Trecora Resources (TREC) 10-Q 6 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 02, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	TRECORA RESOURCES
Entity Central Index Key	7,039
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		24,486,654
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current Assets
Cash	$ 3,387	$ 3,028
Trade receivables, net	26,467	25,779
Insurance receivable	493	0
Inventories	17,003	18,450
Prepaid expenses and other assets	5,188	4,424
Taxes receivable	1,291	5,584
Total current assets	53,829	57,265
Plant, pipeline and equipment, net	192,084	181,742
Goodwill	21,798	21,798
Intangible assets, net	19,877	20,808
Investment in AMAK	45,452	45,125
Mineral properties in the United States	588	588
TOTAL ASSETS	333,628	327,326
Current Liabilities
Accounts payable	11,927	18,347
Accrued liabilities	5,638	3,961
Current portion of post-retirement benefit	28	305
Current portion of long-term debt	8,061	8,061
Current portion of other liabilities	916	870
Total current liabilities	26,570	31,544
Long-term debt, net of current portion	97,015	91,021
Post-retirement benefit, net of current portion	365	897
Other liabilities, net of current portion	1,297	1,611
Deferred income taxes	18,315	17,242
Total liabilities	143,562	142,315
EQUITY
Common stock‑authorized 40 million shares of $.10 par value; issued 24.5 million in 2018 and 2017 and outstanding 24.3 million shares in 2018 and 2017	2,451	2,451
Additional paid-in capital	56,365	56,012
Common stock in treasury, at cost	(61)	(196)
Retained earnings	131,022	126,455
Total Trecora Resources Stockholders' Equity	189,777	184,722
Noncontrolling Interest	289	289
Total equity	190,066	185,011
TOTAL LIABILITIES AND EQUITY	$ 333,628	$ 327,326

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
EQUITY
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares issued (in shares)	24,500,000	24,500,000
Common stock, shares outstanding (in shares)	24,300,000	24,300,000

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
REVENUES
REVENUES	$ 68,106	$ 62,115	$ 139,847	$ 117,657
OPERATING COSTS AND EXPENSES
Cost of Sales and Processing (including depreciation and amortization of $2,837, $2,363, $5,667, and $4,746, respectively)	59,964	51,008	121,565	95,932
GROSS PROFIT	8,142	11,107	18,282	21,725
GENERAL AND ADMINISTRATIVE EXPENSES
General and Administrative	4,554	5,740	10,889	11,961
Depreciation	191	205	387	410
GENERAL AND ADMINISTRATIVE EXPENSES	4,745	5,945	11,276	12,371
OPERATING INCOME	3,397	5,162	7,006	9,354
OTHER INCOME (EXPENSE)
Interest Income	14	0	21	0
Interest Expense	(815)	(678)	(1,693)	(1,314)
Equity in Earnings (Losses) of AMAK	228	(3,298)	458	(4,264)
Miscellaneous Expense	(13)	(22)	(39)	(64)
OTHER INCOME (EXPENSE)	(586)	(3,998)	(1,253)	(5,642)
INCOME BEFORE INCOME TAXES	2,811	1,164	5,753	3,712
INCOME TAXES	596	332	1,186	1,393
NET INCOME	2,215	832	4,567	2,319
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST	0	0	0	0
NET INCOME ATTRIBUTABLE TO TRECORA RESOURCES	$ 2,215	$ 832	$ 4,567	$ 2,319
Basic Earnings per Common Share
Net Income Attributable to Trecora Resources (in dollars per share)	$ 0.09	$ 0.03	$ 0.19	$ 0.10
Basic Weighted Average Number of Common Shares Outstanding (in shares)	24,370	24,256	24,354	24,248
Diluted Earnings per Common Share
Net Income Attributable to Trecora Resources (in dollars per share)	$ 0.09	$ 0.03	$ 0.18	$ 0.09
Diluted Weighted Average Number of Common Shares Outstanding (in shares)	25,014	25,034	25,119	25,044
Petrochemical and Product Sales [Member]
REVENUES
REVENUES	$ 63,569	$ 57,016	$ 130,268	$ 107,915
Processing Fees [Member]
REVENUES
REVENUES	$ 4,537	$ 5,099	$ 9,579	$ 9,742

CONSOLIDATED STATEMENTS OF INC5

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
OPERATING COSTS AND EXPENSES
Depreciation and amortization	$ 2,837	$ 2,363	$ 5,667	$ 4,746

CONSOLIDATED STATEMENT OF STOCK

CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) - 6 months ended Jun. 30, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Total [Member]	Non-Controlling Interest [Member]	Director [Member]	Director [Member]Additional Paid-In Capital [Member]	Director [Member]Total [Member]	Employees [Member]	Employees [Member]Additional Paid-In Capital [Member]	Employees [Member]Total [Member]
Equity, beginning balance (in shares) at Dec. 31, 2017	24,300	24,311
Equity, beginning balance at Dec. 31, 2017	$ 185,011	$ 2,451	$ 56,012	$ (196)	$ 126,455	$ 184,722	$ 289
Stock Options
Issued to Directors and Employees								$ (10)	$ (10)	$ (10)	$ 154	$ 154	$ 154
Cancellations (see Note 13)	(680)		(680)			(680)
Restricted Stock Units
Issued to Directors	175		175			175
Issued to Employees	734		734			734
Common Stock
Issued to Directors	(41)		(78)	37		(41)
Issued to Employees	286		132	154		286
Stock Exchange (see Notes 8 & 17)	(130)		(65)	(65)		(130)
Warrants			(9)	9
Net Income	$ 4,567				4,567	4,567
Equity, ending balance (in shares) at Jun. 30, 2018	24,300	24,311
Equity, ending balance at Jun. 30, 2018	$ 190,066	$ 2,451	$ 56,365	$ (61)	$ 131,022	$ 189,777	$ 289

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
OPERATING ACTIVITIES
Net Income	$ 4,567	$ 2,319
To Net Cash Provided by Operating Activities:
Depreciation and Amortization	4,941	4,226
Amortization of Intangible Assets	931	931
Unrealized Gain on Derivative Instruments	0	(38)
Stock-based Compensation	372	1,289
Deferred Income Taxes	1,073	505
Postretirement Obligation	(809)	(5)
Equity in (Earnings) Losses of AMAK	(458)	4,264
Bad Debt Expense	128	0
Amortization of Loan Fees	161	61
Changes in Operating Assets and Liabilities:
Increase in Trade Receivables	(817)	(2,839)
Increase in Insurance Receivables	(493)	0
Decrease in Taxes Receivable	4,293	783
Decrease in Inventories	1,448	2,752
(Increase) Decrease in Prepaid Expenses and Other Assets	(901)	36
Increase (Decrease) in Accounts Payable and Accrued Liabilities	(4,742)	114
Increase in Other Liabilities	104	1,129
Net Cash Provided by Operating Activities	9,798	15,527
INVESTING ACTIVITIES
Additions to Plant, Pipeline and Equipment	(15,434)	(27,833)
Advances to AMAK, net	(83)	(55)
Cash Used in Investing Activities	(15,517)	(27,888)
FINANCING ACTIVITIES
Issuance of Common Stock	0	25
Net Cash Received (Paid) Related to Stock-Based Compensation	245	(55)
Addition to Long-Term Debt	16,000	12,000
Repayment of Long-Term Debt	(10,167)	(6,250)
Net Cash Provided by Financing Activities	6,078	5,720
NET INCREASE (DECREASE) IN CASH	359	(6,641)
CASH AT BEGINNING OF PERIOD	3,028	8,389
CASH AT END OF PERIOD	3,387	1,748
Supplemental disclosure of cash flow information:
Cash payments for interest	2,394	2,721
Cash payments for taxes, net of refunds	92	220
Supplemental disclosure of non-cash items:
Capital expansion amortized to depreciation expense	210	435
Stock exchange (Notes 8 & 17)	$ 130	$ 0

GENERAL

GENERAL	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
GENERAL	GENERAL Organization Trecora Resources (the "Company") was incorporated in the State of Delaware in 1967. Our principal business activities are the manufacturing of various specialty hydrocarbons and synthetic waxes and the provision of custom processing services. Unless the context requires otherwise, references to "we," "us," "our," and the "Company" are intended to mean Trecora Resources and its subsidiaries. This document includes the following abbreviations: (1) TREC – Trecora Resources (2) TOCCO – Texas Oil & Chemical Co. II, Inc. – Wholly owned subsidiary of TREC and parent of SHR and TC (3) SHR – South Hampton Resources, Inc. – Petrochemical segment and parent of GSPL (4) GSPL – Gulf State Pipe Line Co, Inc. – Pipeline support for the petrochemical segment (5) TC – Trecora Chemical, Inc. – Specialty wax segment (6) AMAK – Al Masane Al Kobra Mining Company – Mining equity investment – 33% ownership (7) PEVM – Pioche Ely Valley Mines, Inc. – Inactive mine - 55% ownership Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") for interim financial information and in conformity with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these unaudited financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and, therefore, should be read in conjunction with the financial statements and related notes contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 . The unaudited condensed financial statements included in this document have been prepared on the same basis as the annual condensed financial statements and in management's opinion reflect all adjustments, including normal recurring adjustments, necessary to present fairly the Company's financial position, results of operations and cash flows for the interim periods presented. We have made estimates and judgments affecting the amounts reported in this document. The actual results that we experience may differ materially from our estimates. In the opinion of management, the disclosures included in these financial statements are adequate to make the information presented not misleading. Operating results for the six months ended June 30, 2018 are not necessarily indicative of results for the year ending December 31, 2018 . We currently operate in two segments, specialty petrochemical products and specialty synthetic waxes. All revenue originates from United States' sources, and all long-lived assets owned are located in the United States. In addition, we own a 33% interest in AMAK, a Saudi Arabian closed joint stock company, which owns, operates and is developing mining assets in Saudi Arabia. We account for our investment under the equity method of accounting. See Note 17. Revenue Recognition The Company adopted Financial Accounting Standards Board ("FASB") ASC Topic 606 ("ASC 606"), Revenue from Contracts with Customers and its amendments with a date of the initial application of January 1, 2018. As a result, the Company has changed its accounting policy for revenue recognition as detailed below. ASC 606 outlines a single comprehensive model for an entity to use in accounting for revenue arising from all contracts with customers except where revenues are in scope of another accounting standard. ASC 606 superseded the revenue recognition requirements in ASC Topic 605, " Revenue Recognition", and most industry specific guidance. ASC Topic 606 sets forth a five-step model for determining when and how revenue is recognized. Under the model, an entity is required to recognize revenue to depict the transfer of goods or services to a customer at an amount reflecting the consideration it expects to receive in exchange for those goods and services. ASC 606 also requires certain additional revenue-related disclosures. The Company applied the modified retrospective approach under ASC 606 which allows for the cumulative effect of adopting the new guidance on the date of initial application. Use of the modified retrospective approach means the Company's comparative periods prior to initial application are not restated. The initial application was applied to all contracts at the date of the initial application. The Company has determined that the adjustments using the modified retrospective approach did not have a material impact on the date of the initial application along with the disclosure of the effect on prior periods. Accounting Policy Beginning on January 1, 2018, 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. For the six months ended June 30, 2017 the Company recognized revenue according to FASB ASC Topic 605, " Revenue Recognition" , ("ASC 605"), when (1) the customer accepted delivery of the product and title had been transferred or when the service was performed and the Company had no significant obligations remaining to be performed; (2) a final understanding as to specific nature and terms of the agreed upon transaction had occurred; (3) price was fixed and determinable; and (4) collection was assured. Product sales generally met these criteria, and revenue was recognized, when the product was delivered or title was transferred to the customer. Sales revenue was presented net of discounts, allowances, and sales taxes. Freight costs billed to customers were recorded as a component of revenue. Revenues received in advance of future sales of products or prior to the performance of services were presented as deferred revenues. Shipping and handling costs were classified as cost of product sales and processing and were expensed as incurred. Nature of goods and services 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 14. Petrochemical segment The petrochemical 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 petrochemical 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 is typically due and collected 30 to 60 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 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 Wax segment The specialty wax 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.

