities which are not controlled but over which the Company has the ability to exercise significant influence are accounted for using the equity method of accounting. All intercompany profits, transactions and balances have been eliminated.
Cash, Cash Equivalents and Short-Term Investments	Cash, Cash Equivalents and Short-Term Investments – Our principal banking and short-term investing activities are with local and national financial institutions. Short-term investments with an original maturity of three months or less are classified as cash equivalents.
Inventories	Inventories – For SHR, finished products and feedstock are recorded at the lower of cost, determined on the first-in, first-out method (FIFO), or market. For TC, inventory is recorded at the lower of cost or market as follows: (1) raw material cost is calculated using the weighted-average cost method and (2) product inventory cost is calculated using the specific cost method.
Trade Receivables and Allowance for Doubtful Accounts	Trade Receivables and Allowance for Doubtful Accounts – We evaluate the collectability of our trade receivables and adequacy of the allowance for doubtful accounts based upon historical experience and any specific customer financial difficulties of which we become aware. For the year ended December 31, 2020, we decreased the allowance for doubtful accounts balance by $129,000 due to the write off of previously allowed for receivables. For the year ended December 31, 2019, we decreased the balance by $23,000 due to collections of previously allowed for receivables. For the year ended December 31, 2018, we increased the balance by $152,000 due to concerns regarding collectability for a specific customer. We track customer balances and past due amounts to determine if customers may be having financial difficulties. This, along with historical experience and a working knowledge of each customer, helps determine accounts that should be written off.
Discontinued Operations	Discontinued Operations – Assets that are sold or classified as held for sale are classified as discontinued operations provided that the disposal represents a strategic shift that has (or will have) a major effect on our operations and financial results (e.g., a disposal of a major geographical area, a major line of business, a major equity method investment or other major parts of an entity).
Plant, Pipeline and Equipment	Plant, Pipeline and Equipment – Plant, pipeline and equipment are stated at cost. Depreciation is provided over the estimated service lives using the straight-line method. Gains and losses from disposition are included in operations in the period incurred. Maintenance and repairs are expensed as incurred. Major renewals and improvements are capitalized. Interest costs incurred to finance expenditures during construction phase are capitalized as part of the historical cost of constructing the assets. Construction commences with the development of the design and ends when the assets are ready for use. Capitalized interest costs are included in plant, pipeline and equipment and are depreciated over the service life of the related assets. Labor costs incurred to self-construct assets are capitalized as part of the historical cost the assets. Construction commences with the development of the design and ends when the assets are ready for use. Capitalized labor costs are included in plant, pipeline and equipment and are depreciated over the service life of the related assets. Platinum catalyst is included in plant, pipeline and equipment at cost. Amortization of the catalyst is based upon cost less estimated salvage value of the catalyst using the straight line method over the estimated useful life (see Note 8).
Leases	Leases – The Company enters into leases as a lessee for rail cars, rail equipment, office space and office equipment in the ordinary course of business. When procuring services, or upon entering into a contract, the Company determines whether an arrangement contains a lease at its inception. As part of that evaluation the Company considers whether there is an implicitly or explicitly identified asset in the arrangement and whether the Company, as the lessee, has the right to control the use of that asset. The Company also reviews all options to extend, terminate, or purchase its right-of-use assets at the inception of the lease and accounts for these options when they are reasonably certain of being exercised. All leases with a term of more than 12 months are recognized as right-of-use (“ROU”) assets and associated lease liabilities in the combined balance sheet. Lease liabilities are measured at the lease commencement date and determined using the present value of the lease payments not yet paid, at the Company’s incremental borrowing rate, which approximates the rate at which the Company would borrow on a secured basis. The interest rate implicit in the lease is generally not determinable in the transactions where the Company is the lessee. The ROU asset equals the lease liability adjusted for any initial direct costs, prepaid rent and lease incentives. All of the Company’s leases are classified as operating leases. The leases include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. The Company made a policy election to not recognize leases with a lease term of 12 months or less in the combined balance sheet. Lease expense for these leases is recognized on a straight-line basis over the lease term.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets – Goodwill and indefinite-lived intangible assets are tested for impairment at least annually; however, these tests are performed more frequently when events or changes in circumstances indicate that the asset may be impaired. Impairment exists when carrying value exceeds fair value. Estimates of fair value are based on appraisals, market prices for comparable assets, or internal estimates of future net cash flows. Definite-lived intangible assets consist of customer relationships, licenses, permits and developed technology. The majority of these assets are being amortized using discounted estimated future cash flows over the term of the related agreements. Intangible assets associated with customer relationships are being amortized using the discounted estimated future cash flows method based upon assumed rates of annual customer attrition. We continually evaluate the reasonableness of the useful lives of these assets. Once these assets are fully amortized, they will be removed from the consolidated balance sheets. During 2019 we adopted new accounting guidance and removed the second step of the goodwill impairment test. Under step two, an entity was required to determine the fair value of individual assets and liabilities of a reporting unit (including unrecognized assets and liabilities) using the procedure for determining fair values in a business combination. As a result, goodwill impairment is now measured at the amount by which a reporting unit’s carrying amount exceeds its fair value, with any impairment charge limited to the carrying amount of goodwill.
Business Combinations and Related Business Acquisition Costs	Business Combinations and Related Business Acquisition Costs – Assets and liabilities associated with business acquisitions are recorded at fair value using the acquisition method of accounting. We allocate the purchase price of acquisitions based upon the fair value of each component which may be derived from various observable and unobservable inputs and assumptions. We may use third-party valuation specialists to assist us in this allocation. Initial purchase price allocations are preliminary and subject to revision within the measurement period, not to exceed one year from the date of acquisition. The fair value of property, plant and equipment and intangible assets are based upon the discounted cash flow method that involves inputs that are not observable in the market (Level 3). Goodwill assigned represents the amount of consideration transferred in excess of the fair value assigned to identifiable assets acquired and liabilities assumed. Business acquisition costs are expensed as incurred and are reported as general and administrative expenses in the consolidated statements of income. We define these costs to include finder’s fees, advisory, legal, accounting, valuation, and other professional consulting fees, as well as, travel associated with the evaluation and effort to acquire specific businesses.
Investment in AMAK	Investment in AMAK – Prior to the completion of the sale of our ownership interest in AMAK, we accounted for our investment in AMAK using the equity method of accounting under which we recorded in income our share of AMAK’s income or loss for each period. The amount recorded was also adjusted to reflect the amortization of certain differences between the basis in our investment in AMAK and our share of the net assets of AMAK was reflected in AMAK’s financial statements (see Note 6). Any proceeds received from or payments made to AMAK were recorded as decreases or increases in the balance of our investment.
Other Assets	Other Assets – Other assets include a license used in specialty petrochemicals operations, spare parts inventory, insurance receivables and certain specialty petrochemicals assets. Spare parts are accounted for using FIFO.
Long-Lived Assets Impairment	Long-Lived Assets Impairment – Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable based on the undiscounted net cash flows to be generated from the asset’s use. The amount of the impairment loss to be recorded is calculated by the excess of the asset’s carrying value over its fair value. Fair value is generally determined using a discounted cash flow analysis although other factors including the state of the economy are considered.
Revenue Recognition and Shipping and Handling Costs	Revenue Recognition – Revenue is measured based on a consideration specified in a contract with a customer. The Company recognizes revenue when it satisfies a performance obligation by transferring control over a product or service to a customer. In evaluating when a customer has control of the asset we primarily consider whether the transfer of legal title and physical delivery has occurred, whether the customer has significant risks and rewards of ownership, and whether the customer has accepted delivery and a right to payment exists. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from revenue. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are included in cost of product sales and processing. The Company does not offer material rights of return or service-type warranties. The following is a description of principal activities – separated by reportable segments – from which the Company generates its revenue. For more detailed information about reportable segments, disaggregation of revenues, and contract balance disclosures, see Note 17. Specialty Petrochemicals segment The Specialty Petrochemicals segment of the Company produces eight high purity hydrocarbons and other petroleum based products including isopentane, normal pentane, isohexane and hexane. These products are used in the production of polyethylene, packaging, polypropylene, expandable polystyrene, poly-iso/urethane foams, crude oil from the Canadian tar sands, and in the catalyst support industry. SHR’s specialty petrochemicals products are typically transported to customers by rail car, tank truck, iso-container and ship. Product Sales – The Company sells individual (distinct) products to its customers on a stand-alone basis (point-of-sale) without any further integration. There is no significant modification of any one or more products sold to fulfill another promised product or service within any of the Company’s product sale transactions. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment for prime product sales is typically due and collected 30 to 60 days subsequent to point of sale. Processing Fees – The Company’s services consist of processing customer supplied feedstocks into custom products including, if requested, services for forming, packaging, and arranging shipping. Pursuant to Tolling Agreements the customer retains title to the feedstocks and processed products. The performance obligation in each Tolling Agreement transaction is the processing of customer provided feedstocks into custom products and is satisfied over time. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment is typically due and collected within 30 days subsequent to point of sale. Specialty Waxes segment The Specialty Waxes segment of the Company manufactures and sells specialty polyethylene and poly alpha olefin waxes and also provides custom processing services for customers. Product Sales – The Company sells individual (distinct) products to its customers on a stand-alone basis (point-of-sale) without any further integration. There is no significant modification of any one or more products sold to fulfill another promised product or service within any of the Company’s product sale transactions. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment is typically due and collected within 30 days subsequent to point of sale. Processing Fees – The Company’s promised services consist of processing customer supplied feedstocks into custom products including, if requested, services for forming, packaging, and arranging shipping. Pursuant to Tolling Agreements and Purchase Order Arrangements, the customer typically retains title to the feedstocks and processed products. The performance obligation in each Tolling Agreement transaction and Purchase Order Arrangement is the processing of customer provided feedstocks into custom products and is satisfied over time. The amount of consideration received for product sales is stated within the executed invoice with the customer. Payment is typically due and collected within 30 days subsequent to point of sale. Shipping and Handling Costs – Shipping and handling costs are classified as cost of product sales and processing and are expensed as incurred.
Retirement Plan	Retirement Plan – We offer employees the benefit of participating in a 401(k) plan. We match 100% up to 6% of pay with vesting occurring over 2 years.
Environmental Liabilities	Environmental Liabilities – Remediation costs are accrued based on estimates of known environmental remediation exposure. Ongoing environmental compliance costs, including maintenance and monitoring costs, are expensed as incurred.
Other Liabilities	Other Liabilities – We periodically make changes in or expand our custom processing units at the request of the customer. The cost to make these changes is shared by the customer. Upon completion of a project a note receivable and a deferred liability are recorded to recover the project costs which are then capitalized. At times instead of a note receivable being established, the customer pays an upfront cost. The amortization of other liabilities is recorded as a reduction to depreciation expense over the life of the contract with the customer.
Net Income Per Share	Net Income Per Share – We compute basic income per common share based on the weighted-average number of common shares outstanding. Diluted income per common share is computed based on the weighted-average number of common shares outstanding plus the number of additional common shares that would have been outstanding if potential dilutive common shares, consisting of stock options, unvested restricted stock units, and shares which could be issued upon conversion of debt, had been issued (see Note 18).
Foreign Currency	Foreign Currency – The functional currency for the Company and each of the Company’s subsidiaries is the US dollar (USD). Transaction gains or losses as a result of transactions denominated and settled in currencies other than the USD are reflected in the statements of income as foreign exchange transaction gains or losses. We do not employ any practices to minimize foreign currency risks. The functional and reporting currency of AMAK is the Saudi Riyal (SR). In June 1986 the SR was officially pegged to the USD at a fixed exchange rate of 1 USD to 3.75 SR; therefore, we translate SR into our reporting currency of the USD for income statement and balance sheet purposes using the fixed exchange rate.
Management Estimates	Management Estimates – The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Significant estimates include allowance for doubtful accounts receivable and inventory obsolescence; assessment of impairment of our long-lived assets and intangible assets; litigation liabilities, post-retirement benefit obligations, guarantee obligations, environmental liabilities, and current and deferred income taxes. Actual results could differ from these estimates. In early 2020, the World Health Organization declared the rapidly spreading coronavirus disease (“COVID-19”) outbreak a pandemic. This pandemic has resulted in governments worldwide enacting emergency measures to combat the spread of the virus. The Company considered the impact of COVID-19 on the assumptions and estimates used and determined that there were no material adverse impacts on the Company’s results of operations and financial position at December 31, 2020. The Company is not aware of any specific event or circumstance that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of the date of issuance of the financial statements. These estimates may change, as new events occur and additional information is obtained.
Share-Based Compensation	Share-Based Compensation – We recognize share-based compensation of stock options granted based upon the fair value of options on the grant date using the Black-Scholes pricing model (see Note 15). Share-based compensation expense recognized during the period is based on the fair value of the portion of share-based payments awards that is ultimately expected to vest. Share-based compensation expense recognized in the consolidated statements of operations for the years ended December 31, 2020, 2019, and 2018 includes compensation expense based on the estimated grant date fair value for awards that are ultimately expected to vest, and accordingly has been reduced for estimated forfeitures. Estimated forfeitures at the time of grant are revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
Fair Value	Fair Value – The carrying value of cash and cash equivalents, trade receivables, taxes receivable, accounts payable, accrued liabilities, and other liabilities approximate fair value due to the immediate or short-term maturity of these financial instruments. The fair value of variable rate long term debt and notes payable reflect recent market transactions and approximate carrying value. We used other observable inputs that would qualify as Level 2 inputs to make our assessment of the approximate fair value of our cash and cash equivalents, trade receivables, taxes receivable, accounts payable, accrued liabilities, other liabilities, notes payable and variable rate long term debt. We measure fair value by ASC Topic 820 Fair Value. ASC Topic 820 defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements. ASC Topic 820 applies to reported balances that are required or permitted to be measured at fair value under existing accounting pronouncements; accordingly, the standard amends numerous accounting pronouncements but does not require any new fair value measurements of reported balances. ASC Topic 820 emphasizes that fair value, among other things, is based on exit price versus entry price, should include assumptions about risk such as nonperformance risk in liability fair values, and is a market-based measurement, not an entity-specific measurement. When considering the assumptions that market participants would use in pricing the asset or liability, ASC Topic 820 establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity’s own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). The fair value hierarchy prioritizes inputs used to measure fair value into three broad levels. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.
Income Taxes	Income Taxes – Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company maintains a valuation allowance for a deferred tax asset when it is deemed to be more likely than not that some or all of the deferred tax asset will not be realized. Our estimate of the potential outcome of any uncertain tax issues is subject to management’s assessment of relevant risks, facts, and circumstances existing at that time. We use a more likely than not threshold for financial statement recognition and measurement of tax position taken or expected to be taken in a tax return. To the extent that our assessment of such tax position changes, the change in estimate is recorded in the period in which the determination is made. We report tax-related interest and penalties as a component of income tax expense.
Subsequent Events	Subsequent Events – The Company has evaluated subsequent events through March 9, 2021, the date that the Consolidated Financial Statements were approved by management.
Recently Adopted Accounting Pronouncements and Recent Accounting Pronouncements Not Yet Adopted	Recently Adopted Accounting Pronouncements Effective January 1, 2020, we adopted Financial Accounting Standard Board (“FASB”) Accounting Standards Update (“ASU”) 2016-13, Measurement of Credit Losses on Financial Instruments, which changed the way entities recognize impairment of most financial assets. Short-term and long-term financial assets, as defined by the standard, are impacted by immediate recognition of estimated credit losses in the financial statements, reflecting the net amount expected to be collected. The adoption of this standard did not have a material impact on our Consolidated Financial Statements. Recent Accounting Pronouncements Not Yet Adopted In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (ASU 2019-12), which simplifies the accounting for income taxes. This guidance will be effective for us in the first quarter of 2021 on a prospective basis, and early adoption is permitted. The Company does not expect that the adoption of this guidance will have a material impact on our Consolidated Financial Statements. In March 2020, the FASB issued ASU No. 2020–04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting (ASU 2020-04), which provides guidance to alleviate the burden in accounting for reference rate reform by allowing certain expedients and exceptions in applying generally accepted accounting principles to contracts, hedging relationships, and other transactions impacted by reference rate reform. The provisions of ASU 2020-04 apply only to those transactions that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. This guidance is effective from March 12, 2020 through December 31, 2022 and adoption is optional. We are currently evaluating the impact of ASU 2020-04 on our Consolidated Financial Statements.