RECENT ACCOUNTING PRONOUNCEMENT

RECENT ACCOUNTING PRONOUNCEMENTS	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"). ASU 2014-09 supersedes the revenue recognition requirements of FASB Accounting Standards Codification ("ASC") Topic 605, Revenue Recognition and most industry-specific guidance throughout the Accounting Standards Codification, resulting in the creation of FASB ASC Topic 606, Revenue from Contracts with Customers . ASU 2014-09 requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. This ASU provides alternative methods of retrospective adoption and is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017. The Company completed its assessment of the impact of the adoption of ASU 2014-09 across all revenue streams. This included reviewing current accounting policies and practices to identify potential differences that would result from applying the requirements under the new standard. We completed contract reviews and validated results of applying the new revenue guidance (Note 1). In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), and has subsequently issued several supplemental and/or clarifying ASUs 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, 2018, 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. The Company is currently reviewing the amendments to ensure it is fully compliant by the adoption date and does not expect to early adopt. 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 in the process of fully evaluating the amendments and will subsequently implement new processes. In addition, the Company will change its current accounting policies to comply with the amendments with such changes as mentioned above. In February 2018, the FASB issued ASU No. 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income . ASU 2018-02 was issued to address the income tax accounting treatment of the stranded tax effects within other comprehensive income due to the prohibition of backward tracing due to an income tax rate change that was initially recorded in other comprehensive income due to the enactment of the Tax Cuts and Jobs Act ("TCJA") on December 22, 2017, which changed the Company's income tax rate from 35% to 21% . The amendments to the ASU changed US GAAP whereby an entity may elect to reclassify the stranded tax effect from accumulated other comprehensive income to retained earnings. The amendments of the ASU may be adopted in total or in part using a full retrospective or modified retrospective method. The amendments of the ASU are effective for periods beginning after December 15, 2018. Early adoption is permitted. The Company believes there will be no material impact to the consolidated financial statements as a result of this update. In June 2018, the FASB issued ASU No. 2018-07, Improvements to Nonemployee Share-Based Payment Accounting. ASU 2018-07 simplifies the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments to employees, with certain exceptions. The amendments in this ASU are effective for public companies for fiscal years beginning after December 15, 2018, including interim periods within that fiscal year. The Company is assessing the effect of ASU 2018-02 on its consolidated financial statements.

TRADE RECEIVABLES

TRADE RECEIVABLES	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
TRADE RECEIVABLES	TRADE RECEIVABLES Trade receivables, net, consisted of the following: June 30, 2018 December 31, 2017 (thousands of dollars) Trade receivables $ 26,895 $ 26,079 Less allowance for doubtful accounts (428 ) (300 ) Trade receivables, net $ 26,467 $ 25,779 Trade receivables serves as collateral for our amended and restated credit agreement. See Note 10.

PREPAID EXPENSES AND OTHER ASSE

PREPAID EXPENSES AND OTHER ASSETS	6 Months Ended
	Jun. 30, 2018
Prepaid Expense and Other Assets, Current [Abstract]
PREPAID EXPENSES AND OTHER ASSETS	PREPAID EXPENSES AND OTHER ASSETS Prepaid expenses and other assets consisted of the following: June 30, 2018 December 31, 2017 (thousands of dollars) Prepaid license $ 1,919 $ 1,919 Prepaid catalyst 682 779 Prepaid insurance 115 — Spare parts 1,349 954 Other prepaid expenses and assets 1,123 772 Total $ 5,188 $ 4,424

INVENTORIES

INVENTORIES	6 Months Ended
	Jun. 30, 2018
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Inventories included the following: June 30, 2018 December 31, 2017 (thousands of dollars) Raw material $ 3,147 $ 3,703 Work in process — 27 Finished products 13,856 14,720 Total inventory $ 17,003 $ 18,450 Inventory serves as collateral for our amended and restated credit agreement. See Note 10. Inventory included petrochemical products in transit valued at approximately $3.9 million and $3.7 million at June 30, 2018 , and December 31, 2017 , respectively.

PLANT, PIPELINE AND EQUIPMENT

PLANT, PIPELINE AND EQUIPMENT	6 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
PLANT, PIPELINE AND EQUIPMENT	PLANT, PIPELINE AND EQUIPMENT Plant, pipeline and equipment consisted of the following: June 30, 2018 December 31, 2017 (thousands of dollars) Platinum catalyst metal $ 1,612 $ 1,612 Land 5,428 5,428 Plant, pipeline and equipment 189,866 186,946 Construction in progress 63,510 50,996 Total plant, pipeline and equipment 260,416 244,982 Less accumulated depreciation (68,332 ) (63,240 ) Net plant, pipeline and equipment $ 192,084 $ 181,742 Plant, pipeline, and equipment serve as collateral for our amended and restated credit agreement. See Note 10. Interest capitalized for construction was approximately $427,000 and $287,000 for the three and $731,000 and $660,000 for the six months ended June 30, 2018 and 2017 , respectively. Labor capitalized for construction was approximately $0.9 million and $0.9 million for the three and $2.1 million and $1.6 million for the six months ended June 30, 2018 , and 2017 , respectively. Construction in progress during the first six months of 2018 included equipment purchased for various equipment updates at the TC facility; new reformer unit, tankage upgrades, and an addition to the rail spur at SHR. Amortization relating to the platinum catalyst, which is included in cost of sales, was approximately $0 and $0 for the three and $0 and $25,000 for the six months ended June 30, 2018 and 2017 , respectively.

GOODWILL AND INTANGIBLE ASSETS,

GOODWILL AND INTANGIBLE ASSETS, NET	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLE ASSETS, NET	GOODWILL AND INTANGIBLE ASSETS, NET Goodwill and intangible assets were recorded in relation to the acquisition of TC on October 1, 2014. The following tables summarize the gross carrying amounts and accumulated amortization of intangible assets by major class (in thousands): June 30, 2018 Intangible assets subject to amortization (Definite-lived) Gross Accumulated Amortization Net Customer relationships $ 16,852 $ (4,213 ) $ 12,639 Non-compete agreements 94 (71 ) 23 Licenses and permits 1,471 (443 ) 1,028 Developed technology 6,131 (2,299 ) 3,832 24,548 (7,026 ) 17,522 Intangible assets not subject to amortization (Indefinite-lived) Emissions Allowance 197 — 197 Trade name 2,158 — 2,158 Total $ 26,903 $ (7,026 ) $ 19,877 December 31, 2017 Intangible assets subject to amortization (Definite-lived) Gross Accumulated Amortization Net Customer relationships $ 16,852 $ (3,651 ) $ 13,201 Non-compete agreements 94 (61 ) 33 Licenses and permits 1,471 (390 ) 1,081 Developed technology 6,131 (1,993 ) 4,138 24,548 (6,095 ) 18,453 Intangible assets not subject to amortization (Indefinite-lived) Emissions Allowance 197 — 197 Trade name 2,158 — 2,158 Total $ 26,903 $ (6,095 ) $ 20,808 Amortization expense for intangible assets included in cost of sales for the three months ended June 30, 2018 , and 2017 , was approximately $465,000 and $466,000 , and for the six months ended June 30, 2018 , and 2017 , was approximately $931,000 and $931,000 , respectively. Based on identified intangible assets that are subject to amortization as of June 30, 2018 , we expect future amortization expenses for each period to be as follows (in thousands): Total Remainder of 2018 2019 2020 2021 2022 2023 Thereafter Customer relationships $ 12,639 $ 562 $ 1,123 $ 1,123 1,123 1,123 1,123 $ 6,462 Non-compete agreements 23 9 14 — — — — — Licenses and permits 1,028 53 106 106 101 86 86 490 Developed technology 3,832 307 613 613 613 613 613 460 Total future amortization expense $ 17,522 $ 931 $ 1,856 $ 1,842 $ 1,837 $ 1,822 $ 1,822 $ 7,412

NET INCOME PER COMMON SHARE ATT

NET INCOME PER COMMON SHARE ATTRIBUTABLE TO TRECORA RESOURCES	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
NET INCOME PER COMMON SHARE ATTRIBUTABLE TO TRECORA RESOURCES	NET INCOME PER COMMON SHARE ATTRIBUTABLE TO TRECORA RESOURCES The following table (in thousands, except per share amounts) sets forth the computation of basic and diluted net income per share attributable to Trecora Resources for the three months ended June 30, 2018 and 2017 , respectively. Three Months Ended Three Months Ended Income Shares Per Share Amount Income Shares Per Share Amount Basic Net Income per Share: Net Income Attributable to Trecora Resources $ 2,215 24,370 $ 0.09 $ 832 24,256 $ 0.03 Unvested restricted stock units 349 379 Dilutive stock options outstanding 295 399 Diluted Net Income per Share: Net Income Attributable to Trecora Resources $ 2,215 25,014 $ 0.09 $ 832 25,034 $ 0.03 Six Months Ended Six Months Ended Income Shares Per Share Amount Income Shares Per Share Amount Basic Net Income per Share: Net Income Attributable to Trecora Resources $ 4,567 24,354 $ 0.19 $ 2,319 24,248 $ 0.10 Unvested restricted stock units 376 350 Dilutive stock options outstanding 389 446 Diluted Net Income per Share: Net Income Attributable to Trecora Resources $ 4,567 25,119 $ 0.18 $ 2,319 25,044 $ 0.09 At June 30, 2018 and 2017 , 924,860 and 1,334,087 shares of common stock, respectively, were issuable upon the exercise of options and warrants. In first quarter 2018, we completed an exchange of shares with certain shareholders whereby such shareholders traded 65,000 common shares of TREC in exchange for 24,489 shares of our AMAK stock. The 65,000 shares were accounted for as treasury stock.

ACCRUED LIABILITIES

ACCRUED LIABILITIES	6 Months Ended
	Jun. 30, 2018
Accrued Liabilities [Abstract]
ACCRUED LIABILITIES	ACCRUED LIABILITIES Accrued liabilities consisted of the following: June 30, 2018 December 31, 2017 (thousands of dollars) Accrued state taxes $ 295 $ 272 Accrued property taxes 900 — Accrued payroll 910 1,407 Accrued interest 31 30 Accrued officer compensation 600 500 Other 2,902 1,752 Total $ 5,638 $ 3,961