TRADE RECEIVABLES (Tables)

TRADE RECEIVABLES (Tables)	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Schedule of Trade Receivables, Net	Trade receivables, net, at December 31, consisted of the following: 2020 2019 (thousands of dollars) Trade receivables $ 25,601 $ 26,749 Less allowance for doubtful accounts (300) (429) Trade receivables, net $ 25,301 $ 26,320

INVENTORIES (Tables)

INVENTORIES (Tables)	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories include the following at December 31: 2020 2019 (thousands of dollars) Raw material $ 2,580 $ 2,100 Work in process 138 142 Finished products 10,227 11,382 Total inventory $ 12,945 $ 13,624

INVESTMENT IN AMAK AND DISCON_2

INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS (Tables)	12 Months Ended
	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Discontinued Operations	Included in discontinued operations are the following: Years Ended December 31, 2020 2019 2018 (thousands of dollars) Saudi administration and transaction expenses $ (2,452) $ (187) $ 136 Equity in earnings (losses) of AMAK 702 (986) (901) Gain (loss) on sale of equity interest 34,926 (1,473) — Income (loss) from discontinued operations before taxes 33,176 (2,646) (765) Tax (expense) benefit (6,967) 556 161 Income (loss) from discontinued operations, net of tax $ 26,209 $ (2,090) $ (604)
Summarized Results of Operation and Financial Position for AMAK	The summarized results of operations and financial position for AMAK are as follows: Results of Operations Nine Months Ended September 30, Year Ended December 31, 2020 2019 2018 (thousands of dollars) Sales $ 62,633 $ 78,350 $ 70,234 Cost of sales (55,728) (69,620) (68,084) Gross profit 6,905 8,730 2,150 Selling, general, and administrative (4,985) (13,047) (7,860) Operating income (loss) 1,920 (4,317) (5,710) Other (expense) income (346) 558 86 Finance and interest expense (1,211) (1,450) (1,592) Income (loss) before Zakat and income taxes 363 (5,209) (7,216) Zakat and income tax (expense) benefit (490) (1,801) 487 Net loss $ (127) $ (7,010) $ (6,729) Financial Position September 30, December 31, 2020 2019 (thousands of dollars) Current assets $ 29,799 $ 45,354 Noncurrent assets 209,814 196,564 Total assets $ 239,613 $ 241,918 Current liabilities $ 40,919 $ 27,645 Long term liabilities 79,122 79,348 Stockholders' equity 119,572 134,925 $ 239,613 $ 241,918
Equity in Income or Loss of AMAK Reflected on Consolidated Statements	The equity in the earnings (losses) of AMAK included in income (loss) from discontinued operations, net of tax, on the consolidated statements of operations for the years ended December 31, 2020, 2019, and 2018, is comprised of the following: Nine Months Ended September 30, Year Ended December 31, 2020 2019 2018 (thousands of dollars) AMAK Net Loss (127) (7,010) (6,729) Company’s share of loss reported by AMAK (308) * (1,996) (2,248) Amortization of difference between Company’s investment in AMAK and Company’s share of net assets of AMAK 1,010 1,010 1,347 Equity in earnings (losses) of AMAK 702 (986) (901) * Percentage of Ownership varies during the period.

PREPAID EXPENSES AND OTHER AS_2

PREPAID EXPENSES AND OTHER ASSETS (Tables)	12 Months Ended
	Dec. 31, 2020
Prepaid Expense and Other Assets, Current [Abstract]
Schedule of Prepaid Expenses and Other Assets	Prepaid expenses and other assets at December 31 are summarized as follows: 2020 2019 (thousands of dollars) Prepaid license $ 403 $ 1,209 Prepaid insurance 4,241 — Spare parts 2,376 1,857 Insurance receivable — 1,148 Cash held by AMAK (see Note 6) 1,877 — Other prepaid expenses and assets 301 733 Total $ 9,198 $ 4,947

PLANT, PIPELINE AND EQUIPMENT (

PLANT, PIPELINE AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Schedule of Plant, Pipeline and Equipment	Plant, pipeline and equipment include the following at December 31: 2020 2019 (thousands of dollars) Platinum catalyst $ 1,580 $ 1,580 Catalyst 4,325 4,095 Land 5,428 5,428 Plant, pipeline and equipment 270,149 258,651 Construction in progress 6,422 5,052 Total plant, pipeline and equipment 287,904 274,806 Less accumulated depreciation (100,800) (85,887) Net plant, pipeline and equipment $ 187,104 $ 188,919

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Schedule of Lease Cost	The components of lease expense were as follows: December 31, ($ in thousands) Classification in the Consolidated Statements of Operations 2020 2019 2018 Operating lease cost (a) Cost of sales, exclusive of depreciation and amortization $ 4,088 $ 4,361 $ — Operating lease cost (a) Selling, general and administrative 137 137 — Total operating lease cost $ 4,225 $ 4,498 $ — Finance lease cost: Amortization of right-of-use assets Depreciation — — — Interest on lease liabilities Interest Expense — — — Total finance lease cost $ — $ — $ — Total lease cost $ 4,225 $ 4,498 $ — (a) Short-term lease costs were approximately $0.5 million, $0.1 million and nil as of December 31, 2020, 2019 and 2018, respectively. December 31, ($ in thousands) 2020 2019 2018 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 3,713 $ 4,389 $ — Operating cash flows used for finance leases — — — Financing cash flows used for finance leases — — — Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 206 $ 81 $ — Finance leases — — — December 31, 2020 2019 Weighted-average remaining lease term (in years): Operating leases 3.7 4.5 Finance leases 0.0 0.0 Weighted-average discount rate: Operating leases 4.5 % 4.5 % Finance leases — % — %
Schedule of Lease Assets and Liabilities	December 31, ($ in thousands) Classification on the Consolidated Balance Sheets 2020 2019 Assets: Operating Operating lease assets $ 10,528 $ 13,512 Finance Property, plant, and equipment — — Total leased assets $ 10,528 $ 13,512 Liabilities: Current Operating Current portion of operating lease liabilities $ 3,195 $ 3,174 Finance Short-term debt and current portion of long-term debt — — Noncurrent Operating Operating lease liabilities 7,333 10,338 Finance Long-term debt — — Total lease liabilities $ 10,528 $ 13,512
Schedule of Operating Lease Maturities	As of December 31, 2020, maturities of lease liabilities were as follows: ($ in thousands) Operating Leases Finance Leases 2020 $ 3,590 $ — 2021 3,268 — 2022 2,376 — 2023 1,062 — 2024 991 — Thereafter 117 — Total lease payments $ 11,404 $ — Less: Interest 876 — Total lease obligations $ 10,528 $ —
Schedule of Finance Lease Maturities	As of December 31, 2020, maturities of lease liabilities were as follows: ($ in thousands) Operating Leases Finance Leases 2020 $ 3,590 $ — 2021 3,268 — 2022 2,376 — 2023 1,062 — 2024 991 — Thereafter 117 — Total lease payments $ 11,404 $ — Less: Interest 876 — Total lease obligations $ 10,528 $ —

GOODWILL AND INTANGIBLE ASSET_2

GOODWILL AND INTANGIBLE ASSETS, NET (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Finite-Lived Intangible Assets by Major Class	The following table summarizes the gross carrying amounts and accumulated amortization of intangible assets by major class (in thousands): December 31, 2020 Intangible assets subject to amortization Gross Accumulated Net Customer relationships $ 16,852 $ (7,022) $ 9,830 Non-compete agreements 94 (94) — Licenses and permits 1,471 (707) 764 Developed technology 6,131 (3,832) 2,299 Total $ 24,548 $ (11,655) $ 12,893 December 31, 2019 Intangible assets subject to amortization Gross Accumulated Net Customer relationships $ 16,852 $ (5,898) $ 10,954 Non-compete agreements 94 (94) — Licenses and permits 1,471 (601) 870 Developed technology 6,131 (3,219) 2,912 Total $ 24,548 $ (9,812) $ 14,736
Schedule of Expected Future Amortization Expenses	Based on identified intangible assets that are subject to amortization as of December 31, 2020, we expect future amortization expenses for each period to be as follows (in thousands): Total 2021 2022 2023 2024 2025 Thereafter Customer relationships $ 9,830 $ 1,123 $ 1,123 $ 1,123 $ 1,123 $ 1,123 $ 4,215 Licenses and permits 764 101 86 86 86 86 319 Developed technology 2,299 613 613 613 460 — — Total future amortization expense $ 12,893 $ 1,837 $ 1,822 $ 1,822 $ 1,669 $ 1,209 $ 4,534

ACCRUED LIABILITIES (Tables)

ACCRUED LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2020
Accrued Liabilities [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities at December 31 are summarized as follows: 2020 2019 (thousands of dollars) Accrued state taxes $ 125 $ — Accrued payroll 2,282 1,250 Accrued royalties 260 273 Accrued officer compensation 1,053 1,687 Accrued professional expenses 559 1,000 Accrued foreign taxes 1,054 — Other liabilities 1,524 1,532 Total $ 6,857 $ 5,742

LONG-TERM DEBT AND LONG-TERM _2

LONG-TERM DEBT AND LONG-TERM OBLIGATIONS (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Long-term Debt and Long-term Obligations	Long-term debt and long-term obligations at December 31 are summarized as follows: 2020 2019 (thousands of dollars) Revolving facility $ — $ 3,000 Term loan facility 46,563 80,938 Loan fees (468) (649) Total long-term debt 46,095 83,289 Less current portion including loan fees 4,194 4,194 Total long-term debt, less current portion including loan fees $ 41,901 $ 79,095

SHARE-BASED COMPENSATION (Table

SHARE-BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Summary of Status of Stock Option Awards and Warrants	A summary of the status of the Company’s stock option and warrant awards is as follows: Stock Options and Warrants Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Life Intrinsic Outstanding at January 1, 2020 487,000 $ 10.87 Granted — — Expired — — Exercised — — Forfeited — — Outstanding at December 31, 2020 487,000 $ 10.87 2.8 $ — Expected to vest — $ — 0.0 $ — Exercisable at December 31, 2020 487,000 $ 10.87 2.8 $ —
Schedule of Restricted Stock Units Activity	A summary of the status of the Company’s restricted stock units activity is as follows: Shares of Restricted Stock Units Weighted Average Grant Date Price per Share Outstanding at January 1, 2020 298,864 $ 9.78 Granted 364,637 6.32 Forfeited (15,571) 11.40 Vested (71,409) 8.40 Outstanding at December 31, 2020 576,521 $ 7.51 Expected to vest 576,521