LIABILITIES AND LONG-TERM DEBT

LIABILITIES AND LONG-TERM DEBT	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
LIABILITIES AND LONG-TERM DEBT	LIABILITIES AND LONG-TERM DEBT On October 1, 2014, we entered into an Amended and Restated Credit Agreement ("ARC") with the lenders which from time to time are parties to the ARC and Bank of America, N.A., as Administrative Agent for the Lenders, and Merrill Lynch, Pierce, Fenner & Smith Incorporated as Lead Arranger. On March 28, 2017, we entered into a Second Amendment to the ARC with terms which increased the Maximum Consolidated Leverage Ratio financial covenant of 3.25 x to 4.00 x at March 31, 2017, and 4.25 x at June 30, 2017, before stepping down to 3.75 x at September 30, 2017, 3.50 x at December 31, 2017, and reverting to the original financial covenant of 3.25 x at March 31, 2018. For Fiscal Quarter Ending Maximum Consolidated Leverage Ratio March 31, 2017 4.00 to 1.00 June 30, 2017 4.25 to 1.00 September 30, 2017 3.75 to 1.00 December 31, 2017 3.50 to 1.00 March 31, 2018 and each fiscal quarter thereafter 3.25 to 1.00 The Second Amendment also reduced the Minimum Consolidated Fixed Charge Coverage Ratio of 1.25 x to 1.10 x at March 31, 2017, 1.05 x at June 30, 2017 and September 30, 2017, 1.10 x at December 31, 2017, before reverting to the original financial covenant of 1.25 x at March 31, 2018. For Fiscal Quarter Ending Minimum Consolidated Fixed Charge Coverage Ratio March 31, 2017 1.10 to 1.00 June 30, 2017 1.05 to 1.00 September 30, 2017 1.05 to 1.00 December 31, 2017 1.10 to 1.00 March 31, 2018 and each fiscal quarter thereafter 1.25 to 1.00 Also, under the terms of the Second Amendment, two additional levels of pricing were added – levels 4 and 5. Level Consolidated Leverage Ratio LIBOR Margin Base Rate Margin Commitment Fee 1 Less than 1.50 to 1.00 2.00% 1.00% 0.25% 2 Greater than or equal to 1.50 to 1.00 but less than 2.00 to 1.00 2.25% 1.25% 0.25% 3 Greater than or equal to 2.00 to 1.00 but less than 3.00 to 1.00 2.50% 1.50% 0.375% 4 Greater than or equal to 3.00 to 1.00 but less than 3.50 to 1.00 2.75% 1.75% 0.375% 5 Greater than or equal to 3.50 to 1.00 3.00% 2.00% 0.375% We were in compliance with all covenants at June 30, 2018 . On July 25, 2017, TOCCO, SHR, GSPL, and TC (SHR, GSPL and TC collectively, the "Guarantors") entered into a Third Amendment to Amended and Restated Credit Agreement ("3rd Amendment") with the lenders which from time to time are parties to the Amended and Restated Credit Agreement (collectively, the "Lenders") and Bank of America, N.A., a national banking association, as Administrative Agent for the Lenders. The 3rd Amendment increased the Revolving Facility from $40.0 million to $60.0 million . There were no other changes to the Revolving Facility. Following the effectiveness of the 3rd Amendment, we had a $60.0 million revolving line of credit with a maturity date of October 1, 2019 . As of June 30, 2018 , and December 31, 2017 , there was a long-term amount of $45.0 million and $35.0 million outstanding, respectively. The interest rate on the loan varies according to several options. Interest on the loan is paid monthly and a commitment fee of between 0.25% and 0.375% is due quarterly on the unused portion of the loan. At June 30, 2018 , approximately $14.9 million was available to be drawn; however, only $10.0 million could be drawn while maintaining compliance with our covenants. Under the ARC, we also borrowed $70.0 million in a single advance term loan (the "Acquisition Loan") to partially finance the acquisition of TC. Interest on the Acquisition Loan was payable quarterly using a ten -year commercial style amortization. Principal was also payable on the last business day of each March, June, September and December in an amount equal to $1.8 million , provided that the final installment would have occurred on the October 1, 2019 maturity date and would have been in an amount equal to the then outstanding unpaid principal balance of the Acquisition Loan. At June 30, 2018 , there was a short-term amount of $7.0 million and a long-term amount of $36.8 million outstanding. At December 31, 2017 , there was a short-term amount of $7.0 million and a long-term amount of $40.3 million outstanding. Under the ARC, we also had the right to borrow $25.0 million in a multiple advance loan ("Term Loans"). Borrowing availability under the Term Loans ended on December 31, 2015. The Term Loans converted from a multiple advance loan to a "mini-perm" loan once certain obligations were fulfilled such as certification that construction of D-Train was completed in a good and workmanlike manner, receipt of applicable permits and releases from governmental authorities, and receipt of releases of liens from the contractor and each subcontractor and supplier. Interest on the Term Loans was paid monthly. Principal was also payable on the last business day of each March, June, September and December in an amount equal to $0.3 million , provided that the final installment would have occurred on the October 1, 2019 maturity date and would have been in an amount equal to the then outstanding unpaid principal balance of the Term Loans. At June 30, 2018 , there was a short-term amount of $1.3 million and a long-term amount of $15.7 million outstanding. At December 31, 2017, there was a short-term amount of $1.3 million and a long-term amount of $16.0 million outstanding. On July 31, 2018, TOCCO and the Guarantors entered into a Fourth Amendment to Amended and Restated Credit Agreement, which, among other things, increased the commitment under the Revolving Facility to $75.0 million, increased term loan borrowings under the ARC to $87.5 million in a single term loan facility (the “Term Loan Facility”), comprising new term loan borrowings and the previously outstanding borrowings under the Acquisition Loan and Term Loans, and extended the maturity date of the ARC to July 31, 2023. See Note 20. Debt issuance costs of approximately $0.3 million and $0.5 million for the periods ended June 30, 2018 and December 31, 2017 , have been netted against outstanding loan balances. The interest rate on all of the above loans varies according to several options as defined in the ARC. At June 30, 2018 , and December 31, 2017 , the rate was 4.38% and 4.07% , respectively. The following table summarizes the carrying amounts and debt issuance costs of our long-term debt (in thousands): June 30, 2018 December 31, 2017 Acquisition loan $ 43,750 $ 47,250 Term loan 16,666 17,333 Revolving facility 45,000 35,000 Total 105,416 99,583 Debt issuance costs (340 ) (501 ) Total long-term debt $ 105,076 $ 99,082 Less current portion including loan fees 8,061 8,061 Total long-term debt, less current portion including loan fees $ 97,015 $ 91,021

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS The carrying value of cash, trade receivables, 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 reflects 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, trade receivables, accounts payable, accrued liabilities, other liabilities and variable rate long term debt. The fair value of the derivative instruments are described below. Interest Rate Swap In March 2008 we entered into an interest rate swap agreement with Bank of America related to a $10.0 million term loan secured by plant, pipeline and equipment. The interest rate swap was designed to minimize the effect of changes in the London InterBank Offered Rate ("LIBOR") rate. We had designated the interest rate swap as a cash flow hedge under ASC Topic 815, Derivatives and Hedging. However, due to the ARC, we felt that the hedge was no longer entirely effective. Due to the time required to make the determination and the immateriality of the hedge, we began treating it as ineffective as of October 1, 2014. We assessed the fair value of the interest rate swap using a present value model that includes quoted LIBOR rates and the nonperformance risk of the Company and Bank of America based on the Credit Default Swap Market (Level 2 of fair value hierarchy). We have consistently applied valuation techniques in all periods presented and believe we have obtained the most accurate information available for the types of derivative contracts we hold. The agreement terminated in December 2017; therefore, there was no outstanding liability at June 30, 2018 , and December 31, 2017 . See discussion of our derivative instruments in Note 12.

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS	DERIVATIVE INSTRUMENTS Interest Rate Swap On March 21, 2008, SHR entered into a pay-fixed, receive-variable interest rate swap agreement with Bank of America related to the $10.0 million (later increased to $14.0 million ) term loan secured by plant, pipeline and equipment. The effective date of the interest rate swap agreement was August 15, 2008, and terminated on December 15, 2017. We received credit for payments of variable rate interest made on the term loan at the loan's variable rates, which are based upon the LIBOR, and paid Bank of America an interest rate of 5.83% less the credit on the interest rate swap. We originally designated the transaction as a cash flow hedge according to ASC Topic 815, Derivatives and Hedging. Beginning on August 15, 2008, the derivative instrument was reported at fair value with any changes in fair value reported within other comprehensive income (loss) in the Company's Statement of Stockholders' Equity. We entered into the interest rate swap to minimize the effect of changes in the LIBOR rate. Due to the new debt agreements associated with the Acquisition, we believed that the hedge was no longer entirely effective. Due to the time required to make the determination and the immateriality of the hedge, we began treating the interest rate swap as ineffective as of October 1, 2014.

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION Stock-based compensation of approximately $(219,000) and $656,000 during the three months and $372,000 and $1,289,000 during the six months ended June 30, 2018 , and 2017 , respectively, was recognized. Restricted Stock Awards On January 17, 2018, we awarded 251 shares of restricted stock to an officer at a grant date price of $13.85 . The stock was immediately vested. Compensation expense recognized during the three months ended June 30, 2018 , was $0 and for the six months ended June 30, 2018 , was $5,000 . Restricted Stock Unit Awards On February 20, 2018, we awarded approximately 102,000 shares of restricted stock units to officers at a grant date price of $12.15 . One-half of the restricted stock units vest ratably over three years . The other half vests at the end of three years based upon the performance metrics of return on invested capital and earnings per share growth. The number of shares actually granted will be adjusted based upon relative performance to our peers. Compensation expense recognized during the three months ended June 30, 2018 , was approximately $108,000 and for the six months ended June 30, 2018 , was $144,000 . Officer compensation of approximately $95,000 and $40,000 during the three months and $207,000 and $40,000 during the six months ended June 30, 2018 , and 2017 , respectively, was recognized related to restricted stock unit awards granted to officers vesting through 2020. Director compensation of approximately $81,000 and $75,000 during the three months and $165,000 and $156,000 during the six months ended June 30, 2018 , and 2017 , respectively, was recognized related to restricted stock unit awards granted to directors vesting through 2020. Officer compensation of approximately $79,000 and $106,000 was recognized during the three months and $176,000 and $211,000 during the six months ended June 30, 2018 , and 2017 , respectively, related to restricted stock unit awards granted to officers. One-half of the restricted stock units vest ratably over three years . The other half vests at the end of the three years based upon the performance metrics of return on invested capital and earnings per share growth. The number of shares actually granted will be adjusted based upon relative performance to our peers. Employee compensation of approximately $98,000 and $108,000 during the three months and $202,000 and $215,000 during the six months ended June 30, 2018 , and 2017 , respectively, was recognized related to restricted stock units with a four years vesting period which was awarded to officers. This restricted stock vests through 2019. Restricted stock units activity in the first half of 2018 was as follows: Shares of Restricted Stock Units Weighted Average Grant Date Price per Share Outstanding at January 1, 2018 387,702 $ 11.39 Granted 102,317 $ 12.15 Forfeited (48,631 ) $ 10.88 Vested (92,513 ) $ 11.79 Outstanding at June 30, 2018 348,875 $ 11.53 Stock Option and Warrant Awards A summary of the status of our stock option awards and warrants is presented below: Number of Stock Options & Warrants Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Life Outstanding at January 1, 2018 1,323,587 $ 7.82 Granted — — Exercised (198,727 ) 5.43 Cancelled (200,000 ) 3.40 Forfeited — — Outstanding at June 30, 2018 924,860 $ 9.29 4.7 Exercisable at June 30, 2018 924,860 $ 9.29 4.7 The fair value of the options granted were calculated using the Black Scholes option valuation model with the assumptions as disclosed in prior quarterly and annual filings. Directors' compensation of approximately $0 and $30,000 during the three months and $0 and $60,000 during the six months ended June 30, 2018 , and 2017 , respectively, was recognized related to options to purchase shares vesting through 2017. Employee compensation of approximately $0 and $298,000 during the three months and $154,000 and $607,000 during the six months ended June 30, 2018 , and 2017 , respectively, was recognized related to options with a 4 - year vesting period which were awarded to officers and key employees. These options vest through 2018. Post-retirement compensation of approximately $679,000 and $0 during the three months and $679,000 and $0 during the six months ended June 30, 2018 , and 2017 , was reversed related to options awarded to Mr. Hatem El Khalidi in July 2009. On May 9, 2010, the Board of Directors determined that Mr. El Khalidi 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. See further discussion in Note 19. See the Company's Annual Report on Form 10-K for the year ended December 31, 2017 for additional information.