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Provision for Income Taxes	The provision (benefit) for income taxes from continuing operations consisted of the following: Year ended December 31, 2020 2019 2018 (thousands of dollars) Current federal benefit $ (19,190) $ — $ (74) Current state expense 86 91 31 Deferred federal expense (benefit) 15,140 (3,564) (813) Deferred state expense (benefit) 1 (93) 210 Income tax expense (benefit) $ (3,963) $ (3,566) $ (646)
Schedule of Effective Income Tax Expense (Benefit)	The difference between the year ended effective tax rate in income tax expense (benefit) and the Federal statutory rate of 21% is as follows: 2020 2019 2018 (thousands of dollars) Income taxes at U.S. statutory rate $ 211 $ (3,455) $ (661) State taxes, net of federal benefit 71 256 234 Net operating loss carryback (4,655) — — Research and development credits (518) (203) (263) Permanent and other items 928 (164) 44 Total tax expense (benefit) $ (3,963) $ (3,566) $ (646)
Tax Effects of Temporary Differences	Tax effects of temporary differences that give rise to significant portions of federal and state deferred tax assets and deferred tax liabilities were as follows: December 31, 2020 2019 (thousands of dollars) Deferred tax liabilities: Plant, pipeline and equipment $ (31,119) $ (29,227) Other assets (31) (32) Operating lease asset (2,211) (2,838) Total deferred tax liabilities $ (33,361) $ (32,097) Deferred tax assets: Net operating loss carryforward — 11,685 Intangible assets 3,396 3,699 Operating lease liability 2,211 2,838 Stock-based compensation 956 1,093 Investment in AMAK — 589 Accounts receivable 65 240 Mineral interests 226 226 Interest expense carryforward — 211 General business credit — 140 Inventory 146 111 Post-retirement benefits 70 71 Charitable contributions — 45 Gross deferred tax assets 7,070 20,948 Valuation allowance (226) (226) Total net deferred tax assets $ 6,844 $ 20,722 Net deferred tax liabilities $ (26,517) $ (11,375)

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Segment Information	We also separately identify our corporate overhead which includes financing and administrative activities such as legal, accounting, consulting, investor relations, officer and director compensation, corporate insurance, and other administrative costs. Year Ended December 31, 2020 Specialty Petrochemicals Specialty Waxes Corporate Consolidated (in thousands) Net revenues $ 172,350 $ 36,276 $ — $ 208,626 Operating income (loss) before depreciation and amortization 26,438 1,762 (9,114) 19,086 Operating income (loss) 15,827 (3,760) (9,129) 2,938 Income (loss) from continuing operations before taxes 13,294 (3,606) (8,685) 1,003 Depreciation and amortization 10,611 5,522 16 16,149 Capital expenditures 11,334 2,017 — 13,351 Year Ended December 31, 2020 Specialty Petrochemicals Specialty Waxes Corporate Eliminations Consolidated (in thousands) Intangible assets, net $ — $ 12,893 $ — $ — $ 12,893 Total assets 298,198 83,108 127,260 (191,733) 316,833 Year Ended December 31, 2019 Specialty Petrochemicals Specialty Waxes Corporate Consolidated (in thousands) Net revenues $ 224,311 $ 34,648 $ — $ 258,959 Operating income (loss) before depreciation and amortization 38,860 (24,333) (9,190) 5,337 Operating income (loss) 28,304 (29,925) (9,242) (10,863) Income (loss) from continuing operations before taxes 23,993 (31,164) (9,279) (16,450) Depreciation and amortization 10,556 5,593 52 16,201 Capital expenditures 6,955 3,124 — 10,079 Year Ended December 31, 2019 Specialty Petrochemicals Specialty Waxes Corporate Eliminations Consolidated (in thousands) Intangible assets, net $ — $ 14,736 $ — $ — $ 14,736 Total assets 289,546 88,245 90,203 (166,175) 301,819

NET INCOME (LOSS) PER COMMON _2

NET INCOME (LOSS) PER COMMON SHARE (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share	Year ended December 31, 2020 2019 2018 (thousands of dollars, except per share amounts) Net Income per Common Share - Continuing Operations Net income (loss) from continuing operations $ 4,966 $ (12,884) $ (1,728) Basic income (loss) from continuing operations per common share: Weighted average shares outstanding 24,802 24,698 24,438 Per share amount (dollars) $ 0.20 $ (0.52) $ (0.07) Diluted income (loss) from continuing operations per common share: Weighted average shares outstanding 25,356 24,698 24,438 Per share amount (dollars) $ 0.20 $ (0.52) $ (0.07) Weighted average shares-denominator 24,802 24,698 24,438 Unvested restricted stock unit grant 554 — — Weighted average shares, as adjusted 25,356 24,698 24,438 Net Income per Common Share - Discontinued Operations Net income (loss) from discontinued operations $ 26,209 $ (2,090) $ (604) Basic income (loss) from discontinued operations per common share: Weighted average shares outstanding 24,802 24,698 24,438 Per share amount (dollars) $ 1.06 $ (0.08) $ (0.02) Diluted income (loss) from discontinued operations per common share: Weighted average shares outstanding 25,356 24,698 24,438 Per share amount (dollars) $ 1.03 $ (0.08) $ (0.02) Weighted average shares-denominator 24,802 24,698 24,438 Unvested restricted stock unit grant 554 — — Weighted average shares, as adjusted 25,356 24,698 24,438 Net Income per Common Share Net income (loss) $ 31,175 $ (14,974) $ (2,332) Basic income (loss) per common share: Weighted average shares outstanding 24,802 24,698 24,438 Per share amount (dollars) $ 1.26 $ (0.61) $ (0.10) Diluted income (loss) per common share: Weighted average shares outstanding 25,356 24,698 24,438 Per share amount (dollars) $ 1.23 $ (0.61) $ (0.10) Weighted average shares-denominator 24,802 24,698 24,438 Unvested restricted stock unit grant 554 — — Effect of dilutive stock options — — — Weighted average shares, as adjusted 25,356 24,698 24,438

QUARTERLY RESULTS OF OPERATIO_2

QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	The quarterly results of operations shown below are derived from unaudited financial statements for the eight quarters ended December 31, 2020 (in thousands, except per share data, rounding may apply): Year Ended December 31, 2020 First Quarter Second Quarter Third Quarter Fourth Quarter Total Revenues $ 62,067 $ 40,674 $ 47,747 $ 58,138 $ 208,626 Gross profit 8,078 6,167 8,457 5,976 28,678 Net income (loss) from continuing operations $ 5,863 $ (1,859) $ 1,108 $ (146) $ 4,966 Net income (loss) from discontinued operations, net of tax 4,857 (2) 21,324 30 26,209 Net income (loss) 10,720 (1,861) 22,432 (116) 31,175 Basic EPS (1) from continuing operations $ 0.24 $ (0.07) $ 0.04 $ (0.01) $ 0.20 Basic EPS (1) from discontinued operations 0.20 — 0.86 — 1.06 Basic EPS (1) 0.44 (0.07) 0.90 (0.01) 1.26 Diluted EPS (1) from continuing operations $ 0.23 $ (0.07) $ 0.04 $ (0.01) $ 0.20 Diluted EPS (1) from discontinued operations 0.19 — 0.84 — 1.03 Diluted EPS (1) 0.42 (0.07) 0.88 (0.01) 1.23 Year Ended December 31, 2019 First Quarter Second Quarter Third Quarter Fourth Quarter Total Revenues $ 65,155 $ 69,371 $ 62,715 $ 61,718 $ 258,959 Gross profit 10,073 10,565 9,567 8,310 38,515 Net income (loss) from continuing operations $ 1,797 $ 2,476 $ 1,583 $ (18,740) $ (12,884) Net income (loss) from discontinued operations, net of tax (46) (72) (1,002) (970) (2,090) Net income (loss) 1,751 2,404 581 (19,710) (14,974) Basic EPS (1) from continuing operations $ 0.07 $ 0.10 $ 0.06 $ (0.76) $ (0.52) Basic EPS (1) from discontinued operations — — (0.04) (0.04) (0.08) Basic EPS (1) 0.07 0.10 0.02 (0.80) (0.61) Diluted EPS (1) from continuing operations $ 0.07 $ 0.10 $ 0.06 $ (0.76) $ (0.52) Diluted EPS (1) from discontinued operations — — (0.04) (0.04) (0.08) Diluted EPS (1) 0.07 0.10 0.02 (0.80) (0.61) (1) Basic and diluted earnings per share are computed independently for each of the quarters presented based on the weighted average number of common shares outstanding during that period. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted earnings per share.

AMAK Organization and Business

AMAK Organization and Business (Tables)	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
Schedule of Ownership in Joint Stock Company	As of September 30, 2020, our ownership is as follows: Shares Ownership Saudi shareholders 53,936,081 73.1 ARMICO (Pan Arab Organization) 19,502,500 26.4 Other 361,419 0.5 73,800,000 100.0

AMAK Inventories (Tables)

AMAK Inventories (Tables)	12 Months Ended
	Dec. 31, 2020
Inventory [Line Items]
Inventories	Inventories include the following at December 31: 2020 2019 (thousands of dollars) Raw material $ 2,580 $ 2,100 Work in process 138 142 Finished products 10,227 11,382 Total inventory $ 12,945 $ 13,624
AMAK
Inventory [Line Items]
Inventories	Inventories consisted of the following at: September 30, December 31, 2020 2019 Stockpile ore 15,623,461 18,657,218 Ore concentrates 20,557,020 6,294,948 Precious metal dore 2,235,799 4,490,589 Explosives 484,169 326,599 Chemicals and other 6,117,375 5,507,986 45,017,824 35,277,340

AMAK Advances to Contractors _2

AMAK Advances to Contractors and Other (Tables)	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
Advances to Contractors and Other	Advances to contractors and other consisted of the following at: September 30, December 31, 2020 2019 Advances to contractors 13,668,562 42,672,136 Prepaid expenses 2,251,667 5,185,037 Other miscellaneous advances and receivables 4,730,086 2,195,845 20,650,315 50,053,018

AMAK Property and Equipment (Ta

AMAK Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and Equipment	Plant, pipeline and equipment include the following at December 31: 2020 2019 (thousands of dollars) Platinum catalyst $ 1,580 $ 1,580 Catalyst 4,325 4,095 Land 5,428 5,428 Plant, pipeline and equipment 270,149 258,651 Construction in progress 6,422 5,052 Total plant, pipeline and equipment 287,904 274,806 Less accumulated depreciation (100,800) (85,887) Net plant, pipeline and equipment $ 187,104 $ 188,919
AMAK
Property, Plant and Equipment [Line Items]
Property and Equipment	Property and equipment, net consisted of the following at: September 30, December 31, 2020 2019 Buildings 191,974,662 191,838,962 Leasehold improvements 4,051,062 1,838,317 Heavy equipment 146,801,861 136,066,275 Motor vehicles 22,753,563 22,467,300 Civil works 16,288,221 16,288,221 Tailings dam 23,900,160 23,900,160 Plant and machinery 332,014,825 326,974,958 Mining assets – rehabilitation costs 98,894,826 98,894,826 Mining assets – underground development costs 409,899,633 299,224,519 Construction in progress 3,356,625 4,789,313 1,249,935,438 1,122,282,851 Less accumulated depreciation, depletion and amortization (566,920,733) (511,648,419) 683,014,705 610,634,432

AMAK Development Costs (Tables)

AMAK Development Costs (Tables)	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
Development Costs, Net	Development costs, net consisted of the following at: September 30, December 31, 2020 2019 Cost 289,973,237 289,973,237 Accumulated amortization (191,033,512) (168,705,573) 98,939,725 121,267,664

AMAK Accounts Payable and Acc_2

AMAK Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
Accounts Payable and Accrued Liabilities	Accounts payable and accrued liabilities consisted of the following at: September 30, December 31, 2020 2019 Accounts payable and accrued liabilities 33,012,537 36,571,709 Accrued salaries and payroll 5,486,743 3,846,910 38,499,280 40,418,619

AMAK Zakat and Income Tax (Tabl

AMAK Zakat and Income Tax (Tables)	12 Months Ended
	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Components of Income Tax Benefit (Expense)	The provision (benefit) for income taxes from continuing operations consisted of the following: Year ended December 31, 2020 2019 2018 (thousands of dollars) Current federal benefit $ (19,190) $ — $ (74) Current state expense 86 91 31 Deferred federal expense (benefit) 15,140 (3,564) (813) Deferred state expense (benefit) 1 (93) 210 Income tax expense (benefit) $ (3,963) $ (3,566) $ (646)
Tax Effects of Temporary Differences	Tax effects of temporary differences that give rise to significant portions of federal and state deferred tax assets and deferred tax liabilities were as follows: December 31, 2020 2019 (thousands of dollars) Deferred tax liabilities: Plant, pipeline and equipment $ (31,119) $ (29,227) Other assets (31) (32) Operating lease asset (2,211) (2,838) Total deferred tax liabilities $ (33,361) $ (32,097) Deferred tax assets: Net operating loss carryforward — 11,685 Intangible assets 3,396 3,699 Operating lease liability 2,211 2,838 Stock-based compensation 956 1,093 Investment in AMAK — 589 Accounts receivable 65 240 Mineral interests 226 226 Interest expense carryforward — 211 General business credit — 140 Inventory 146 111 Post-retirement benefits 70 71 Charitable contributions — 45 Gross deferred tax assets 7,070 20,948 Valuation allowance (226) (226) Total net deferred tax assets $ 6,844 $ 20,722 Net deferred tax liabilities $ (26,517) $ (11,375)
AMAK
Schedule of Equity Method Investments [Line Items]
Components of Income Tax Benefit (Expense)	The components of Zakat and income tax expense (benefit) for the nine months ended September 30, 2020 and years ended December 31, 2019 and 2018 are as follows: 2020 2019 2018 Deferred income tax expense (benefit) (3,277,217) 1,737,276 (12,961,569) Change in valuation allowance (940,440) (1,312,403) 5,736,640 Current Zakat and income tax expense 6,054,522 6,326,283 5,400,000 Zakat and income tax expense (benefit) 1,836,865 6,751,156 (1,824,929)
Tax Effects of Temporary Differences	Tax effects of temporary differences that give rise to significant portions of non-Saudi owners deferred tax assets and deferred tax liabilities were as follows: September 30, December 31, 2020 2019 Deferred tax assets: Loss carryforward 40,645,080 41,293,547 Other 449,302 799,526 41,094,382 42,093,073 Deferred tax liabilities: Property and Equipment (4,509,734) (8,785,642) Net deferred tax asset 36,584,648 33,307,431 Valuation allowance (36,584,648) (37,525,089) Net deferred tax liability — (4,217,658)

AMAK Long-term Debt (Tables)

AMAK Long-term Debt (Tables) - AMAK	12 Months Ended
	Dec. 31, 2020
Debt Instrument [Line Items]
Summary of Long-Term Debts	Long-term debts are summarized as follows at: September 30, December 31, 2020 2019 SIDF 275,000,000 275,000,000 BSF 100,000,000 50,000,000 Deferred finance charges (5,873,053) (7,066,153) Total debt 369,126,947 317,933,847 Less current portion 97,500,000 50,000,000 Total long-term debt, less current portion 271,626,947 267,933,847
Repayment Schedule	The repayment schedule is as follows: Years Ending 2020 50,000,000 2021 86,666,668 2022 91,666,668 2023 96,666,664 2024 50,000,000 375,000,000

AMAK End-of-Service Indemniti_2

AMAK End-of-Service Indemnities (Tables)	12 Months Ended
	Dec. 31, 2020
AMAK
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Change in End-of-Service Indemnities Provision	The change in the end-of-service indemnities provision is as follows: September 30, December 31, 2020 2019 Balance, beginning of period 4,880,892 3,649,889 Provision 2,198,461 2,208,156 Paid (1,049,432) (977,153) Balance, end of period 6,029,921 4,880,892

AMAK Asset Retirement Obligat_2

AMAK Asset Retirement Obligations (Tables) - AMAK	12 Months Ended
	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Deferred Mine Closure Costs	Deferred mine closure costs consisted of the following at: September 30, December 31, 2020 2019 Cost 12,842,625 12,842,625 Accumulated amortization (7,993,376) (7,631,120) 4,849,249 5,211,505
Summary of Changes in Provision for Mine Closure Costs	A summary of changes in our provision for mine closure costs is as follows: September 30, December 31, 2020 2019 2018 Balance, beginning of period 16,625,347 16,063,136 15,519,938 Accretion expense 405,558 562,211 543,198 Balance, end of period 17,030,905 16,625,347 16,063,136

AMAK General and Administrati_2

AMAK General and Administrative Expenses (Tables)	12 Months Ended
	Dec. 31, 2020
AMAK
Schedule of Equity Method Investments [Line Items]
Summary of General and Administrative Expenses	A summary of general and administrative expenses is as follows: September 30, December 31, 2020 2019 2018 Wages, salaries and related costs 7,823,013 18,701,126 17,036,965 Mine closure and environmental 767,814 1,306,705 1,287,698 Office expenses and other 6,494,431 8,831,910 9,287,218 Travel and accommodation 85,721 27,182 593,046 Professional fees 3,522,068 1,488,500 1,271,071 18,693,047 30,355,423 29,475,998

AMAK Commitments and Continge_2

AMAK Commitments and Contingencies (Tables) - AMAK	12 Months Ended
	Dec. 31, 2020
Loss Contingencies [Line Items]
Operating leases, future minimum rental payments	A summary of these commitments are as follows: Years Ending 2020 247,500 2021 990,000 2022 990,000 2023 550,000 2024 550,000 2025 110,000 Thereafter 990,000 4,427,500
Schedule of Future Minimum Lease Payments for Capital Leases	The future minimum lease payments under the capital lease obligations as of September 30, 2020: 2020 723,727 2021 2,791,921 2022 1,482,543 Total minimum lease payments 4,998,191 Less deferred financial charges (496,193) Total capital lease obligations 4,501,998 Less: current portion of capital lease obligations 2,479,480 Total long term portion, net current portion 2,022,518

BUSINESS AND OPERATIONS OF TH_2

BUSINESS AND OPERATIONS OF THE COMPANY (Details)	Dec. 31, 2020
AMAK
Noncontrolling Interest [Line Items]
Ownership percentage	55.00%
PEVM
Noncontrolling Interest [Line Items]
Ownership percentage	33.00%

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2020USD ($)ر.س / $	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Accounting Policies [Abstract]
Allowance for doubtful accounts increase (decrease)	$ (129,000)	$ (23,000)	$ 152,000
Receivable write-offs	$ 129,000	0	0
Employer percent of match	100.00%
Employer percent match of gross pay	6.00%
Vesting period under 401(k) plan	2 years
Matching contributions on behalf of employees	$ 1,271,000	1,321,000	1,502,000
Reduction in depreciation expense due to amortization of capitalize liability	$ 821,000	$ 792,000	$ 787,000
Foreign exchange rate (SR per USD) | ر.س / $	3.75

CONCENTRATIONS OF REVENUES AN_2

CONCENTRATIONS OF REVENUES AND CREDIT RISK (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Accounts receivable	$ 25,301,000	$ 26,320,000
Undelivered feedstock	9,200,000	$ 12,400,000
FDIC insured amount	$ 250,000
Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk	15.40%	15.00%	13.50%
Revenue | Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk	24.00%	21.90%	25.50%
Accounts Receivable
Concentration Risk [Line Items]
Accounts receivable	$ 4,100,000	$ 4,900,000

TRADE RECEIVABLES (Details)

TRADE RECEIVABLES (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Trade receivables	$ 25,601	$ 26,749
Less allowance for doubtful accounts	(300)	(429)
Trade receivables, net	$ 25,301	$ 26,320

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw material	$ 2,580	$ 2,100
Work in process	138	142
Finished products	10,227	11,382
Total inventory	12,945	13,624
Inventory products in transit	$ 3,600	$ 2,900

INVESTMENT IN AMAK AND DISCON_3

INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS - Narrative (Details) ر.س in Millions, $ in Millions	Mar. 26, 2020SAR (ر.س)	Mar. 26, 2020USD ($)shares	Oct. 02, 2019	Sep. 22, 2019SAR (ر.س)	Sep. 22, 2019USD ($)	Sep. 30, 2020SAR (ر.س)	Sep. 30, 2020USD ($)shares	Dec. 31, 2020USD ($)ر.س / $	Jan. 01, 2021USD ($)	Sep. 28, 2020	Dec. 31, 2019USD ($)
Schedule of Equity Method Investments [Line Items]
Non refundable deposit forfeited prior to long stop date							50.00%
Equity method investment shares sold | shares							22,467,422
Proceeds from sales deposit of equity method investments		$ 0.5
Accrued income taxes							$ 1.1
Investment deposits forfeited							1.5	$ 1.5
Purchase price held by purchaser for tax obligations								$ 2.1
Foreign exchange rate (SR per USD) | ر.س / $								3.75
Saudi Industrial Development Fund Limited Guarantee
Schedule of Equity Method Investments [Line Items]
Loan guarantee percentage								41.00%
Foreign Tax Authority
Schedule of Equity Method Investments [Line Items]
Accrued income taxes		0.3
AMAK
Schedule of Equity Method Investments [Line Items]
Proceeds from sale of investment	ر.س 40	$ 10.7		ر.س 265	$ 70	ر.س 224	$ 59.9
Percentage investment in AMAK											33.30%
Investments in AMAK											$ 32.9
Non-refundable deposit of amount sold, percentage			5.00%			5.00%	5.00%
Equity method investment amount sold non refundable deposit							$ 3.5
Non refundable deposit forfeited prior to long stop date										50.00%
Equity method investment shares sold | shares		4,000,000
Foreign exchange rate (SR per USD) | ر.س / $								3.75
AMAK | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Accrued income taxes									$ 1.1
AMAK | Foreign Tax Authority
Schedule of Equity Method Investments [Line Items]
Foreign income tax expense (benefit), continuing operations								$ 0.2

INVESTMENT IN AMAK AND DISCON_4

INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS - Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations (net of tax)	$ 30	$ 21,324	$ (2)	$ 4,857	$ (970)	$ (1,002)	$ (72)	$ (46)	$ 26,209	$ (2,090)	$ (604)
Investment In Al Masane Al Kobra Mining Company (AMAK) | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Saudi administration and transaction expenses									(2,452)	(187)	136
Equity in earnings (losses) of AMAK									702	(986)	(901)
Gain (loss) on sale of equity interest									34,926	(1,473)	0
Loss from discontinued operations before taxes									33,176	(2,646)	(765)
Tax (expense) benefit									(6,967)	556	161
Discontinued operations (net of tax)									$ 26,209	$ (2,090)	$ (604)

INVESTMENT IN AMAK AND DISCON_5

INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS - Summary of Operating Results (Details) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Cost of sales										$ (179,948)	$ (220,444)	$ (260,114)
Gross profit	$ 5,976	$ 8,457	$ 6,167	$ 8,078	$ 8,310	$ 9,567	$ 10,565	$ 10,073		28,678	38,515	27,818
Operating income (loss)										2,938	(10,863)	2,199
Other (expense) income										(1,935)	(5,587)	(4,573)
Zakat and income tax (benefit)										(3,963)	(3,566)	(646)
Net income (loss)	$ (116)	$ 22,432	$ (1,861)	$ 10,720	$ (19,710)	$ 581	$ 2,404	$ 1,751		$ 31,175	(14,974)	(2,332)
AMAK
Schedule of Equity Method Investments [Line Items]
Sales									$ 62,633		78,350	70,234
Cost of sales									(55,728)		(69,620)	(68,084)
Gross profit									6,905		8,730	2,150
Selling, general, and administrative									(4,985)		(13,047)	(7,860)
Operating income (loss)									1,920		(4,317)	(5,710)
Other (expense) income									(346)		558	86
Finance and interest expense									(1,211)		(1,450)	(1,592)
Income (loss) before Zakat and income taxes									363		(5,209)	(7,216)
Zakat and income tax (benefit)									490		1,801	(487)
Net income (loss)									$ (127)		$ (7,010)	$ (6,729)

INVESTMENT IN AMAK AND DISCON_6

INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS - Summary of Financial Position (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Current assets	$ 105,896		$ 84,090
TOTAL ASSETS	316,833		301,819
Current liabilities	29,584		28,635
Stockholders' equity	204,407		171,443	$ 185,161	$ 185,011
TOTAL LIABILITIES AND EQUITY	$ 316,833		301,819
AMAK
Schedule of Equity Method Investments [Line Items]
Current assets		$ 29,799	45,354
Noncurrent assets		209,814	196,564
TOTAL ASSETS		239,613	241,918
Current liabilities		40,919	27,645
Long term liabilities		79,122	79,348
Stockholders' equity		119,572	134,925
TOTAL LIABILITIES AND EQUITY		$ 239,613	$ 241,918

INVESTMENT IN AMAK AND DISCON_7

INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS - Equity in the Income or Loss of Equity Method Investment (Details) - AMAK - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
AMAK Net Income (Loss)	$ (127)	$ (7,010)	$ (6,729)
Company's share of income (loss) reported by AMAK	(308)	(1,996)	(2,248)
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK	1,010	1,010	1,347
Equity in earnings (losses) of AMAK	$ 702	$ (986)	$ (901)

PREPAID EXPENSES AND OTHER AS_3

PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid license	$ 403	$ 1,209
Prepaid insurance	4,241	0
Spare parts	2,376	1,857
Insurance receivable	0	1,148
Cash held by AMAK	1,877	0
Other prepaid expenses and assets	301	733
Total	$ 9,198	$ 4,947

PLANT, PIPELINE AND EQUIPMENT_2

PLANT, PIPELINE AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization	$ 287,904	$ 274,806
Less accumulated depreciation	(100,800)	(85,887)
Net plant, pipeline and equipment	187,104	188,919
Interest capitalized for construction	0	0	$ 700
Capitalized labor costs	600	0	2,300
Amortization included in cost of sales	1,200	1,300	$ 100
Platinum catalyst
Property, Plant and Equipment [Line Items]
Total plant, pipeline and equipment	1,580	1,580
Catalyst
Property, Plant and Equipment [Line Items]
Total plant, pipeline and equipment	4,325	4,095
Land
Property, Plant and Equipment [Line Items]
Total plant, pipeline and equipment	5,428	5,428
Plant, pipeline and equipment
Property, Plant and Equipment [Line Items]
Total plant, pipeline and equipment	270,149	258,651
Construction in progress
Property, Plant and Equipment [Line Items]
Total plant, pipeline and equipment	$ 6,422	$ 5,052