SEGMENT INFORMATION

SEGMENT INFORMATION	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION 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. Segment data may include rounding differences. Our specialty petrochemical segment includes SHR and GSPL. Our specialty synthetic wax segment is 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. Three Months Ended June 30, 2018 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Product sales $ 56,135 $ 7,434 $ — $ — $ 63,569 Processing fees 1,685 2,852 — — 4,537 Total revenues 57,820 10,286 — — 68,106 Operating profit (loss) before depreciation and amortization 6,095 1,164 (834 ) — 6,425 Operating profit (loss) 4,440 (201 ) (842 ) — 3,397 Profit (loss) before taxes 3,859 (506 ) (542 ) — 2,811 Depreciation and amortization 1,655 1,365 8 — 3,028 Capital expenditures 3,529 877 — — 4,406 Three Months Ended June 30, 2017 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Product sales $ 50,508 $ 6,508 $ — — $ 57,016 Processing fees 2,071 3,028 — — 5,099 Total revenues 52,579 9,536 — — 62,115 Operating profit (loss) before depreciation and amortization 8,761 810 (1,841 ) — 7,730 Operating profit (loss) 7,217 (198 ) (1,857 ) — 5,162 Profit (loss) before taxes 6,598 (269 ) (5,165 ) — 1,164 Depreciation and amortization 1,544 1,008 16 — 2,568 Capital expenditures 9,021 4,931 — — 13,952 Six Months Ended June 30, 2018 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Product sales $ 116,420 $ 13,817 $ — $ 31 $ 130,268 Processing fees 3,713 6,064 — (198 ) 9,579 Total revenues 120,133 19,881 — (167 ) 139,847 Operating profit (loss) before depreciation and amortization 14,488 1,554 (2,982 ) — 13,060 Operating profit (loss) 11,119 (1,115 ) (2,998 ) — 7,006 Profit (loss) before taxes 9,913 (1,687 ) (2,473 ) — 5,753 Depreciation and amortization 3,369 2,669 16 — 6,054 Capital expenditures 13,812 1,622 — — 15,434 Six Months Ended June 30, 2017 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Product sales $ 94,899 $ 13,016 $ — — $ 107,915 Processing fees 3,559 6,183 — — 9,742 Total revenues 98,458 19,199 — — 117,657 Operating profit (loss) before depreciation and amortization 16,975 1,555 (4,020 ) — 14,510 Operating profit (loss) 13,875 (469 ) (4,052 ) — 9,354 Profit (loss) before taxes 12,601 (559 ) (8,330 ) — 3,712 Depreciation and amortization 3,100 2,024 32 — 5,156 Capital expenditures 17,777 10,056 — — 27,833 June 30, 2018 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Trade receivables, product sales $ 20,377 $ 3,639 $ — $ — $ 24,016 Trade receivables, processing fees 671 1,780 — — 2,451 Goodwill and intangible assets, net — 41,675 — — 41,675 Total assets 279,161 115,696 92,857 (154,086 ) 333,628 December 31, 2017 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Trade receivables, product sales $ 20,211 $ 2,671 $ — $ — $ 22.882 Trade receivables, processing fees 983 1,914 — — 2,897 Goodwill and intangible assets, net — 42,606 — — 42,606 Total assets 265,213 117,579 97,880 (153,346 ) 327,326

INCOME TAXES

INCOME TAXES	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES 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 November 2016 that the December 31, 2014, tax return was selected for audit. In April 2017 the audit was expanded to include the year ended December 31, 2015, to review the refund claim related to research and development activities. We received notification from the IRS in March 2018 that audit was complete and acceptance of the refund claims resulting from the R&D credit for approximately $350,000 , which has now been received. We also received notification that Texas will audit our R&D credit calculations for 2014 and 2015. We are in the process of submitting additional documentation to Texas. We do not expect any changes related to the Texas audit. Tax returns for various jurisdictions remain open for examination for the years 2014 through 2017. As of June 30, 2018 and December 31, 2017 , respectively, we recognized no adjustment for uncertain tax positions or related interest and penalties. The effective tax rate varies from the federal statutory rate of 21% primarily as a result of state tax expense and stock based compensation for the three and six months ended June 30, 2018 . The effective tax rate varies from the federal statutory rate of 35% primarily as a result of state tax expense and stock option based compensation offset by the manufacturing deduction for the three and six months ended June 30, 2017 . We continue to maintain a valuation allowance against certain deferred tax assets where realization is not certain. On December 22, 2017, Public Law No. 115-97 known as the TCJA was enacted. The TCJA includes a number of changes to existing U.S. tax laws that impact the Company, most notably a reduction of the U.S. federal corporate income tax rate from a maximum of 35% to a flat 21% for tax years effective January 1, 2018. The TCJA also implements a territorial tax system, provides for a one-time deemed repatriation tax on unrepatriated foreign earnings, eliminates the alternative minimum tax (AMT), makes AMT credit carryforwards refundable, and permits the acceleration of depreciation for certain assets placed into service after September 27, 2017. In addition, the TJCA creates prospective changes beginning in 2018, including repeal of the domestic manufacturing deduction, acceleration of tax revenue recognition, capitalization of research and development expenditures, additional limitations on executive compensation and limitations on the deductibility of interest. We have elected to recognize the income tax effects of the TCJA in our financial statements in accordance with Staff Accounting Bulletin 118 (SAB 118), which provides guidance for the application of ASC Topic 740 Income Taxes , in the reporting period in which the TCJA was signed into law. Under SAB 118 when a Company does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the TCJA, it will recognize provisional amounts if a reasonable estimate can be made. If a reasonable estimate cannot be made, then no impact is recognized for the effect of the TCJA. SAB 118 permits an up to one year measurement period to finalize the measurement of the impact of the TCJA. We have recognized the provisional tax impacts related to the acceleration of depreciation and included these amounts in our consolidated financial statements for the three and six months ended June 30, 2018 . The ultimate impact may differ from these provisional amounts, possibly materially, due to, among other things, additional analysis, changes in interpretations and assumptions the we have made, additional regulatory guidance that may be issued, and actions we may take as a result of the TCJA . We did not identify items for which the income tax effects of the TCJA have not been completed, and a reasonable estimate could not be determined as of June 30, 2018 , and December 31, 2017 , except for changes in estimates that can result from finalizing the filing of the 2017 U.S. income tax return, which are not anticipated to be material.

POST-RETIREMENT OBLIGATIONS

POST-RETIREMENT OBLIGATIONS	6 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
POST-RETIREMENT OBLIGATIONS	POST-RETIREMENT OBLIGATIONS In January 2008 an amended retirement agreement was entered into with Mr. Hatem El Khalidi; however, on May 9, 2010, the Board of Directors terminated the agreement due to actions of Mr. El Khalidi. See Notes 13 and 19. All amounts which had not met termination dates remained recorded until a resolution was achieved. The matter was resolved on May 25, 2018 and as of June 30, 2018, post-retirement obligations of approximately $1.0 million for Mr. El Khalidi have been reversed. As of December 31, 2017 , approximately 1.0 million remained outstanding and was included in post-retirement benefits. In July 2015 we entered into a retirement agreement with former CEO, Nicholas Carter. As of June 30, 2018 and December 31, 2017 , approximately $0.2 million and $0.3 million , respectively, remained outstanding and was included in post-retirement obligations. In June 2018 we entered into a retirement agreement with former VP, Accounting & Compliance, Connie Cook. As of June 30, 2018 , approximately $0.2 million remained outstanding and was included in post-retirement obligations. See the Company's Annual Report on Form 10-K for the year ended December 31, 2017 for additional information.

INVESTMENT IN AMAK

INVESTMENT IN AMAK	6 Months Ended
	Jun. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
INVESTMENT IN AMAK	INVESTMENT IN AMAK In first quarter 2018, we completed an exchange of shares with certain shareholders whereby such shareholders traded 65,000 common shares of TREC in exchange for 24,489 shares of our AMAK stock. The 65,000 shares were accounted for as treasury stock. This transaction reduced our ownership percentage from 33.44% to 33.41% . As of June 30, 2018 , and December 31, 2017 , the Company had a non-controlling equity interest of 33.4% in AMAK of approximately $45.5 million and $45.1 million , respectively. This investment is accounted for under the equity method. There were no events or changes in circumstances that may have an adverse effect on the fair value of our investment in AMAK at June 30, 2018 . AMAK's financial statements were prepared in the functional currency of AMAK which is the Saudi Riyal ("SR"). In June 1986 the SR was officially pegged to the U. S. Dollar ("USD") at a fixed exchange rate of 1 USD to 3.75 SR. The summarized results of operation and financial position for AMAK are as follows: Results of Operations Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 (thousands of dollars) (thousands of dollars) Sales $ 19,494 $ — $ 33,581 $ 2,256 Cost of sales 16,555 8,901 29,061 12,463 Gross profit (loss) $ 2,939 $ (8,901 ) $ 4,520 $ (10,207 ) General, administrative and other expenses 3,265 1,971 5,166 4,559 Net Loss $ (326 ) $ (10,872 ) $ (646 ) $ (14,766 ) Depreciation and amortization 8,281 7,609 15,982 10,664 Net income (loss) before depreciation and amortization $ 7,955 $ (3,263 ) $ 15,336 $ (4,102 ) Financial Position June 30, December 31, 2018 2017 (thousands of dollars) Current assets $ 33,273 $ 23,333 Noncurrent assets 228,733 237,875 Total assets $ 262,006 $ 261,208 Current liabilities $ 22,873 $ 24,439 Long term liabilities 71,520 68,837 Shareholders' equity 167,613 167,932 $ 262,006 $ 261,208 The equity in the income or loss of AMAK reflected on the consolidated statements of income for the three months and six months ended June 30, 2018 , and 2017 , is comprised of the following: Three Months Ended Six Months Ended 2018 2017 2018 2017 (thousands of dollars) (thousands of dollars) AMAK Net Loss $ (326 ) $ (10,872 ) $ (646 ) $ (14,766 ) Company's share of loss reported by AMAK $ (109 ) $ (3,635 ) $ (216 ) $ (4,938 ) Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK 337 337 674 674 Equity in earnings (loss) of AMAK $ 228 $ (3,298 ) $ 458 $ (4,264 ) See our Annual Report on Form 10-K for the year ended December 31, 2017 for additional information. At June 30, 2018 , and December 31, 2017 , we had a receivable from AMAK of approximately $204,000 and $121,000 , respectively, relating to unreimbursed travel and Board expenses which are included in prepaid and other assets. We did not advance any cash to AMAK during 2018 .

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	6 Months Ended
	Jun. 30, 2018
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS Consulting fees of approximately $0 were incurred during the three months and $27,000 during the six months ended June 30, 2017 , from IHS Global FZ LLC of which Company director Gary K Adams held the position of Chief Advisor – Chemicals until April 1, 2017. Consulting fees of approximately $19,000 and $18,000 were incurred during the three months and $50,000 and $37,000 during the six months ended June 30, 2018 , and 2017 , respectively, from our Executive Chairman, Nicholas Carter. Due to his history and experience with the Company and to provide continuity after his retirement, a three year consulting agreement was entered into with Mr. Carter in July 2015. In March 2018, a new consulting agreement was entered into with Mr. Carter effective through December 31, 2018, unless otherwise agreed by the Company and Mr. Carter.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Guarantees On October 24, 2010, we executed a limited Guarantee in favor of the Saudi Industrial Development Fund ("SIDF") whereby we agreed to guaranty up to 41% of the SIDF loan to AMAK in the principal amount of 330.0 million Saudi Riyals (US $88.0 million ) (the "Loan"). The term of the loan was originally through June 2019. As a condition of the Loan, SIDF required all shareholders of AMAK to execute personal or corporate Guarantees; as a result, our guarantee is for approximately 135.3 million Saudi Riyals (US $36.1 million ). The loan was necessary to continue construction of the AMAK facilities and provide working capital needs. We received no consideration in connection with extending the guarantee and did so to maintain and enhance the value of its investment. On July 8, 2018, the SIDF loan was amended to adjust the repayment schedule and extend the repayment terms through April 2024. Under the new payment terms the current amount due to SIDF in 2019 is $8,000,000 . The total amount outstanding to the SIDF at June 30, 2018 , was 305.0 million Saudi Riyals (US $81.3 million ). Operating Lease Commitments We have operating leases for the rental of railcars, office space, and equipment with expiration dates through 2026. Rental expense for these operating leases for the three months ended June 30, 2018 , and 2017 , was $1.0 million and $0.8 million , respectively, and for the six months ended June 30, 2018 , and 2017 , was $2.1 million and $1.6 million , respectively. Litigation On March 21, 2011, Mr. El Khalidi filed suit against the Company in Texas alleging breach of contract and other claims. The 88th Judicial District Court of Hardin County, Texas dismissed all claims and counterclaims for want of prosecution in this matter on July 24, 2013. The Ninth Court of Appeals subsequently affirmed the dismissal for want of prosecution and the Supreme Court of Texas denied Mr. El Khalidi's petition for review. On May 1, 2014, Mr. El Khalidi refiled his lawsuit against the Company for breach of contract and defamation in the 356th Judicial District Court of Hardin County, Texas. The case was transferred to the 88th Judicial District Court of Hardin County, Texas. The Trial Court dismissed all of Mr. El Khalidi's claims and causes of action with prejudice and the Ninth Court of Appeals affirmed. Mr. El Khalidi filed a petition for review with the Supreme Court of Texas, which was denied April 6, 2018. Mr. El Khalidi filed a motion for rehearing of his petition for review with the Supreme Court of Texas on April 23, 2018. On May 25, 2018, the Supreme Court of Texas denied the motion for rehearing and the matter is considered closed. 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 From time to time, we may incur shortfall fees due to feedstock purchases being below the minimum amounts prescribed by our agreements with our suppliers. Shortfall fee expenses for the three months ended June 30, 2018 , and 2017 , were $0.4 million and $0.9 million , respectively, and for the six months ended June 30, 2018 , and 2017 , were $0.5 million and $1.8 million , respectively. Environmental Remediation Amounts charged to expense for various activities related to environmental monitoring, compliance, and improvements were approximately $154,000 and $160,000 for the three months ended and $303,000 and $325,000 for the six months ended June 30, 2018 , and 2017 , respectively.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On July 31, 2018, TOCCO and the Guarantors entered into a Fourth Amendment to Amended and Restated Credit Agreement (“4th Amendment”) with the lenders party thereto, Bank of America, N.A., as Administrative Agent, Swingline Lender and L/C Issuer, and Citibank, N.A., as an L/C Issuer. Pursuant to 4th Amendment, the commitment under the Revolving Facility of the ARC was increased from $60.0 million to $75.0 million . TOCCO also increased total term loan borrowings under the ARC to $87.5 million in the Term Loan Facility, comprising new term loan borrowings and the previously outstanding borrowings under the Acquisition Loan and Term Loans. Proceeds of the new borrowings under the Term Loan Facility were used to repay a portion of the outstanding borrowings under the Revolving Facility and pay fees and expenses of the transaction. The 4th Amendment also increased the size of the accordion feature allowing TOCCO to request an increase in 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, subject to the lenders acceptance of any increased commitment and certain other conditions. As of the date of this Quarterly Report on Form 10-Q, there was approximately $19.0 million in borrowings outstanding under the Revolving Facility and $87.5 million in borrowings under the Term Loan Facility. The Fourth Amendment to the Amended and Restated Credit Agreement increased our available revolving borrowing capacity to approximately $55.9 million . Pursuant to the 4th Amendment, the maturity date for borrowings under the ARC was extended from October 1, 2019 to July 31, 2023. The interest rates margins applicable to borrowings under the ARC were also reduced to LIBOR plus an applicable margin ranging from 1.25% to 2.25% or, at the option of TOCCO, the base rate plus an applicable margin ranging from 0.25% to 1.25% , in each case, with the applicable margin being determined based on the Consolidated Leverage Ratio (as defined in the ARC) of TOCCO. A commitment fee between 0.20% and 0.30% is also payable quarterly on the unused portion of the Revolving Facility. Borrowings under the Term Loan Facility continue to be 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. The Fourth Amendment also modified certain covenants and other provisions of the ARC to provide us with additional flexibility, including (i) increasing the maximum Consolidated Leverage Ratio that must be maintained by TOCCO to 3.50 to 1.00 (subject to temporary increase following certain acquisitions), with compliance to begin with the quarter ended December 31, 2018, (ii) decreasing the minimum Consolidated Fixed Charge Coverage Ratio (as defined in the ARC) that must be maintained by TOCCO to 1.15 to 1.00 and (iii) eliminating the requirement that TOCCO maintain a minimum asset coverage ratio.