LEASES - Components of Lease Ex

LEASES - Components of Lease Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Total operating lease cost	$ 4,225,000	$ 4,498,000	$ 0
Finance lease cost, amortization of right-of-use assets	0	0	0
Finance lease cost, interest on lease liabilities	0	0	0
Total finance lease cost	0	0	0
Total lease cost	4,225,000	4,498,000	0
Short-term lease costs	500,000	100,000	0
Variable lease costs	0
Cost of sales, exclusive of depreciation and amortization
Lessee, Lease, Description [Line Items]
Total operating lease cost	4,088,000	4,361,000	0
Selling, general and administrative
Lessee, Lease, Description [Line Items]
Total operating lease cost	$ 137,000	$ 137,000	$ 0

LEASES - Balance Sheet Classifi

LEASES - Balance Sheet Classifications (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating	$ 10,528	$ 13,512
Finance	0	0
Total leased assets	10,528	13,512
Current portion of operating lease liabilities	3,195	3,174
Current portion of finance lease liabilities	0	0
Operating lease liabilities, Noncurrent	7,333	10,338
Finance lease liabilities, Noncurrent	0	0
Total lease liabilities	$ 10,528	$ 13,512
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtCurrent	us-gaap:LongTermDebtCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtNoncurrent	us-gaap:LongTermDebtNoncurrent

LEASES - Cash Flow Classificati

LEASES - Cash Flow Classifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating cash flows used for operating leases	$ 3,713	$ 4,389	$ 0
Operating cash flows used for operating leases	0	0	0
Financing cash flows used for finance leases	0	0	0
Right-of-use assets obtained in exchange for lease obligations, Operating leases	206	81	0
Right-of-use assets obtained in exchange for lease obligations, Finance leases	$ 0	$ 0	$ 0

LEASES - Terms and Discount Rat

LEASES - Terms and Discount Rates (Details)	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Weighted-average remaining lease term, Operating leases (in years)	3 years 8 months 12 days	4 years 6 months
Weighted-average remaining lease term, Finance leases (in years)	0 years	0 years
Weighted-average discount rate, Operating leases	4.50%	4.50%
Weighted-average discount rate, Finance leases	0.00%	0.00%

LEASES - Maturities (Details)

LEASES - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2020	$ 3,590
2021	3,268
2022	2,376
2023	1,062
2024	991
Thereafter	117
Total lease payments	11,404
Less: Interest	876
Total lease obligations	10,528	$ 13,512
Finance Leases
2020	0
2021	0
2022	0
2023	0
2024	0
Thereafter	0
Total lease payments	0
Less: Interest	0
Total lease obligations	$ 0

GOODWILL AND INTANGIBLE ASSET_3

GOODWILL AND INTANGIBLE ASSETS, NET - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Amortization of intangible assets	$ 1,842	$ 1,856	$ 1,861
Specialty Waxes
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 24,200

GOODWILL AND INTANGIBLE ASSET_4

GOODWILL AND INTANGIBLE ASSETS, NET - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Intangible assets subject to amortization (Definite-lived)
Gross	$ 24,548	$ 24,548
Accumulated Amortization	(11,655)	(9,812)
Total	12,893	14,736
Customer relationships
Intangible assets subject to amortization (Definite-lived)
Gross	16,852	16,852
Accumulated Amortization	(7,022)	(5,898)
Total	9,830	10,954
Non-compete agreements
Intangible assets subject to amortization (Definite-lived)
Gross	94	94
Accumulated Amortization	(94)	(94)
Total	0	0
Licenses and permits
Intangible assets subject to amortization (Definite-lived)
Gross	1,471	1,471
Accumulated Amortization	(707)	(601)
Total	764	870
Developed technology
Intangible assets subject to amortization (Definite-lived)
Gross	6,131	6,131
Accumulated Amortization	(3,832)	(3,219)
Total	$ 2,299	$ 2,912

GOODWILL AND INTANGIBLE ASSET_5

GOODWILL AND INTANGIBLE ASSETS, NET - Expected Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Total	$ 12,893	$ 14,736
2021	1,837
2022	1,822
2023	1,822
2024	1,669
2025	1,209
Thereafter	4,534
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Total	9,830	10,954
2021	1,123
2022	1,123
2023	1,123
2024	1,123
2025	1,123
Thereafter	4,215
Licenses and permits
Finite-Lived Intangible Assets [Line Items]
Total	764	870
2021	101
2022	86
2023	86
2024	86
2025	86
Thereafter	319
Developed technology
Finite-Lived Intangible Assets [Line Items]
Total	2,299	$ 2,912
2021	613
2022	613
2023	613
2024	460
2025	0
Thereafter	$ 0

MINERAL PROPERTIES IN THE UNI_2

MINERAL PROPERTIES IN THE UNITED STATES (Details) $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2020USD ($)	Dec. 31, 2020apatent
Mineral Industries Disclosures [Abstract]
Number of patented mining claims in which PEVM has undivided interest		48
Number of unpatented mining claims in which PEVM has undivided interest		5
Area under patented and unpatented mining claims | a		1,500
Period when the property is unused		35 years
Sale contract deposit became non-refundable | $	$ 0.2

ACCRUED LIABILITIES (Details)

ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued Liabilities [Abstract]
Accrued state taxes	$ 125	$ 0
Accrued payroll	2,282	1,250
Accrued royalties	260	273
Accrued officer compensation	1,053	1,687
Accrued professional expenses	559	1,000
Accrued foreign taxes	1,054	0
Other liabilities	1,524	1,532
Total	$ 6,857	$ 5,742

LONG-TERM DEBT AND LONG-TERM _3

LONG-TERM DEBT AND LONG-TERM OBLIGATIONS - Narrative (Details) $ in Thousands	May 06, 2020USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Additional borrowing capacity			$ 50,000
Consolidated fixed charge coverage ratio, minimum required			1.15
Debt issuance costs			$ 468	$ 649
Unamortized debt issuance cost			500	600
Additions to CARES Act, PPP Loans			6,123	0	$ 0
ARC Agreement, Fourth Amendment
Debt Instrument [Line Items]
Debt issuance costs					900
ARC Agreement, Fourth Amendment | Revolving facility
Debt Instrument [Line Items]
Long-term debt			0	$ 3,000
Available remaining borrowing capacity			$ 52,400
Effective interest rate			2.63%
Amortization period			20 years
ARC Agreement, Fourth Amendment | TOCCO
Debt Instrument [Line Items]
Consolidated leverage ratio, minimum required			3.50
Consolidated leverage ratio			1.65	2.20
ARC Agreement, Fourth Amendment | Minimum | Revolving facility
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage			0.20%
ARC Agreement, Fourth Amendment | Minimum | Revolving facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.25%
ARC Agreement, Fourth Amendment | Minimum | Revolving facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate			0.25%
ARC Agreement, Fourth Amendment | Minimum | TOCCO
Debt Instrument [Line Items]
Consolidated fixed charge coverage ratio			1.80	2.56
ARC Agreement, Fourth Amendment | Maximum | Revolving facility
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage			0.375%
ARC Agreement, Fourth Amendment | Maximum | Revolving facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			2.50%
ARC Agreement, Fourth Amendment | Maximum | Revolving facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate			1.50%
ARC Agreement
Debt Instrument [Line Items]
Debt issuance costs					$ 300
ARC Agreement | Revolving facility
Debt Instrument [Line Items]
Available remaining borrowing capacity			$ 75,000
Acquisition Term Loan | Term loan facility
Debt Instrument [Line Items]
Borrowed funds under the agreement		$ 30,000
Repayments of lines of credit		$ 60,000
PPP Loans | CARES Act
Debt Instrument [Line Items]
Additions to CARES Act, PPP Loans	$ 6,100
Interest rate, stated percentage	1.00%
Term loan facility | ARC Agreement, Fourth Amendment
Debt Instrument [Line Items]
Long-term debt			46,563	$ 80,938
Borrowed funds under the agreement			$ 46,600

LONG-TERM DEBT AND LONG-TERM _4

LONG-TERM DEBT AND LONG-TERM OBLIGATIONS - Components of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Loan fees	$ (468)	$ (649)
Total long-term debt	46,095	83,289
Less current portion including loan fees	4,194	4,194
LONG-TERM DEBT, net of current portion	41,901	79,095
ARC Agreement, Fourth Amendment
Debt Instrument [Line Items]
Loan fees			$ (900)
Term loan facility | ARC Agreement, Fourth Amendment
Debt Instrument [Line Items]
Long-term debt, gross	46,563	80,938
Revolving facility | ARC Agreement, Fourth Amendment
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 3,000

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Undelivered feedstock	$ 9.2	$ 12.4
Shortfall fee expenses	1.1	0.6	$ 0.5
Mine closure and environmental	$ 0.9	$ 0.9	$ 0.7

SHARE-BASED COMPENSATION - Narr

SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2012	Jul. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 1,912,000	$ 1,250,000	$ 1,753,000
Share-based compensation reclassified		$ 300,000	$ 300,000
Stock Option Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)					1,000,000
Unrecognized compensation costs related to non-vested share-based compensation	$ 0
Stock Option Plans | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of expiration period	10 years
Granted (in shares)	0	0	0
Weighted average grant date fair value (in dollars per share)	$ 0
Proceeds from stock options exercised	$ 0	$ 0	$ 900,000
Shares issued upon option and warrant exercise (in shares)		11,000
Stock Option Plans | Stock Options and Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued during the period (in shares)	0	0	0
Granted (in shares)	0
Intrinsic value of options and warrants exercised	$ 0	$ 100,000	$ 2,600,000
Exercised in period (in shares)		85,000
Stock Option Plans | Mr. Hatem El Khalidi | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation reclassified			$ 700,000
Stock Option Plans | Common Stock | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options in the money (in shares)	100,000
The Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)				2,500,000
The Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs related to non-vested restricted share-based compensation	$ 1,300,000
Weighted average period compensation cost expected to be recognized	1 year 1 month 6 days
Minimum | Stock Option Plans | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Minimum | The Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Maximum | Stock Option Plans | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Maximum | The Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

SHARE-BASED COMPENSATION - Stoc

SHARE-BASED COMPENSATION - Stock Options and Warrant Awards (Details) - Stock Options and Warrants - Stock Option Plans - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Stock Options and Warrants
Outstanding at beginning of period (in shares)	487,000
Granted (in shares)	0
Expired (in shares)	0
Exercised (in shares)	0
Forfeited (in shares)	0
Outstanding at end of period (in shares)	487,000	487,000
Expected to vest (in shares)	0
Exercisable (in shares)	487,000
Weighted Average Exercise Price Per Share
Outstanding, beginning of period (in dollars per share)	$ 10.87	$ 10.87
Granted (in dollars per share)	0
Expired (in dollars per share)	0
Exercised (in dollars per share)	0
Forfeited (in dollars per share)	0
Expected to vest (in dollars per share)	0
Exercisable (in dollars per share)	$ 10.87
Weighted Average Remaining Contractual Life
Outstanding, contractual life	2 years 9 months 18 days
Expected to vest, contractual life	0 years
Exercisable, contractual life	2 years 9 months 18 days
Intrinsic Value
Outstanding, intrinsic value	$ 0
Expected to vest, intrinsic value	0
Exercisable, intrinsic value	$ 0

SHARE-BASED COMPENSATION - Rest

SHARE-BASED COMPENSATION - Restricted Stock and Restricted Stock Unit Awards (Details) - The Plan - Restricted Stock Units	12 Months Ended
	Dec. 31, 2020$ / sharesshares
Shares of Restricted Stock Units
Outstanding, beginning of period (in shares)	298,864
Granted (in shares)	364,637
Forfeited (in shares)	(15,571)
Vested (in shares)	(71,409)
Outstanding, end of period (in shares)	576,521
Expected to vest (in shares)	576,521
Weighted Average Grant Date Price per Share
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 9.78
Granted (in dollars per share) | $ / shares	6.32
Forfeited (in dollars per share) | $ / shares	11.40
Vested (in dollars per share) | $ / shares	8.40
Outstanding, end of period (in dollars per share) | $ / shares	$ 7.51

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details) - USD ($)	Mar. 27, 2020	Dec. 31, 2020	Dec. 31, 2019
Income Tax Contingency [Line Items]
Taxes receivable		$ 2,788,000	$ 182,000
Net operating loss carryforwards		1,300,000
Interest or penalties related to uncertain tax positions		0	$ 0
CARES Act
Income Tax Contingency [Line Items]
Security act provisional income tax benefit	$ 16,500,000
Taxes receivable		$ 14,100,000
Received interest income miscellaneous income (expense)	500,000
Refund claims made CARES act	$ 2,400,000

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current federal benefit	$ (19,190)	$ 0	$ (74)
Current state expense	86	91	31
Deferred federal expense (benefit)	15,140	(3,564)	(813)
Deferred state expense (benefit)	1	(93)	210
Income tax expense (benefit)	(3,963)	(3,566)	(646)
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income taxes at U.S. statutory rate	211	(3,455)	(661)
State taxes, net of federal benefit	71	256	234
Net operating loss carryback	(4,655)	0	0
Research and development credits	(518)	(203)	(263)
Permanent and other items	928	(164)	44
Income tax expense (benefit)	(3,963)	(3,566)	$ (646)
Deferred tax liabilities:
Plant, pipeline and equipment	(31,119)	(29,227)
Other assets	(31)	(32)
Operating lease asset	(2,211)	(2,838)
Total deferred tax liabilities	(33,361)	(32,097)
Deferred tax assets:
Net operating loss carryforward	0	11,685
Intangible assets	3,396	3,699
Operating lease liability	2,211	2,838
Stock-based compensation	956	1,093
Investment in AMAK	0	589
Accounts receivable	65	240
Mineral interests	226	226
Interest expense carryforward	0	211
General business credit	0	140
Inventory	146	111
Post-retirement benefits	70	71
Charitable contributions	0	45
Gross deferred tax assets	7,070	20,948
Valuation allowance	(226)	(226)
Total net deferred tax assets	6,844	20,722
Net deferred tax liabilities	$ (26,517)	$ (11,375)

SEGMENT INFORMATION (Details)

SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2020USD ($)Segment	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment									2
Net revenues	$ 58,138	$ 47,747	$ 40,674	$ 62,067	$ 61,718	$ 62,715	$ 69,371	$ 65,155	$ 208,626	$ 258,959	$ 287,932
Operating income (loss) before depreciation and amortization									19,086	5,337
Operating income (loss)									2,938	(10,863)	2,199
Income (loss) from continuing operations before taxes									1,003	(16,450)	$ (2,374)
Depreciation and amortization									16,149	16,201
Capital expenditures									13,351	10,079
Intangible assets, net	12,893				14,736				12,893	14,736
Total assets	316,833				301,819				316,833	301,819
Corporate
Segment Reporting Information [Line Items]
Net revenues									0	0
Operating income (loss) before depreciation and amortization									(9,114)	(9,190)
Operating income (loss)									(9,129)	(9,242)
Income (loss) from continuing operations before taxes									(8,685)	(9,279)
Depreciation and amortization									16	52
Capital expenditures									0	0
Intangible assets, net	0				0				0	0
Total assets	127,260				90,203				127,260	90,203
Eliminations
Segment Reporting Information [Line Items]
Intangible assets, net	0				0				0	0
Total assets	(191,733)				(166,175)				(191,733)	(166,175)
Specialty Petrochemicals | Operating Segments
Segment Reporting Information [Line Items]
Net revenues									172,350	224,311
Operating income (loss) before depreciation and amortization									26,438	38,860
Operating income (loss)									15,827	28,304
Income (loss) from continuing operations before taxes									13,294	23,993
Depreciation and amortization									10,611	10,556
Capital expenditures									11,334	6,955
Intangible assets, net	0				0				0	0
Total assets	298,198				289,546				298,198	289,546
Specialty Waxes | Operating Segments
Segment Reporting Information [Line Items]
Net revenues									36,276	34,648
Operating income (loss) before depreciation and amortization									1,762	(24,333)
Operating income (loss)									(3,760)	(29,925)
Income (loss) from continuing operations before taxes									(3,606)	(31,164)
Depreciation and amortization									5,522	5,593
Capital expenditures									2,017	3,124
Intangible assets, net	12,893				14,736				12,893	14,736
Total assets	$ 83,108				$ 88,245				$ 83,108	$ 88,245

NET INCOME (LOSS) PER COMMON _3

NET INCOME (LOSS) PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income (loss) from continuing operations									$ 4,966	$ (12,884)	$ (1,728)
Net income (loss) from discontinued operations									26,209	(2,090)	(604)
Net income (loss)									$ 31,175	$ (14,974)	$ (2,332)
Basic income (loss) per common share:
Weighted average shares outstanding (in shares)									24,802	24,698	24,438
Basic earnings (loss) per share, continuing operations (in dollars per share)	$ (0.01)	$ 0.04	$ (0.07)	$ 0.24	$ (0.76)	$ 0.06	$ 0.10	$ 0.07	$ 0.20	$ (0.52)	$ (0.07)
Basic earnings (loss) per share, discontinued operations (in dollars per share)	0	0.86	0	0.20	(0.04)	(0.04)	0	0	1.06	(0.08)	(0.02)
Per share amount (in dollars per share)	(0.01)	0.90	(0.07)	0.44	(0.80)	0.02	0.10	0.07	$ 1.26	$ (0.61)	$ (0.10)
Diluted income (loss) per common share:
Weighted average shares outstanding (in shares)									25,356	24,698	24,438
Diluted earnings (loss) per share, continuing operations (in dollars per share)	(0.01)	0.04	(0.07)	0.23	(0.76)	0.06	0.10	0.07	$ 0.20	$ (0.52)	$ (0.07)
Net income (loss) from discontinued operations, net of tax (in dollars per share)	0	0.84	0	0.19	(0.04)	(0.04)	0	0	1.03	(0.08)	(0.02)
Diluted earnings (loss) per share (in dollars per share)	$ (0.01)	$ 0.88	$ (0.07)	$ 0.42	$ (0.80)	$ 0.02	$ 0.10	$ 0.07	$ 1.23	$ (0.61)	$ (0.10)
Unvested restricted stock unit grant (in shares)									554	0	0
Effect of dilutive stock options (in shares)									0	0	0
Diluted weighted average number of common shares outstanding (in shares)									25,356	24,698	24,438

NET INCOME (LOSS) PER COMMON _4

NET INCOME (LOSS) PER COMMON SHARE (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common stock shares issuable (in shares)	0.5	0.5	0.7
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common stock shares issuable (in shares)	0.5

QUARTERLY RESULTS OF OPERATIO_3

QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 58,138	$ 47,747	$ 40,674	$ 62,067	$ 61,718	$ 62,715	$ 69,371	$ 65,155	$ 208,626	$ 258,959	$ 287,932
Gross profit	5,976	8,457	6,167	8,078	8,310	9,567	10,565	10,073	28,678	38,515	27,818
Net income (loss) from continuing operations	(146)	1,108	(1,859)	5,863	(18,740)	1,583	2,476	1,797	4,966	(12,884)	(1,728)
Net income (loss) from discontinued operations, net of tax	30	21,324	(2)	4,857	(970)	(1,002)	(72)	(46)	26,209	(2,090)	(604)
Net income (loss)	$ (116)	$ 22,432	$ (1,861)	$ 10,720	$ (19,710)	$ 581	$ 2,404	$ 1,751	$ 31,175	$ (14,974)	$ (2,332)
Basic EPS from continuing operations (in dollars per share)	$ (0.01)	$ 0.04	$ (0.07)	$ 0.24	$ (0.76)	$ 0.06	$ 0.10	$ 0.07	$ 0.20	$ (0.52)	$ (0.07)
Basic EPS from discontinued operations (in dollars per share)	0	0.86	0	0.20	(0.04)	(0.04)	0	0	1.06	(0.08)	(0.02)
Net income (loss) (in dollars per share)	(0.01)	0.90	(0.07)	0.44	(0.80)	0.02	0.10	0.07	1.26	(0.61)	(0.10)
Diluted EPS from continuing operations (in dollars per share)	(0.01)	0.04	(0.07)	0.23	(0.76)	0.06	0.10	0.07	0.20	(0.52)	(0.07)
Diluted EPS from discontinued operations (in dollars per share)	0	0.84	0	0.19	(0.04)	(0.04)	0	0	1.03	(0.08)	(0.02)
Net income (loss) (in dollars per share)	$ (0.01)	$ 0.88	$ (0.07)	$ 0.42	$ (0.80)	$ 0.02	$ 0.10	$ 0.07	$ 1.23	$ (0.61)	$ (0.10)

RELATED PARTY TRANSACTIONS (Det

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 0.1	$ 0.1	$ 0.1
Account payable, related parties	0.1	0
Chairman of the Board
Related Party Transaction [Line Items]
Consulting fees	$ 0	$ 0.1	$ 0.1

RESTRUCTURING AND SEVERANCE E_2

RESTRUCTURING AND SEVERANCE EXPENSES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and severance expenses	$ 0	$ 0	$ 2,347
Accounts Payable and Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Amount of restructuring that remains unpaid		$ 20

POST-RETIREMENT OBLIGATIONS (De

POST-RETIREMENT OBLIGATIONS (Details) - Postretirement Benefits - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation arrangement with individual, amount of post-retirement obligation outstanding	$ 300	$ 300
Defined benefit plan, benefits paid	$ 10	$ 20

VALUATION AND QUALIFYING ACCO_2

VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 225,622	$ 225,622	$ 225,622
Charged (credited) to earnings	0	0	0
Deductions	0	0	0
Ending balance	225,622	225,622	225,622
SEC Schedule, 12-09, Allowance, Credit Loss
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	429,000	452,000	300,000
Charged (credited) to earnings	0	(23,000)	152,000
Deductions	(129,000)	0	0
Ending balance	$ 300,000	$ 429,000	$ 452,000

AMAK FINANCIAL STATEMENTS - Bal

AMAK FINANCIAL STATEMENTS - Balance Sheets (Details) $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020SAR (ر.س)	Sep. 30, 2020SAR (ر.س)	Dec. 31, 2019USD ($)	Dec. 31, 2019SAR (ر.س)	Dec. 31, 2018SAR (ر.س)	Dec. 31, 2017SAR (ر.س)
Current assets:
Cash and cash equivalents | $	$ 55,664			$ 6,145
Accounts receivable, net | $	25,301			26,320
Inventories | $	12,945			13,624
Total current assets | $	105,896			84,090
Non-current assets:
Total assets | $	316,833			301,819
Current liabilities:
Zakat and income tax liability | $	125			0
Current portion of finance lease liabilities | $	0			0
Long-term debt, current portion | $	4,194			4,194
Total current liabilities | $	29,584			28,635
Non-current liabilities
Capital lease obligation, net of current portion			ر.س 2,022,518
Long-term debt, net of current portion and deferred finance costs | $	41,901			79,095
Deferred income taxes | $	26,517			11,375
Commitments and contingencies | $
Shareholders' equity
Share capital | $	2,483			2,475
Share premium | $	61,311			59,530
Accumulated deficit | $	140,324			109,149
Total Trecora Resources Stockholders' Equity | $	204,118			171,154
TOTAL LIABILITIES AND EQUITY | $	$ 316,833			$ 301,819
AMAK
Current assets:
Cash and cash equivalents		ر.س 29,452,821			ر.س 52,244,794
Restricted cash		7,935,905			0
Accounts receivable, net		8,688,925			29,643,472
Inventories		45,017,824	45,017,824		35,277,340
Advances to shareholders		0			2,859,341
Advances to contractors and other		20,650,315	20,650,315		50,053,018
Total current assets		111,745,790			170,077,965
Non-current assets:
PLANT, PIPELINE, AND EQUIPMENT, NET (Note 8)		683,014,705	683,014,705		610,634,432
Development costs, net		98,939,725			121,267,664
Deferred mine closure costs		4,849,249	4,849,249		5,211,505
Total non-current assets		786,803,679			737,113,601
Total assets		898,549,469			907,191,566
Current liabilities:
Accounts payable and accrued liabilities		38,499,280	38,499,280		40,418,619
Zakat and income tax liability		14,966,681			10,932,026
Current portion of finance lease liabilities		2,479,480			2,318,301
Long-term debt, current portion		97,500,000	97,500,000		50,000,000
Total current liabilities		153,445,441			103,668,946
Non-current liabilities
Provision for mine closure costs		17,030,905	17,030,905		16,625,347	ر.س 16,063,136	ر.س 15,519,938
Capital lease obligation, net of current portion		2,022,518			3,898,002
Long-term debt, net of current portion and deferred finance costs		271,626,947	271,626,947		267,933,847
End-of-service indemnities		6,029,921	ر.س 6,029,921		4,880,892	ر.س 3,649,889
Deferred income taxes		0			4,217,658
Total non-current liabilities		296,710,291			297,555,746
Commitments and contingencies
Shareholders' equity
Share capital		820,000,000			820,000,000
Share premium		(131,808,900)			(74,713,350)
Accumulated deficit		(239,797,363)			(239,319,776)
Total Trecora Resources Stockholders' Equity		448,393,737			505,966,874
TOTAL LIABILITIES AND EQUITY		ر.س 898,549,469			ر.س 907,191,566

AMAK FINANCIAL STATEMENTS - Sta

AMAK FINANCIAL STATEMENTS - Statements of Operations (Details) $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Sep. 30, 2020SAR (ر.س)	Dec. 31, 2020USD ($)	Dec. 31, 2020SAR (ر.س)	Dec. 31, 2019USD ($)	Dec. 31, 2019SAR (ر.س)	Dec. 31, 2018USD ($)	Dec. 31, 2018SAR (ر.س)
Schedule of Equity Method Investments [Line Items]
Revenues | $	$ 58,138	$ 47,747	$ 40,674	$ 62,067	$ 61,718	$ 62,715	$ 69,371	$ 65,155		$ 208,626		$ 258,959		$ 287,932
Costs of revenues | $										179,948		220,444		260,114
Gross Profit | $	5,976	8,457	6,167	8,078	8,310	9,567	10,565	10,073		28,678		38,515		27,818
General and administrative expenses | $										24,892		24,386		22,532
Operating income (loss) | $										2,938		(10,863)		2,199
Other income (expense)
Finance charges | $										(2,491)		(5,139)		(4,100)
Other income (expense) | $										595		232		(158)
Other (expense) income | $										(1,935)		(5,587)		(4,573)
Income (loss) from continuing operations before income tax benefit | $										1,003		(16,450)		(2,374)
Zakat and income tax (expense) benefit | $										3,963		3,566		646
Net income (loss) | $	$ (116)	$ 22,432	$ (1,861)	$ 10,720	$ (19,710)	$ 581	$ 2,404	$ 1,751		$ 31,175		$ (14,974)		$ (2,332)
AMAK
Schedule of Equity Method Investments [Line Items]
Revenues | ر.س											ر.س 234,872,562		ر.س 293,811,329		ر.س 263,377,273
Costs of revenues | ر.س											208,980,004		279,645,705		255,313,296
Gross Profit | ر.س											25,892,558		14,165,624		8,063,977
General and administrative expenses | ر.س									ر.س 18,693,047		18,693,047		30,355,423		29,475,998
Operating income (loss) | ر.س											7,199,511		(16,189,799)		(21,412,021)
Other income (expense)
Finance charges | ر.س											(4,539,975)		(5,436,532)		(5,969,821)
Other income (expense) | ر.س											(1,300,258)		2,091,152		323,575
Other (expense) income | ر.س											(5,840,233)		(3,345,380)		(5,646,246)
Income (loss) from continuing operations before income tax benefit | ر.س											1,359,278		(19,535,179)		(27,058,267)
Zakat and income tax (expense) benefit | ر.س									ر.س (1,836,865)		(1,836,865)		(6,751,156)		1,824,929
Net income (loss) | ر.س											ر.س (477,587)		ر.س (26,286,335)		ر.س (25,233,338)