RECENT ACCOUNTING PRONOUNCEME28

RECENT ACCOUNTING PRONOUNCEMENTS (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") for interim financial information and in conformity with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these unaudited financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and, therefore, should be read in conjunction with the financial statements and related notes contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 .
Use of Estimates	The unaudited condensed financial statements included in this document have been prepared on the same basis as the annual condensed financial statements and in management's opinion reflect all adjustments, including normal recurring adjustments, necessary to present fairly the Company's financial position, results of operations and cash flows for the interim periods presented. We have made estimates and judgments affecting the amounts reported in this document. The actual results that we experience may differ materially from our estimates. In the opinion of management, the disclosures included in these financial statements are adequate to make the information presented not misleading.
Revenue Recognition	Revenue Recognition The Company adopted Financial Accounting Standards Board ("FASB") ASC Topic 606 ("ASC 606"), Revenue from Contracts with Customers and its amendments with a date of the initial application of January 1, 2018. As a result, the Company has changed its accounting policy for revenue recognition as detailed below. ASC 606 outlines a single comprehensive model for an entity to use in accounting for revenue arising from all contracts with customers except where revenues are in scope of another accounting standard. ASC 606 superseded the revenue recognition requirements in ASC Topic 605, " Revenue Recognition", and most industry specific guidance. ASC Topic 606 sets forth a five-step model for determining when and how revenue is recognized. Under the model, an entity is required to recognize revenue to depict the transfer of goods or services to a customer at an amount reflecting the consideration it expects to receive in exchange for those goods and services. ASC 606 also requires certain additional revenue-related disclosures. The Company applied the modified retrospective approach under ASC 606 which allows for the cumulative effect of adopting the new guidance on the date of initial application. Use of the modified retrospective approach means the Company's comparative periods prior to initial application are not restated. The initial application was applied to all contracts at the date of the initial application. The Company has determined that the adjustments using the modified retrospective approach did not have a material impact on the date of the initial application along with the disclosure of the effect on prior periods. Accounting Policy Beginning on January 1, 2018, 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. For the six months ended June 30, 2017 the Company recognized revenue according to FASB ASC Topic 605, " Revenue Recognition" , ("ASC 605"), when (1) the customer accepted delivery of the product and title had been transferred or when the service was performed and the Company had no significant obligations remaining to be performed; (2) a final understanding as to specific nature and terms of the agreed upon transaction had occurred; (3) price was fixed and determinable; and (4) collection was assured. Product sales generally met these criteria, and revenue was recognized, when the product was delivered or title was transferred to the customer. Sales revenue was presented net of discounts, allowances, and sales taxes. Freight costs billed to customers were recorded as a component of revenue. Revenues received in advance of future sales of products or prior to the performance of services were presented as deferred revenues. Shipping and handling costs were classified as cost of product sales and processing and were expensed as incurred. Nature of goods and services 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 14.
Revenue from Contracts with Customers	Petrochemical segment The petrochemical 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 petrochemical 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 is typically due and collected 30 to 60 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 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 Wax segment The specialty wax 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.
Recent Accounting Pronouncements	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"). ASU 2014-09 supersedes the revenue recognition requirements of FASB Accounting Standards Codification ("ASC") Topic 605, Revenue Recognition and most industry-specific guidance throughout the Accounting Standards Codification, resulting in the creation of FASB ASC Topic 606, Revenue from Contracts with Customers . ASU 2014-09 requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. This ASU provides alternative methods of retrospective adoption and is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017. The Company completed its assessment of the impact of the adoption of ASU 2014-09 across all revenue streams. This included reviewing current accounting policies and practices to identify potential differences that would result from applying the requirements under the new standard. We completed contract reviews and validated results of applying the new revenue guidance (Note 1). In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), and has subsequently issued several supplemental and/or clarifying ASUs 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, 2018, 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. The Company is currently reviewing the amendments to ensure it is fully compliant by the adoption date and does not expect to early adopt. 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 in the process of fully evaluating the amendments and will subsequently implement new processes. In addition, the Company will change its current accounting policies to comply with the amendments with such changes as mentioned above. In February 2018, the FASB issued ASU No. 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income . ASU 2018-02 was issued to address the income tax accounting treatment of the stranded tax effects within other comprehensive income due to the prohibition of backward tracing due to an income tax rate change that was initially recorded in other comprehensive income due to the enactment of the Tax Cuts and Jobs Act ("TCJA") on December 22, 2017, which changed the Company's income tax rate from 35% to 21% . The amendments to the ASU changed US GAAP whereby an entity may elect to reclassify the stranded tax effect from accumulated other comprehensive income to retained earnings. The amendments of the ASU may be adopted in total or in part using a full retrospective or modified retrospective method. The amendments of the ASU are effective for periods beginning after December 15, 2018. Early adoption is permitted. The Company believes there will be no material impact to the consolidated financial statements as a result of this update. In June 2018, the FASB issued ASU No. 2018-07, Improvements to Nonemployee Share-Based Payment Accounting. ASU 2018-07 simplifies the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments to employees, with certain exceptions. The amendments in this ASU are effective for public companies for fiscal years beginning after December 15, 2018, including interim periods within that fiscal year. The Company is assessing the effect of ASU 2018-02 on its consolidated financial statements.

TRADE RECEIVABLES (Tables)

TRADE RECEIVABLES (Tables)	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Trade Receivables	Trade receivables, net, consisted of the following: June 30, 2018 December 31, 2017 (thousands of dollars) Trade receivables $ 26,895 $ 26,079 Less allowance for doubtful accounts (428 ) (300 ) Trade receivables, net $ 26,467 $ 25,779

PREPAID EXPENSES AND OTHER AS30

PREPAID EXPENSES AND OTHER ASSETS (Tables)	6 Months Ended
	Jun. 30, 2018
Prepaid Expense and Other Assets, Current [Abstract]
Schedule of Prepaid Expenses and Other Assets	Prepaid expenses and other assets consisted of the following: June 30, 2018 December 31, 2017 (thousands of dollars) Prepaid license $ 1,919 $ 1,919 Prepaid catalyst 682 779 Prepaid insurance 115 — Spare parts 1,349 954 Other prepaid expenses and assets 1,123 772 Total $ 5,188 $ 4,424

INVENTORIES (Tables)

INVENTORIES (Tables)	6 Months Ended
	Jun. 30, 2018
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories included the following: June 30, 2018 December 31, 2017 (thousands of dollars) Raw material $ 3,147 $ 3,703 Work in process — 27 Finished products 13,856 14,720 Total inventory $ 17,003 $ 18,450

PLANT, PIPELINE AND EQUIPMENT (

PLANT, PIPELINE AND EQUIPMENT (Tables)	6 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Schedule of Plant, Pipeline and Equipment	Plant, pipeline and equipment consisted of the following: June 30, 2018 December 31, 2017 (thousands of dollars) Platinum catalyst metal $ 1,612 $ 1,612 Land 5,428 5,428 Plant, pipeline and equipment 189,866 186,946 Construction in progress 63,510 50,996 Total plant, pipeline and equipment 260,416 244,982 Less accumulated depreciation (68,332 ) (63,240 ) Net plant, pipeline and equipment $ 192,084 $ 181,742

GOODWILL AND INTANGIBLE ASSET33

GOODWILL AND INTANGIBLE ASSETS, NET (Tables)	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Finite-Lived Intangible Assets by Major Class	The following tables summarize the gross carrying amounts and accumulated amortization of intangible assets by major class (in thousands): June 30, 2018 Intangible assets subject to amortization (Definite-lived) Gross Accumulated Amortization Net Customer relationships $ 16,852 $ (4,213 ) $ 12,639 Non-compete agreements 94 (71 ) 23 Licenses and permits 1,471 (443 ) 1,028 Developed technology 6,131 (2,299 ) 3,832 24,548 (7,026 ) 17,522 Intangible assets not subject to amortization (Indefinite-lived) Emissions Allowance 197 — 197 Trade name 2,158 — 2,158 Total $ 26,903 $ (7,026 ) $ 19,877 December 31, 2017 Intangible assets subject to amortization (Definite-lived) Gross Accumulated Amortization Net Customer relationships $ 16,852 $ (3,651 ) $ 13,201 Non-compete agreements 94 (61 ) 33 Licenses and permits 1,471 (390 ) 1,081 Developed technology 6,131 (1,993 ) 4,138 24,548 (6,095 ) 18,453 Intangible assets not subject to amortization (Indefinite-lived) Emissions Allowance 197 — 197 Trade name 2,158 — 2,158 Total $ 26,903 $ (6,095 ) $ 20,808
Summary of Indefinite-Lived Intangible Assets by Major Class	The following tables summarize the gross carrying amounts and accumulated amortization of intangible assets by major class (in thousands): June 30, 2018 Intangible assets subject to amortization (Definite-lived) Gross Accumulated Amortization Net Customer relationships $ 16,852 $ (4,213 ) $ 12,639 Non-compete agreements 94 (71 ) 23 Licenses and permits 1,471 (443 ) 1,028 Developed technology 6,131 (2,299 ) 3,832 24,548 (7,026 ) 17,522 Intangible assets not subject to amortization (Indefinite-lived) Emissions Allowance 197 — 197 Trade name 2,158 — 2,158 Total $ 26,903 $ (7,026 ) $ 19,877 December 31, 2017 Intangible assets subject to amortization (Definite-lived) Gross Accumulated Amortization Net Customer relationships $ 16,852 $ (3,651 ) $ 13,201 Non-compete agreements 94 (61 ) 33 Licenses and permits 1,471 (390 ) 1,081 Developed technology 6,131 (1,993 ) 4,138 24,548 (6,095 ) 18,453 Intangible assets not subject to amortization (Indefinite-lived) Emissions Allowance 197 — 197 Trade name 2,158 — 2,158 Total $ 26,903 $ (6,095 ) $ 20,808
Estimated Amortization Expenses for Succeeding Five Fiscal Years	Based on identified intangible assets that are subject to amortization as of June 30, 2018 , we expect future amortization expenses for each period to be as follows (in thousands): Total Remainder of 2018 2019 2020 2021 2022 2023 Thereafter Customer relationships $ 12,639 $ 562 $ 1,123 $ 1,123 1,123 1,123 1,123 $ 6,462 Non-compete agreements 23 9 14 — — — — — Licenses and permits 1,028 53 106 106 101 86 86 490 Developed technology 3,832 307 613 613 613 613 613 460 Total future amortization expense $ 17,522 $ 931 $ 1,856 $ 1,842 $ 1,837 $ 1,822 $ 1,822 $ 7,412