AMAK FINANCIAL STATEMENTS - S_2

AMAK FINANCIAL STATEMENTS - Statements of Changes in Shareholders' Equity (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019SAR (ر.س)	Dec. 31, 2020USD ($)	Dec. 31, 2020SAR (ر.س)	Dec. 31, 2019USD ($)	Dec. 31, 2019SAR (ر.س)	Dec. 31, 2018USD ($)	Dec. 31, 2018SAR (ر.س)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance | $		$ 171,443		$ 185,161		$ 185,011
Issuance of share premium | $		0		11		284
Net loss | $		31,175		(14,974)		(2,332)
Balance | $		204,407		171,443		185,161
Share Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance | $		2,475		2,463		2,451
Issuance of share premium | $		3		11		2
Balance | $		2,483		2,475		2,463
Share Premium
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance | $		59,530		58,294		56,012
Issuance of share premium | $		(3)				127
Balance | $		61,311		59,530		58,294
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance | $		0		(8)		(196)
Issuance of share premium | $						155
Balance | $		0		0		(8)
Retained Earnings (Accumulated Deficit)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance | $		109,149		124,123		126,455
Net loss | $		31,175		(14,974)		(2,332)
Balance | $		$ 140,324		$ 109,149		$ 124,123
AMAK
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	ر.س 606,966,559		ر.س 505,966,874		ر.س 606,966,559		ر.س 629,746,317
Issuance of share premium							2,453,580
Conversion of share premium to share capital							0
Share repurchase	(74,713,000)		(57,095,550)		(74,713,350)
Net loss			(477,587)		(26,286,335)		(25,233,338)
Balance			448,393,737		505,966,874		606,966,559
AMAK | Share Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	820,000,000		820,000,000		820,000,000		780,000,000
Conversion of share premium to share capital							40,000,000
Balance			820,000,000		820,000,000		820,000,000
AMAK | Share Premium
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	0		0		0		37,546,420
Issuance of share premium							2,453,580
Conversion of share premium to share capital							(40,000,000)
Balance			0		0		0
AMAK | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	0		(74,713,350)		0		0
Share repurchase			(57,095,550)		(74,713,350)
Balance			(131,808,900)		(74,713,350)		0
AMAK | Retained Earnings (Accumulated Deficit)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	ر.س (213,033,441)		(239,319,776)		(213,033,441)		(187,800,103)
Net loss			(477,587)		(26,286,335)		(25,233,338)
Balance			ر.س (239,797,363)		ر.س (239,319,776)		ر.س (213,033,441)

AMAK FINANCIAL STATEMENTS - S_3

AMAK FINANCIAL STATEMENTS - Statements of Cash Flows (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2020SAR (ر.س)	Dec. 31, 2019USD ($)	Dec. 31, 2019SAR (ر.س)	Dec. 31, 2018USD ($)	Dec. 31, 2018SAR (ر.س)
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss) | $	$ (116)	$ 22,432	$ (1,861)	$ 10,720	$ (19,710)	$ 581	$ 2,404	$ 1,751	$ 31,175		$ (14,974)		$ (2,332)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Amortization of deferred finance costs | $									181		181		261
Deferred Income Taxes | $									14,553		(2,993)		(1,377)
Changes in operating assets and liabilities:
Accounts receivable | $									1,018		816		(1,485)
Inventories | $									680		2,914		1,911
Accounts payable and accrued liabilities | $									831		(4,944)		2,202
Net Cash Provided by Operating Activities | $									25,565		25,121		19,895
Cash flows from investing activities:
Additions to property and equipment | $									(13,351)		(10,079)		(25,285)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Borrowings from long-term debt | $									20,000		2,000		18,177
Payments on long-term debt | $									(57,375)		(21,375)		(15,354)
Net Cash (Used in) Provided by Financing Activities | $									(31,375)		(19,680)		3,683
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | $									49,519		(590)		3,707
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | $				$ 6,145				$ 6,735	6,145		6,735		3,028
CASH AND CASH EQUIVALENTS AT END OF YEAR | $	$ 55,664				$ 6,145				55,664		6,145		6,735
Supplemental cash flow information
Cash paid for interest | $									2,266		4,731		4,560
Cash paid for Zakat and income tax | $									$ (11,069)		$ 53		$ (4,182)
AMAK
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss)										ر.س (477,587)		ر.س (26,286,335)		ر.س (25,233,338)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization										77,148,251		113,949,259		125,507,864
Accretion of deferred mine closure costs										405,558		562,211		543,198
Amortization of deferred finance costs										1,193,100		1,675,135		2,175,902
Deferred Income Taxes										(4,217,658)		424,873		(7,224,929)
Forfeiture of non-refundable deposit										1,429,670		0		0
Changes in operating assets and liabilities:
Accounts receivable										20,954,547		(13,408,437)		(8,021,219)
Inventories										(9,740,484)		10,593,780		(18,644,188)
Advances to contractors and other										29,402,704		(30,884,252)		563,016
Accounts payable and accrued liabilities										(1,919,339)		11,661,674		6,084,327
Zakat and income tax liability										4,034,655		5,532,026		1,883,327
End-of-service indemnities										1,149,029		1,231,003		1,131,360
Net Cash Provided by Operating Activities										119,362,446		75,050,937		78,765,320
Cash flows from investing activities:
Additions to property and equipment										(126,838,330)		(48,246,282)		(28,945,309)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Issuance of share capital and premium										0		0		2,453,580
Payments on capital lease obligations										(1,714,305)		(1,059,694)		(72,788)
Repurchase of treasury stock										(55,665,879)		(22,151,322)		0
Borrowings from long-term debt										50,000,000		50,000,000		0
Payments on long-term debt										0		(30,000,000)		0
Net advances to shareholders										0		(2,859,341)		(53,015,844)
Net Cash (Used in) Provided by Financing Activities										(7,380,184)		(6,070,357)		(50,635,052)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS										(14,856,068)		20,734,298		(815,041)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR										52,244,794		31,510,496		32,325,537
CASH AND CASH EQUIVALENTS AT END OF YEAR										37,388,726		52,244,794		31,510,496
Supplemental cash flow information
Cash paid for interest										3,346,875		4,428,545		3,927,778
Cash paid for Zakat and income tax										2,019,868		6,086,073		3,212,813
Supplemental disclosure of non-cash items
Assets acquired through capital lease obligations										0		7,933,140		625,805
Advances to shareholders applied to treasury stock purchase										ر.س 1,429,671		ر.س 52,562,028		ر.س 0

AMAK Organization and Busines_2

AMAK Organization and Business - Narrative (Details) ر.س / shares in Units, $ in Millions

Aug. 10, 2020SAR (ر.س)shares

Apr. 01, 2020SAR (ر.س)

Mar. 26, 2020SAR (ر.س)

Mar. 26, 2020USD ($)

Oct. 02, 2019SAR (ر.س)

Sep. 22, 2019SAR (ر.س)

Sep. 22, 2019USD ($)

May 22, 1993SAR (ر.س)km²

Sep. 30, 2020SAR (ر.س)

Sep. 30, 2020USD ($)

Mar. 31, 2019SAR (ر.س)shares

Sep. 28, 2020

Dec. 31, 2020SAR (ر.س)shares

Dec. 31, 2019SAR (ر.س)shares

Dec. 31, 2018SAR (ر.س)shares

Dec. 31, 2016SAR (ر.س)ر.س / sharesshares

Dec. 31, 2015SAR (ر.س)shares

Dec. 31, 2013SAR (ر.س)ر.س / sharesshares

Dec. 31, 2011SAR (ر.س)ر.س / sharesshares

Oct. 31, 2018ر.س / sharesshares

Dec. 31, 2009SAR (ر.س)share_bundleshares

Schedule of Equity Method Investments [Line Items]

Authorized capital (in shares) | shares

40,000,000

40,000,000

Issued capital (in shares) | shares

24,800,000

24,600,000

AMAK

Schedule of Equity Method Investments [Line Items]

Authorized capital (in shares) | shares

450,000,000

Authorized capital, number of share bundles | share_bundle

45,000,000

Authorized capital, number of shares per bundle | shares

10

10

10

10

10

10

Capital issued for cash (as a percent)

50.00%

Capital issued for contribution of mining rights and assets (as a percent)

50.00%

Increase to authorized share capital (SR)

ر.س 40,000,000

ر.س 40,000,000

ر.س 190,000,000

ر.س 50,000,000

ر.س 50,000,000

Authorized share capital (SR)

ر.س 820,000,000

ر.س 780,000,000

ر.س 740,000,000

ر.س 550,000,000

ر.س 500,000,000

Issued capital (in shares) | shares

4,000,000

4,000,000

19,000,000

5,000,000

5,000,000

Price per share (SR per share) | ر.س / shares

ر.س 20

ر.س 30

ر.س 28

Share premium (SR)

ر.س 35,092,840

ر.س 100,000,000

ر.س 90,000,000

Increase to share premium for shares that were previously issued (SR)

ر.س 2,453,580

Approved repurchase amount (in shares) | shares

2,500,000

Approved repurchase price (SR per share) | ر.س / shares

ر.س 30

Advances to shareholders (SR)

ر.س 0

ر.س 2,859,341

Stock repurchases during period (in shares) | shares

2,490,445

Stock repurchased (SR)

ر.س 74,713,000

ر.س 57,095,550

ر.س 74,713,350

Non refundable deposit forfeited percentage

50.00%

Non refundable deposit forfeited

ر.س 1,429,726

Stock issued during period, shares (in shares) | shares

5,709,555

Purchase of assets

ر.س 57,095,550

Capital gain obligations

ر.س 7,878,000

Trecora | Loan payable | Loan due to the Ministry of Finance and National Economy

Schedule of Equity Method Investments [Line Items]

Aggregate amount

ر.س 41,250,000

Trecora | Al Masane mine

Schedule of Equity Method Investments [Line Items]

Mining rights, term

30 years

Mining rights, renewal period

20 years

Area of mine (in square kilometers) | km²

44

Surface rental per square kilometer per year

ر.س 10,000

Surface rental per year

ر.س 440,000

AMAK

Schedule of Equity Method Investments [Line Items]

Amount of investment sold

ر.س 264,700,000

Non-refundable deposit of amount sold, percentage

5.00%

5.00%

5.00%

Proceeds from sale of investment

ر.س 40,000,000

$ 10.7

ر.س 265,000,000

$ 70

ر.س 224,000,000

$ 59.9

AMAK | AMAK

Schedule of Equity Method Investments [Line Items]

Proceeds from sale of investment

ر.س 2,855,000

AMAK Organization and Busines_3

AMAK Organization and Business - Schedule of Ownership in Joint Stock Company (Details) - AMAK - shares	Dec. 31, 2020	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	55.00%
Saudi shareholders,Trecora, and ARMICO
Schedule of Equity Method Investments [Line Items]
Shares		73,800,000
Ownership Percentage		100.00%
Saudi shareholders
Schedule of Equity Method Investments [Line Items]
Shares		53,936,081
Ownership Percentage		73.10%
ARMICO (Pan Arab Organization)
Schedule of Equity Method Investments [Line Items]
Shares		19,502,500
Ownership Percentage		26.40%
Other
Schedule of Equity Method Investments [Line Items]
Shares		361,419
Ownership Percentage		0.50%

AMAK Summary of Significant A_2

AMAK Summary of Significant Accounting Policies (Details) ر.س in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020SAR (ر.س)	Dec. 31, 2020ر.س / $	Dec. 31, 2019SAR (ر.س)	Dec. 31, 2018SAR (ر.س)	Jun. 30, 1986
Property, Plant and Equipment [Line Items]
Foreign exchange rate (SR per USD) | ر.س / $		3.75
AMAK
Property, Plant and Equipment [Line Items]
Operating lease expense | ر.س	ر.س 2,531		ر.س 4,015	ر.س 1,619
Zakat tax rate		2.50%
Non-Saudi tax rate	20.00%	20.00%	20.00%	20.00%
AMAK | Riyals
Property, Plant and Equipment [Line Items]
Foreign exchange rate (SR per USD)					3.75
AMAK | Other assets | Minimum
Property, Plant and Equipment [Line Items]
Useful life		3 years
AMAK | Other assets | Maximum
Property, Plant and Equipment [Line Items]
Useful life		20 years

AMAK Liquidity and Capital Reso

AMAK Liquidity and Capital Resource (Details) - AMAK	12 Months Ended
	Dec. 31, 2020year
Schedule of Equity Method Investments [Line Items]
Number of consecutive years of net losses	3
Mining assets – rehabilitation costs | Minimum
Schedule of Equity Method Investments [Line Items]
Extension to life of mine	2 years
Mining assets – rehabilitation costs | Maximum
Schedule of Equity Method Investments [Line Items]
Extension to life of mine	3 years