NET INCOME PER COMMON SHARE A34

NET INCOME PER COMMON SHARE ATTRIBUTABLE TO TRECORA RESOURCES (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Schedule of Income Per Share Computation	The following table (in thousands, except per share amounts) sets forth the computation of basic and diluted net income per share attributable to Trecora Resources for the three months ended June 30, 2018 and 2017 , respectively. Three Months Ended Three Months Ended Income Shares Per Share Amount Income Shares Per Share Amount Basic Net Income per Share: Net Income Attributable to Trecora Resources $ 2,215 24,370 $ 0.09 $ 832 24,256 $ 0.03 Unvested restricted stock units 349 379 Dilutive stock options outstanding 295 399 Diluted Net Income per Share: Net Income Attributable to Trecora Resources $ 2,215 25,014 $ 0.09 $ 832 25,034 $ 0.03 Six Months Ended Six Months Ended Income Shares Per Share Amount Income Shares Per Share Amount Basic Net Income per Share: Net Income Attributable to Trecora Resources $ 4,567 24,354 $ 0.19 $ 2,319 24,248 $ 0.10 Unvested restricted stock units 376 350 Dilutive stock options outstanding 389 446 Diluted Net Income per Share: Net Income Attributable to Trecora Resources $ 4,567 25,119 $ 0.18 $ 2,319 25,044 $ 0.09

ACCRUED LIABILITIES (Tables)

ACCRUED LIABILITIES (Tables)	6 Months Ended
	Jun. 30, 2018
Accrued Liabilities [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities consisted of the following: June 30, 2018 December 31, 2017 (thousands of dollars) Accrued state taxes $ 295 $ 272 Accrued property taxes 900 — Accrued payroll 910 1,407 Accrued interest 31 30 Accrued officer compensation 600 500 Other 2,902 1,752 Total $ 5,638 $ 3,961

LIABILITIES AND LONG-TERM DEBT

LIABILITIES AND LONG-TERM DEBT (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Schedule of Maximum Leverage Ratio	For Fiscal Quarter Ending Maximum Consolidated Leverage Ratio March 31, 2017 4.00 to 1.00 June 30, 2017 4.25 to 1.00 September 30, 2017 3.75 to 1.00 December 31, 2017 3.50 to 1.00 March 31, 2018 and each fiscal quarter thereafter 3.25 to 1.00
Schedule of Minimum Fixed Charge Coverage Ratio	For Fiscal Quarter Ending Minimum Consolidated Fixed Charge Coverage Ratio March 31, 2017 1.10 to 1.00 June 30, 2017 1.05 to 1.00 September 30, 2017 1.05 to 1.00 December 31, 2017 1.10 to 1.00 March 31, 2018 and each fiscal quarter thereafter 1.25 to 1.00
Schedule of Pricing Levels for Leverage Ratios	Level Consolidated Leverage Ratio LIBOR Margin Base Rate Margin Commitment Fee 1 Less than 1.50 to 1.00 2.00% 1.00% 0.25% 2 Greater than or equal to 1.50 to 1.00 but less than 2.00 to 1.00 2.25% 1.25% 0.25% 3 Greater than or equal to 2.00 to 1.00 but less than 3.00 to 1.00 2.50% 1.50% 0.375% 4 Greater than or equal to 3.00 to 1.00 but less than 3.50 to 1.00 2.75% 1.75% 0.375% 5 Greater than or equal to 3.50 to 1.00 3.00% 2.00% 0.375%
Schedule of Long-Term Debt	The following table summarizes the carrying amounts and debt issuance costs of our long-term debt (in thousands): June 30, 2018 December 31, 2017 Acquisition loan $ 43,750 $ 47,250 Term loan 16,666 17,333 Revolving facility 45,000 35,000 Total 105,416 99,583 Debt issuance costs (340 ) (501 ) Total long-term debt $ 105,076 $ 99,082 Less current portion including loan fees 8,061 8,061 Total long-term debt, less current portion including loan fees $ 97,015 $ 91,021

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Restricted Stock Units Activity	Restricted stock units activity in the first half of 2018 was as follows: Shares of Restricted Stock Units Weighted Average Grant Date Price per Share Outstanding at January 1, 2018 387,702 $ 11.39 Granted 102,317 $ 12.15 Forfeited (48,631 ) $ 10.88 Vested (92,513 ) $ 11.79 Outstanding at June 30, 2018 348,875 $ 11.53
Summary of Status of Stock Option Awards and Warrants	A summary of the status of our stock option awards and warrants is presented below: Number of Stock Options & Warrants Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Life Outstanding at January 1, 2018 1,323,587 $ 7.82 Granted — — Exercised (198,727 ) 5.43 Cancelled (200,000 ) 3.40 Forfeited — — Outstanding at June 30, 2018 924,860 $ 9.29 4.7 Exercisable at June 30, 2018 924,860 $ 9.29 4.7

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Summary of Segment Information	Three Months Ended June 30, 2018 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Product sales $ 56,135 $ 7,434 $ — $ — $ 63,569 Processing fees 1,685 2,852 — — 4,537 Total revenues 57,820 10,286 — — 68,106 Operating profit (loss) before depreciation and amortization 6,095 1,164 (834 ) — 6,425 Operating profit (loss) 4,440 (201 ) (842 ) — 3,397 Profit (loss) before taxes 3,859 (506 ) (542 ) — 2,811 Depreciation and amortization 1,655 1,365 8 — 3,028 Capital expenditures 3,529 877 — — 4,406 Three Months Ended June 30, 2017 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Product sales $ 50,508 $ 6,508 $ — — $ 57,016 Processing fees 2,071 3,028 — — 5,099 Total revenues 52,579 9,536 — — 62,115 Operating profit (loss) before depreciation and amortization 8,761 810 (1,841 ) — 7,730 Operating profit (loss) 7,217 (198 ) (1,857 ) — 5,162 Profit (loss) before taxes 6,598 (269 ) (5,165 ) — 1,164 Depreciation and amortization 1,544 1,008 16 — 2,568 Capital expenditures 9,021 4,931 — — 13,952 Six Months Ended June 30, 2018 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Product sales $ 116,420 $ 13,817 $ — $ 31 $ 130,268 Processing fees 3,713 6,064 — (198 ) 9,579 Total revenues 120,133 19,881 — (167 ) 139,847 Operating profit (loss) before depreciation and amortization 14,488 1,554 (2,982 ) — 13,060 Operating profit (loss) 11,119 (1,115 ) (2,998 ) — 7,006 Profit (loss) before taxes 9,913 (1,687 ) (2,473 ) — 5,753 Depreciation and amortization 3,369 2,669 16 — 6,054 Capital expenditures 13,812 1,622 — — 15,434 Six Months Ended June 30, 2017 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Product sales $ 94,899 $ 13,016 $ — — $ 107,915 Processing fees 3,559 6,183 — — 9,742 Total revenues 98,458 19,199 — — 117,657 Operating profit (loss) before depreciation and amortization 16,975 1,555 (4,020 ) — 14,510 Operating profit (loss) 13,875 (469 ) (4,052 ) — 9,354 Profit (loss) before taxes 12,601 (559 ) (8,330 ) — 3,712 Depreciation and amortization 3,100 2,024 32 — 5,156 Capital expenditures 17,777 10,056 — — 27,833 June 30, 2018 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Trade receivables, product sales $ 20,377 $ 3,639 $ — $ — $ 24,016 Trade receivables, processing fees 671 1,780 — — 2,451 Goodwill and intangible assets, net — 41,675 — — 41,675 Total assets 279,161 115,696 92,857 (154,086 ) 333,628 December 31, 2017 Petrochemical Specialty Wax Corporate Eliminations Consolidated (in thousands) Trade receivables, product sales $ 20,211 $ 2,671 $ — $ — $ 22.882 Trade receivables, processing fees 983 1,914 — — 2,897 Goodwill and intangible assets, net — 42,606 — — 42,606 Total assets 265,213 117,579 97,880 (153,346 ) 327,326

INVESTMENT IN AMAK (Tables)

INVESTMENT IN AMAK (Tables)	6 Months Ended
	Jun. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Summary of Operating Results and Financial Position for Equity Method Investments	The summarized results of operation and financial position for AMAK are as follows: Results of Operations Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 (thousands of dollars) (thousands of dollars) Sales $ 19,494 $ — $ 33,581 $ 2,256 Cost of sales 16,555 8,901 29,061 12,463 Gross profit (loss) $ 2,939 $ (8,901 ) $ 4,520 $ (10,207 ) General, administrative and other expenses 3,265 1,971 5,166 4,559 Net Loss $ (326 ) $ (10,872 ) $ (646 ) $ (14,766 ) Depreciation and amortization 8,281 7,609 15,982 10,664 Net income (loss) before depreciation and amortization $ 7,955 $ (3,263 ) $ 15,336 $ (4,102 ) Financial Position June 30, December 31, 2018 2017 (thousands of dollars) Current assets $ 33,273 $ 23,333 Noncurrent assets 228,733 237,875 Total assets $ 262,006 $ 261,208 Current liabilities $ 22,873 $ 24,439 Long term liabilities 71,520 68,837 Shareholders' equity 167,613 167,932 $ 262,006 $ 261,208 The equity in the income or loss of AMAK reflected on the consolidated statements of income for the three months and six months ended June 30, 2018 , and 2017 , is comprised of the following: Three Months Ended Six Months Ended 2018 2017 2018 2017 (thousands of dollars) (thousands of dollars) AMAK Net Loss $ (326 ) $ (10,872 ) $ (646 ) $ (14,766 ) Company's share of loss reported by AMAK $ (109 ) $ (3,635 ) $ (216 ) $ (4,938 ) Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK 337 337 674 674 Equity in earnings (loss) of AMAK $ 228 $ (3,298 ) $ 458 $ (4,264 )

GENERAL (Details)

GENERAL (Details)	6 Months Ended
	Jun. 30, 2018segment
Noncontrolling Interest [Line Items]
Number of operating segments	2
Al Masane Al Kobra (AMAK) [Member]
Noncontrolling Interest [Line Items]
Percentage of ownership	33.00%
Pioche Ely Valley Mines, Inc. ("PEVM") [Member]
Noncontrolling Interest [Line Items]
Percentage of ownership	55.00%

RECENT ACCOUNTING PRONOUNCEME41

RECENT ACCOUNTING PRONOUNCEMENTS (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Federal corporate tax rate	21.00%	35.00%

TRADE RECEIVABLES (Details)

TRADE RECEIVABLES (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Trade receivables	$ 26,895	$ 26,079
Less allowance for doubtful accounts	(428)	(300)
Trade receivables, net	$ 26,467	$ 25,779

PREPAID EXPENSES AND OTHER AS43

PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid license	$ 1,919	$ 1,919
Prepaid catalyst	682	779
Prepaid insurance	115	0
Spare parts	1,349	954
Other prepaid expenses and assets	1,123	772
Total	$ 5,188	$ 4,424