AMAK Inventories (Details)

AMAK Inventories (Details) $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020SAR (ر.س)	Sep. 30, 2020SAR (ر.س)	Dec. 31, 2019USD ($)	Dec. 31, 2019SAR (ر.س)
Inventory [Line Items]
Inventories | $	$ 12,945			$ 13,624
AMAK
Inventory [Line Items]
Inventories		ر.س 45,017,824	ر.س 45,017,824		ر.س 35,277,340
AMAK | Stockpile ore
Inventory [Line Items]
Inventories			15,623,461		18,657,218
AMAK | Ore concentrates
Inventory [Line Items]
Inventories			20,557,020		6,294,948
AMAK | Precious metal dore
Inventory [Line Items]
Inventories			2,235,799		4,490,589
AMAK | Explosives
Inventory [Line Items]
Inventories			484,169		326,599
AMAK | Chemicals and other
Inventory [Line Items]
Inventories			ر.س 6,117,375		ر.س 5,507,986

AMAK Advances to Contractors _3

AMAK Advances to Contractors and Other (Details) - AMAK - SAR (ر.س)	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Advances to contractors		ر.س 13,668,562	ر.س 42,672,136
Prepaid expenses		2,251,667	5,185,037
Other miscellaneous advances and receivables		4,730,086	2,195,845
Advances to contractors and other	ر.س 20,650,315	ر.س 20,650,315	ر.س 50,053,018

AMAK Property and Equipment (De

AMAK Property and Equipment (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020SAR (ر.س)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019SAR (ر.س)	Dec. 31, 2018SAR (ر.س)	Dec. 31, 2020SAR (ر.س)	Dec. 31, 2019SAR (ر.س)
Property, Plant and Equipment [Line Items]
Depreciation, depletion and amortization expense | $		$ 16,149	$ 16,201
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross | $		$ 6,422	$ 5,052
AMAK
Property, Plant and Equipment [Line Items]
Property and equipment, gross	ر.س 1,249,935,438						ر.س 1,122,282,851
Less accumulated depreciation	(566,920,733)						(511,648,419)
Net plant, pipeline and equipment	683,014,705					ر.س 683,014,705	610,634,432
Depreciation, depletion and amortization expense	55,000,000			ر.س 79,000,000	ر.س 88,000,000
AMAK | Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	191,974,662						191,838,962
AMAK | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,051,062						1,838,317
AMAK | Heavy equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	146,801,861						136,066,275
AMAK | Motor vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	22,753,563						22,467,300
AMAK | Civil works
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,288,221						16,288,221
AMAK | Tailings dam
Property, Plant and Equipment [Line Items]
Property and equipment, gross	23,900,160						23,900,160
AMAK | Plant and machinery
Property, Plant and Equipment [Line Items]
Property and equipment, gross	332,014,825						326,974,958
AMAK | Mining assets – rehabilitation costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	98,894,826						98,894,826
AMAK | Mining assets – underground development costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	409,899,633						299,224,519
AMAK | Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	ر.س 3,356,625						ر.س 4,789,313

AMAK Development Costs (Details

AMAK Development Costs (Details) - AMAK - SAR (ر.س)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Cost	ر.س 289,973,237	ر.س 289,973,237
Accumulated amortization	(191,033,512)	(168,705,573)
Development costs, net	98,939,725	121,267,664
Amortization expenses related to development costs	ر.س 22,328,000	ر.س 34,014,000	ر.س 36,250,000

AMAK Accounts Payable and Acc_3

AMAK Accounts Payable and Accrued Liabilities (Details) - AMAK - SAR (ر.س)	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Accounts payable and accrued liabilities		ر.س 33,012,537	ر.س 36,571,709
Accrued salaries and payroll		5,486,743	3,846,910
Accounts payable and accrued liabilities	ر.س 38,499,280	ر.س 38,499,280	ر.س 40,418,619

AMAK Zakat and Income Tax - Com

AMAK Zakat and Income Tax - Components of Income Tax Benefit (Expense) (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020SAR (ر.س)	Dec. 31, 2020USD ($)	Dec. 31, 2020SAR (ر.س)	Dec. 31, 2019USD ($)	Dec. 31, 2019SAR (ر.س)	Dec. 31, 2018USD ($)	Dec. 31, 2018SAR (ر.س)
Income Tax Disclosure [Line Items]
Income tax expense (benefit) | $		$ (3,963)		$ (3,566)		$ (646)
AMAK
Income Tax Disclosure [Line Items]
Deferred income tax expense (benefit)	ر.س (3,277,217)				ر.س 1,737,276		ر.س (12,961,569)
Change in valuation allowance	(940,440)				(1,312,403)		5,736,640
Current Zakat and income tax expense	6,054,522				6,326,283		5,400,000
Income tax expense (benefit)	ر.س 1,836,865		ر.س 1,836,865		ر.س 6,751,156		ر.س (1,824,929)

AMAK Zakat and Income Tax - Nar

AMAK Zakat and Income Tax - Narrative (Details) ر.س in Thousands, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020SAR (ر.س)	Dec. 31, 2020USD ($)	Dec. 31, 2019SAR (ر.س)	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Tax loss carryforwards | $		$ 1.3
AMAK
Income Tax Disclosure [Line Items]
Statutory rate for non-Saudi shareholders	20.00%	20.00%	20.00%	20.00%
Tax loss carryforwards | ر.س	ر.س 203,225		ر.س 206,468

AMAK Zakat and Income Tax - Tax

AMAK Zakat and Income Tax - Tax Effects of Temporary Differences (Details) $ in Thousands	Dec. 31, 2020USD ($)	Sep. 30, 2020SAR (ر.س)	Dec. 31, 2019USD ($)	Dec. 31, 2019SAR (ر.س)
Deferred tax assets:
Loss carryforward | $	$ 0		$ 11,685
Gross deferred tax assets | $	7,070		20,948
Deferred tax liabilities:
Property and Equipment | $	(31,119)		(29,227)
Valuation allowance | $	(226)		(226)
Net deferred tax liabilities | $	$ (26,517)		$ (11,375)
AMAK
Deferred tax assets:
Loss carryforward		ر.س 40,645,080		ر.س 41,293,547
Other		449,302		799,526
Gross deferred tax assets		41,094,382		42,093,073
Deferred tax liabilities:
Property and Equipment		(4,509,734)		(8,785,642)
Net deferred tax asset		36,584,648		33,307,431
Valuation allowance		(36,584,648)		(37,525,089)
Net deferred tax liabilities		ر.س 0		ر.س (4,217,658)

AMAK Long-term Debt - Narrative

AMAK Long-term Debt - Narrative (Details) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2019SAR (ر.س)	Sep. 30, 2019SAR (ر.س)	Dec. 31, 2020USD ($)	Dec. 31, 2020SAR (ر.س)	Dec. 31, 2019USD ($)	Dec. 31, 2019SAR (ر.س)	Dec. 31, 2018USD ($)	Dec. 31, 2018SAR (ر.س)	Sep. 30, 2020SAR (ر.س)	Dec. 31, 2019SAR (ر.س)	Dec. 31, 2010SAR (ر.س)
Debt Instrument [Line Items]
Loan fees | $			$ 468		$ 649
Amortization of deferred finance costs | $			$ 181		$ 181		$ 261
AMAK
Debt Instrument [Line Items]
Loan fees									ر.س 5,873,053	ر.س 7,066,153
Amortization of deferred finance costs				ر.س 1,193,100		ر.س 1,675,135		ر.س 2,175,902
Loan agreement with SIDF | AMAK
Debt Instrument [Line Items]
Company received additional proceeds financing to SIDF	ر.س 50,000,000
Banque Saudi Fransi (BSF) Credit Facility | AMAK
Debt Instrument [Line Items]
Credit facility										110,518,400
Proceeds from credit facility	50,000,000
Periodic payment on credit facility	4,167,000
Company repaid BSF related to financing to SIDF	ر.س 50,000,000
Secured Debt | Loan agreement with SIDF | AMAK
Debt Instrument [Line Items]
Collateralized loan agreement											ر.س 330,000,000
Loan fees									ر.س 5,873,056	ر.س 7,066,153
Amortization of deferred finance costs		ر.س 835,000				ر.س 1,639,000
Loan agreement collateralized assets											ر.س 35,000,000
Saudi Arabian Interbank Offered Rate (SAIBOR) | Line of Credit [Member] | Banque Saudi Fransi (BSF) Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate					2.50%	2.50%

AMAK Long-term Debt - Summary o

AMAK Long-term Debt - Summary of Long-Term Debts (Details) $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020SAR (ر.س)	Sep. 30, 2020SAR (ر.س)	Dec. 31, 2019USD ($)	Dec. 31, 2019SAR (ر.س)
Debt Instrument [Line Items]
Deferred finance charges | $	$ (468)			$ (649)
Total long-term debt | $	46,095			83,289
Long-term debt, current portion | $	4,194			4,194
Total long-term debt, less current portion | $	$ 41,901			$ 79,095
AMAK
Debt Instrument [Line Items]
Long-term debt			ر.س 275,000,000		ر.س 275,000,000
BSF			100,000,000		50,000,000
Deferred finance charges			(5,873,053)		(7,066,153)
Total long-term debt			369,126,947		317,933,847
Long-term debt, current portion		ر.س 97,500,000	97,500,000		50,000,000
Total long-term debt, less current portion		ر.س 271,626,947	ر.س 271,626,947		ر.س 267,933,847

AMAK Long-term Debt - Repayment

AMAK Long-term Debt - Repayment Schedule (Details) - AMAK	Dec. 31, 2020SAR (ر.س)
Years Ending December 31,
2020	ر.س 50,000,000
2021	86,666,668
2022	91,666,668
2023	96,666,664
2023	50,000,000
Total debt	ر.س 375,000,000

AMAK End-of-Service Indemniti_3

AMAK End-of-Service Indemnities (Details) - AMAK - SAR (ر.س)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
End-Of-Service Indemnities [Roll Forward]
Balance, beginning of period	ر.س 4,880,892	ر.س 3,649,889
Provision	2,198,461	2,208,156
Paid	(1,049,432)	(977,153)
Balance, end of period	ر.س 6,029,921	ر.س 4,880,892

AMAK Asset Retirement Obligat_3

AMAK Asset Retirement Obligations - Narrative (Details) - AMAK - SAR (ر.س) ر.س in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
ARO recorded for deferred mine closure costs				ر.س 12,843
Amortization expense	ر.س 362	ر.س 541	ر.س 745

AMAK Asset Retirement Obligat_4

AMAK Asset Retirement Obligations - Deferred Mine Closure Costs (Details) - AMAK - SAR (ر.س)	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Cost		ر.س 12,842,625	ر.س 12,842,625
Accumulated amortization		(7,993,376)	(7,631,120)
Deferred mine closure costs, net	ر.س 4,849,249	ر.س 4,849,249	ر.س 5,211,505

AMAK Asset Retirement Obligat_5

AMAK Asset Retirement Obligations - Summary of Changes in Provision for Mine Closure Costs (Details) - AMAK - SAR (ر.س)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance, beginning of period	ر.س 16,625,347	ر.س 16,063,136	ر.س 15,519,938
Accretion expense	405,558	562,211	543,198
Balance, end of period	ر.س 17,030,905	ر.س 16,625,347	ر.س 16,063,136

AMAK General and Administrati_3

AMAK General and Administrative Expenses (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020SAR (ر.س)	Dec. 31, 2020USD ($)	Dec. 31, 2020SAR (ر.س)	Dec. 31, 2019USD ($)	Dec. 31, 2019SAR (ر.س)	Dec. 31, 2018USD ($)	Dec. 31, 2018SAR (ر.س)
Schedule of Equity Method Investments [Line Items]
Mine closure and environmental | $		$ 900		$ 900		$ 700
General and administrative expenses | $		$ 24,892		$ 24,386		$ 22,532
AMAK
Schedule of Equity Method Investments [Line Items]
Wages, salaries and related costs	ر.س 7,823,013				ر.س 18,701,126		ر.س 17,036,965
Mine closure and environmental	767,814				1,306,705		1,287,698
Office expenses and other	6,494,431				8,831,910		9,287,218
Travel and accommodation	85,721				27,182		593,046
Professional fees	3,522,068				1,488,500		1,271,071
General and administrative expenses	ر.س 18,693,047		ر.س 18,693,047		ر.س 30,355,423		ر.س 29,475,998

AMAK Commitments and Continge_3

AMAK Commitments and Contingencies - Operating Lease Obligations (Details)	Dec. 31, 2020SAR (ر.س)
Mining assets – rehabilitation costs
Operating Leased Assets [Line Items]
Term of lease commitment	30 years
Term of lease renewal	20 years
Guyan | Mining assets – rehabilitation costs
Operating Leased Assets [Line Items]
Term of lease commitment	20 years
AMAK
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2020	ر.س 247,500
2021	990,000
2022	990,000
2023	550,000
2024	550,000
2025	110,000
Thereafter	990,000
Total	ر.س 4,427,500

AMAK Commitments and Continge_4

AMAK Commitments and Contingencies - Capital Lease Obligations (Details)	Sep. 30, 2020SAR (ر.س)
Commitments and Contingencies Disclosure [Abstract]
2020	ر.س 723,727
2021	2,791,921
2022	1,482,543
Total minimum lease payments	4,998,191
Less deferred financial charges	(496,193)
Total capital lease obligations	4,501,998
Less: current portion of capital lease obligations	2,479,480
Total long term portion, net current portion	ر.س 2,022,518