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw material	$ 3,147	$ 3,703
Work in process	0	27
Finished products	13,856	14,720
Total inventory	17,003	18,450
Products in transit	$ 3,900	$ 3,700

PLANT, PIPELINE AND EQUIPMENT45

PLANT, PIPELINE AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total plant, pipeline and equipment	$ 260,416		$ 260,416		$ 244,982
Less accumulated depreciation	(68,332)		(68,332)		(63,240)
Net plant, pipeline and equipment	192,084		192,084		181,742
Interest capitalized for construction	427	$ 287	731	$ 660
Capitalized labor costs	900	900	2,100	1,600
Amortization relating to the platinum catalyst	0	$ 0	0	$ 25
Platinum Catalyst Metal [Member]
Property, Plant and Equipment [Line Items]
Total plant, pipeline and equipment	1,612		1,612		1,612
Land [Member]
Property, Plant and Equipment [Line Items]
Total plant, pipeline and equipment	5,428		5,428		5,428
Plant, Pipeline and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total plant, pipeline and equipment	189,866		189,866		186,946
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total plant, pipeline and equipment	$ 63,510		$ 63,510		$ 50,996

GOODWILL AND INTANGIBLE ASSET46

GOODWILL AND INTANGIBLE ASSETS, NET - Finite and Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Intangible assets subject to amortization (Definite-lived)
Gross	$ 24,548		$ 24,548		$ 24,548
Accumulated Amortization	(7,026)		(7,026)		(6,095)
Total	17,522		17,522		18,453
Intangible assets not subject to amortization [Abstract]
Gross intangible assets	26,903		26,903		26,903
Net intangible assets	19,877		19,877		20,808
Amortization of intangible assets	465	$ 466	931	$ 931
Emissions Allowance [Member]
Intangible assets not subject to amortization [Abstract]
Intangible assets not subject to amortization (Indefinite-lived)	197		197		197
Trade Name [Member]
Intangible assets not subject to amortization [Abstract]
Intangible assets not subject to amortization (Indefinite-lived)	2,158		2,158		2,158
Customer Relationships [Member]
Intangible assets subject to amortization (Definite-lived)
Gross	16,852		16,852		16,852
Accumulated Amortization	(4,213)		(4,213)		(3,651)
Total	12,639		12,639		13,201
Non-compete Agreements [Member]
Intangible assets subject to amortization (Definite-lived)
Gross	94		94		94
Accumulated Amortization	(71)		(71)		(61)
Total	23		23		33
Licenses and Permits [Member]
Intangible assets subject to amortization (Definite-lived)
Gross	1,471		1,471		1,471
Accumulated Amortization	(443)		(443)		(390)
Total	1,028		1,028		1,081
Developed Technology [Member]
Intangible assets subject to amortization (Definite-lived)
Gross	6,131		6,131		6,131
Accumulated Amortization	(2,299)		(2,299)		(1,993)
Total	$ 3,832		$ 3,832		$ 4,138

GOODWILL AND INTANGIBLE ASSET47

GOODWILL AND INTANGIBLE ASSETS, NET - Expected Future Amortization Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Total	$ 17,522	$ 18,453
Remainder of 2018	931
2,019	1,856
2,020	1,842
2,021	1,837
2,022	1,822
2,023	1,822
Thereafter	7,412
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Total	12,639	13,201
Remainder of 2018	562
2,019	1,123
2,020	1,123
2,021	1,123
2,022	1,123
2,023	1,123
Thereafter	6,462
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Total	23	33
Remainder of 2018	9
2,019	14
2,020	0
2,021	0
2,022	0
2,023	0
Thereafter	0
Licenses and Permits [Member]
Finite-Lived Intangible Assets [Line Items]
Total	1,028	1,081
Remainder of 2018	53
2,019	106
2,020	106
2,021	101
2,022	86
2,023	86
Thereafter	490
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Total	3,832	$ 4,138
Remainder of 2018	307
2,019	613
2,020	613
2,021	613
2,022	613
2,023	613
Thereafter	$ 460

NET INCOME PER COMMON SHARE A48

NET INCOME PER COMMON SHARE ATTRIBUTABLE TO TRECORA RESOURCES (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic Net Income per Share:
Net Income Attributable to Trecora Resources	$ 2,215		$ 832	$ 4,567	$ 2,319
Net Income Attributable to Trecora Resources (in shares)	24,370,000		24,256,000	24,354,000	24,248,000
Net Income Attributable to Trecora Resources (in dollars per share)	$ 0.09		$ 0.03	$ 0.19	$ 0.10
Unvested restricted stock units (in shares)	349,000		379,000	376,000	350,000
Dilutive stock options outstanding (in shares)	295,000		399,000	389,000	446,000
Diluted Net Income per Share:
Net Income Attributable to Trecora Resources	$ 2,215		$ 832	$ 4,567	$ 2,319
Net Income Attributable to Trecora Resources (in shares)	25,014,000		25,034,000	25,119,000	25,044,000
Net Income Attributable to Trecora Resources (in dollars per share)	$ 0.09		$ 0.03	$ 0.18	$ 0.09
Potential common stock shares issuable upon exercise of options (in shares)				924,860	1,334,087
Treasury Stock [Member]
Class of Stock [Line Items]
Number of stock exchanged (in shares)		65,000
Al Masane Al Kobra (AMAK) [Member]
Class of Stock [Line Items]
Number of stock exchanged (in shares)		24,489

ACCRUED LIABILITIES (Details)

ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accrued Liabilities, Current [Abstract]
Accrued state taxes	$ 295	$ 272
Accrued property taxes	900	0
Accrued payroll	910	1,407
Accrued interest	31	30
Accrued officer compensation	600	500
Other	2,902	1,752
Total	$ 5,638	$ 3,961

LIABILITIES AND LONG-TERM DEB50

LIABILITIES AND LONG-TERM DEBT - Ratios and Other Information (Details)	6 Months Ended
	Jun. 30, 2018
Maximum Consolidated Leverage Ratio [Abstract]
Maximum consolidated leverage ratio, March 31, 2017	4
Maximum consolidated leverage ratio, June 30, 2017	4.25
Maximum consolidated leverage ratio, September 30, 2017	3.75
Maximum consolidated leverage ratio, December 31, 2017	3.50
Maximum consolidated leverage ratio, March 31, 2018 and each fiscal quarter thereafter	3.25
Minimum Consolidated Fixed Charge Coverage Ratio [Abstract]
Minimum consolidated fixed charge coverage ratio, March 31, 2017	1.10
Minimum consolidated fixed charge coverage ratio, June 30, 2017	1.05
Minimum consolidated fixed charge coverage ratio, September 30, 2017	1.05
Minimum consolidated fixed charge coverage ratio, December 31, 2017	1.1
Minimum consolidated fixed charge coverage ratio, March 31, 2018 and each fiscal quarter thereafter	1.25
Minimum [Member]
Leverage Ratios [Abstract]
Commitment fee	0.25%
Maximum [Member]
Leverage Ratios [Abstract]
Commitment fee	0.375%
Leverage Ratio, Less than 1.50 to 1.00 [Member]
Leverage Ratios [Abstract]
Commitment fee	0.25%
Leverage Ratio, Less than 1.50 to 1.00 [Member] | Maximum [Member]
Leverage Ratios [Abstract]
Consolidated leverage ratio	1.50
Leverage Ratio, Greater than or Equal to 1.50 to 1.00 but Less than 2.00 to 1.00 [Member]
Leverage Ratios [Abstract]
Commitment fee	0.25%
Leverage Ratio, Greater than or Equal to 1.50 to 1.00 but Less than 2.00 to 1.00 [Member] | Minimum [Member]
Leverage Ratios [Abstract]
Consolidated leverage ratio	1.50
Leverage Ratio, Greater than or Equal to 1.50 to 1.00 but Less than 2.00 to 1.00 [Member] | Maximum [Member]
Leverage Ratios [Abstract]
Consolidated leverage ratio	2
Leverage Ratio, Greater than or Equal to 2.00 to 1.00 but Less than 3.00 to 1.00 [Member]
Leverage Ratios [Abstract]
Commitment fee	0.375%
Leverage Ratio, Greater than or Equal to 2.00 to 1.00 but Less than 3.00 to 1.00 [Member] | Minimum [Member]
Leverage Ratios [Abstract]
Consolidated leverage ratio	2
Leverage Ratio, Greater than or Equal to 2.00 to 1.00 but Less than 3.00 to 1.00 [Member] | Maximum [Member]
Leverage Ratios [Abstract]
Consolidated leverage ratio	3
Leverage Ratio, Greater than or Equal to 3.00 to 1.00 but Less than 3.50 to 1.00 [Member]
Leverage Ratios [Abstract]
Commitment fee	0.375%
Leverage Ratio, Greater than or Equal to 3.00 to 1.00 but Less than 3.50 to 1.00 [Member] | Minimum [Member]
Leverage Ratios [Abstract]
Consolidated leverage ratio	3
Leverage Ratio, Greater than or Equal to 3.00 to 1.00 but Less than 3.50 to 1.00 [Member] | Maximum [Member]
Leverage Ratios [Abstract]
Consolidated leverage ratio	3.50
Leverage Ratio, Greater than or Equal to 3.50 to 1.00 [Member]
Leverage Ratios [Abstract]
Commitment fee	0.375%
Leverage Ratio, Greater than or Equal to 3.50 to 1.00 [Member] | Minimum [Member]
Leverage Ratios [Abstract]
Consolidated leverage ratio	3.50
London Interbank Offered Rate (LIBOR) [Member] | Leverage Ratio, Less than 1.50 to 1.00 [Member]
Leverage Ratios [Abstract]
Basis spread on variable rate	2.00%
London Interbank Offered Rate (LIBOR) [Member] | Leverage Ratio, Greater than or Equal to 1.50 to 1.00 but Less than 2.00 to 1.00 [Member]
Leverage Ratios [Abstract]
Basis spread on variable rate	2.25%
London Interbank Offered Rate (LIBOR) [Member] | Leverage Ratio, Greater than or Equal to 2.00 to 1.00 but Less than 3.00 to 1.00 [Member]
Leverage Ratios [Abstract]
Basis spread on variable rate	2.50%
London Interbank Offered Rate (LIBOR) [Member] | Leverage Ratio, Greater than or Equal to 3.00 to 1.00 but Less than 3.50 to 1.00 [Member]
Leverage Ratios [Abstract]
Basis spread on variable rate	2.75%
London Interbank Offered Rate (LIBOR) [Member] | Leverage Ratio, Greater than or Equal to 3.50 to 1.00 [Member]
Leverage Ratios [Abstract]
Basis spread on variable rate	3.00%
Base Rate [Member] | Leverage Ratio, Less than 1.50 to 1.00 [Member]
Leverage Ratios [Abstract]
Basis spread on variable rate	1.00%
Base Rate [Member] | Leverage Ratio, Greater than or Equal to 1.50 to 1.00 but Less than 2.00 to 1.00 [Member]
Leverage Ratios [Abstract]
Basis spread on variable rate	1.25%
Base Rate [Member] | Leverage Ratio, Greater than or Equal to 2.00 to 1.00 but Less than 3.00 to 1.00 [Member]
Leverage Ratios [Abstract]
Basis spread on variable rate	1.50%
Base Rate [Member] | Leverage Ratio, Greater than or Equal to 3.00 to 1.00 but Less than 3.50 to 1.00 [Member]
Leverage Ratios [Abstract]
Basis spread on variable rate	1.75%
Base Rate [Member] | Leverage Ratio, Greater than or Equal to 3.50 to 1.00 [Member]
Leverage Ratios [Abstract]
Basis spread on variable rate	2.00%

LIABILITIES AND LONG-TERM DEB51

LIABILITIES AND LONG-TERM DEBT LIABILITIES AND LONG-TERM DEBT - Additional Information (Details) - USD ($)	Oct. 01, 2014	Jun. 30, 2018	Dec. 31, 2017	Jul. 25, 2017	Jul. 24, 2017
Line of Credit Facility [Line Items]
Long-term debt outstanding		$ 105,416,000	$ 99,583,000
Current portion of long-term debt		8,061,000	8,061,000
Total long-term debt, less current portion including loan fees		97,015,000	91,021,000
Debt issuance costs		$ (340,000)	$ (501,000)
Interest rate on loan		4.38%	4.07%
Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee		0.25%
Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee		0.375%
Acquisition Term Loan [Member]
Line of Credit Facility [Line Items]
Long-term debt outstanding		$ 43,750,000	$ 47,250,000
Total long-term debt	$ 70,000,000
Amortization period for principal on acquisition term loan		10 years
Principal payable		$ 1,800,000
Current portion of long-term debt		7,000,000	7,000,000
Total long-term debt, less current portion including loan fees		36,800,000	40,300,000
Term Loan [Member]
Line of Credit Facility [Line Items]
Long-term debt outstanding		16,666,000	17,333,000
Principal payable		300,000
Current portion of long-term debt		1,300,000	1,300,000
Total long-term debt, less current portion including loan fees		15,700,000	16,000,000
Amount of multiple advance loan that was available to be borrowed		25,000,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		60,000,000		$ 60,000,000	$ 40,000,000
Long-term debt outstanding		45,000,000	$ 35,000,000
Available remaining borrowing capacity		14,900,000
Available remaining borrowing capacity to maintain covenant compliance		$ 10,000,000

LIABILITIES AND LONG-TERM DEB52

LIABILITIES AND LONG-TERM DEBT LIABILITIES AND LONG-TERM DEBT - Schedule of Carrying Amounts of and Issuance Costs of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Total debt, gross	$ 105,416	$ 99,583
Debt issuance costs	(340)	(501)
Total long-term debt	105,076	99,082
Less current portion including loan fees	8,061	8,061
Total long-term debt, less current portion including loan fees	97,015	91,021
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Total debt, gross	45,000	35,000
Acquisition Term Loan [Member]
Line of Credit Facility [Line Items]
Total debt, gross	43,750	47,250
Less current portion including loan fees	7,000	7,000
Total long-term debt, less current portion including loan fees	36,800	40,300
Term Loan [Member]
Line of Credit Facility [Line Items]
Total debt, gross	16,666	17,333
Less current portion including loan fees	1,300	1,300
Total long-term debt, less current portion including loan fees	$ 15,700	$ 16,000

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2008
Debt Instrument, Fair Value Disclosure [Abstract]
Outstanding liability	$ 0	$ 0
Interest Rate Swap [Member]
Debt Instrument, Fair Value Disclosure [Abstract]
Term loan in pay fixed, receive variable interest rate swap			$ 10,000,000

DERIVATIVE INSTRUMENTS (Details

DERIVATIVE INSTRUMENTS (Details) - Interest Rate Swap [Member]	Mar. 21, 2008USD ($)
Derivative [Line Items]
Term loan in pay fixed, receive variable interest rate swap	$ 10,000,000
Term loan secured by plant, pipeline and equipment	$ 14,000,000
Derivative, variable interest rate	5.83%

STOCK-BASED COMPENSATION - Addi

STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 20, 2018	Jan. 17, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ (219)	$ 656	$ 372	$ 1,289
Restricted Stock Awards [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			0		$ 5
Shares granted (in shares)		251
Shares granted (in dollars per share)		$ 13.85
Restricted Stock Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)					102,317
Shares granted (in dollars per share)					$ 12.15
Restricted Stock Unit Awards [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			108		$ 144
Shares granted (in shares)	102,000
Shares granted (in dollars per share)	$ 12.15
Percentage of stock vests ratably over three years	50.00%
Vesting period of stock vests ratably over three years					3 years
Percentage of stock vests at the end of the three years	50.00%
Vesting period of stock vests at the end of three years					3 years
Restricted Stock Unit Awards [Member] | Officer [Member] | Vesting through 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			95	40	$ 207	40
Restricted Stock Unit Awards [Member] | Director [Member] | Vesting through 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			81	75	165	156
Restricted Stock Unit Awards [Member] | Officer 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			79	106	$ 176	211
Percentage of stock vests ratably over three years					50.00%
Vesting period of stock vests ratably over three years					3 years
Percentage of stock vests at the end of the three years					50.00%
Vesting period of stock vests at the end of three years					3 years
Restricted Stock Unit Awards [Member] | Officer and Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years
Restricted Stock Unit Awards [Member] | Officer and Key Employees [Member] | Vesting through 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			98	108	$ 202	215
Stock Options [Member] | Director [Member] | Vesting through 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			0	30	$ 0	60
Stock Options [Member] | Officer and Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years
Stock Options [Member] | Officer and Key Employees [Member] | Vesting through 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			0	298	$ 154	607
Stock Options [Member] | Mr. Hatem El Khalidi [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ (679)	$ 0	$ (679)	$ 0

STOCK-BASED COMPENSATION - Rest

STOCK-BASED COMPENSATION - Restricted Stock Unit Activity (Details) - Restricted Stock Unit Awards [Member]	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Shares of Restricted Stock Units [Roll Forward]
Outstanding at beginning of period (in shares) | shares	387,702
Granted (in shares) | shares	102,317
Forfeited (in shares) | shares	(48,631)
Vested (in shares) | shares	(92,513)
Outstanding at end of period (in shares) | shares	348,875
Weighted Average Grant Date Price per Share [Abstract]
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 11.39
Granted (in dollars per share) | $ / shares	12.15
Forfeited (in dollars per share) | $ / shares	10.88
Vested (in dollars per share) | $ / shares	11.79
Outstanding at end of period (in dollars per share) | $ / shares	$ 11.53

STOCK-BASED COMPENSATION - Stoc

STOCK-BASED COMPENSATION - Stock Option and Warrant Awards (Details) - Stock Options [Member]	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Stock Options and Warrants [Roll Forward]
Outstanding at beginning of period (in shares) | shares	1,323,587
Granted (in shares) | shares	0
Exercised (in shares) | shares	(198,727)
Cancelled (in shares) | shares	(200,000)
Forfeited (in shares) | shares	0
Outstanding at end of period (in shares) | shares	924,860
Exercisable, end of period (in shares) | shares	924,860
Weighted Average Exercise Price Per Share [Roll Forward]
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 7.82
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	5.43
Cancelled (in dollars per share) | $ / shares	3.40
Forfeited (in dollars per share) | $ / shares	0
Outstanding at end of period (in dollars per share) | $ / shares	9.29
Exercisable, end of period (in dollars per share) | $ / shares	$ 9.29
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, weighted average remaining contractual life	4 years 8 months 12 days
Exercisable, weighted average remaining contractual life	4 years 8 months 12 days

SEGMENT INFORMATION (Details)

SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenues	$ 68,106	$ 62,115	$ 139,847	$ 117,657
Operating profit (loss) before depreciation and amortization	6,425	7,730	13,060	14,510
Operating profit (loss)	3,397	5,162	7,006	9,354
Profit (loss) before taxes	2,811	1,164	5,753	3,712
Depreciation and amortization	3,028	2,568	6,054	5,156
Capital expenditures	4,406	13,952	15,434	27,833
Trade receivables, net	26,467		26,467		$ 25,779
Goodwill and intangible assets, net	41,675		41,675		42,606
Total assets	333,628		333,628		327,326
Product Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	63,569	57,016	130,268	107,915
Trade receivables, net	24,016		24,016		22,882
Processing Fees [Member]
Segment Reporting Information [Line Items]
Total revenues	4,537	5,099	9,579	9,742
Trade receivables, net	2,451		2,451		2,897
Operating Segments [Member] | Petrochemical [Member]
Segment Reporting Information [Line Items]
Total revenues	57,820	52,579	120,133	98,458
Operating profit (loss) before depreciation and amortization	6,095	8,761	14,488	16,975
Operating profit (loss)	4,440	7,217	11,119	13,875
Profit (loss) before taxes	3,859	6,598	9,913	12,601
Depreciation and amortization	1,655	1,544	3,369	3,100
Capital expenditures	3,529	9,021	13,812	17,777
Goodwill and intangible assets, net	0		0		0
Total assets	279,161		279,161		265,213
Operating Segments [Member] | Petrochemical [Member] | Product Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	56,135	50,508	116,420	94,899
Trade receivables, net	20,377		20,377		20,211
Operating Segments [Member] | Petrochemical [Member] | Processing Fees [Member]
Segment Reporting Information [Line Items]
Total revenues	1,685	2,071	3,713	3,559
Trade receivables, net	671		671		983
Operating Segments [Member] | Specialty Wax [Member]
Segment Reporting Information [Line Items]
Total revenues	10,286	9,536	19,881	19,199
Operating profit (loss) before depreciation and amortization	1,164	810	1,554	1,555
Operating profit (loss)	(201)	(198)	(1,115)	(469)
Profit (loss) before taxes	(506)	(269)	(1,687)	(559)
Depreciation and amortization	1,365	1,008	2,669	2,024
Capital expenditures	877	4,931	1,622	10,056
Goodwill and intangible assets, net	41,675		41,675		42,606
Total assets	115,696		115,696		117,579
Operating Segments [Member] | Specialty Wax [Member] | Product Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	7,434	6,508	13,817	13,016
Trade receivables, net	3,639		3,639		2,671
Operating Segments [Member] | Specialty Wax [Member] | Processing Fees [Member]
Segment Reporting Information [Line Items]
Total revenues	2,852	3,028	6,064	6,183
Trade receivables, net	1,780		1,780		1,914
Corporate [Member]
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Operating profit (loss) before depreciation and amortization	(834)	(1,841)	(2,982)	(4,020)
Operating profit (loss)	(842)	(1,857)	(2,998)	(4,052)
Profit (loss) before taxes	(542)	(5,165)	(2,473)	(8,330)
Depreciation and amortization	8	16	16	32
Capital expenditures	0	0	0	0
Goodwill and intangible assets, net	0		0		0
Total assets	92,857		92,857		97,880
Corporate [Member] | Product Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Trade receivables, net	0		0		0
Corporate [Member] | Processing Fees [Member]
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Trade receivables, net	0		0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	0	0	(167)	0
Operating profit (loss) before depreciation and amortization	0	0	0	0
Operating profit (loss)	0	0	0	0
Profit (loss) before taxes	0	0	0	0
Depreciation and amortization	0	0	0	0
Capital expenditures	0	0	0	0
Goodwill and intangible assets, net	0		0		0
Total assets	(154,086)		(154,086)		(153,346)
Eliminations [Member] | Product Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	0	0	31	0
Trade receivables, net	0		0		0
Eliminations [Member] | Processing Fees [Member]
Segment Reporting Information [Line Items]
Total revenues	0	$ 0	(198)	$ 0
Trade receivables, net	$ 0		$ 0		$ 0

INCOME TAXES (Details)

INCOME TAXES (Details) $ in Thousands	Mar. 31, 2018USD ($)
Research and Development [Member]
Tax Credit Carryforward [Line Items]
Refund claims amount	$ 350

POST-RETIREMENT OBLIGATIONS (De

POST-RETIREMENT OBLIGATIONS (Details) - Postretirement Benefits [Member] - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Mr. Hatem El Khalidi [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Post retirement liability	$ 1	$ 1
Nicholas Carter [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Post retirement liability	0.2	$ 0.3
Connie Cook [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Post retirement liability	$ 0.2

INVESTMENT IN AMAK - Additional

INVESTMENT IN AMAK - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018shares	Jun. 30, 2018USD ($)ر.س / $	Mar. 30, 2018	Dec. 31, 2017USD ($)
Treasury Stock [Member]
Schedule of Equity Method Investments [Line Items]
Number of stock exchanged (in shares) | shares	65,000
AMAK [Member]
Schedule of Equity Method Investments [Line Items]
Number of stock exchanged (in shares) | shares	24,489
Percentage investment in equity method investment	33.41%	33.40%	33.44%	33.40%
Investment in equity method investment | $		$ 45,500		$ 45,100
Exchange rate | ر.س / $		3.75
Amount receivable for unreimbursed travel expenses | $		$ 204		$ 121

INVESTMENT IN AMAK - Summary of

INVESTMENT IN AMAK - Summary of Operating Results (Details) - AMAK [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]
Sales	$ 19,494	$ 0	$ 33,581	$ 2,256
Cost of sales	16,555	8,901	29,061	12,463
Gross profit (loss)	2,939	(8,901)	4,520	(10,207)
General, administrative and other expenses	3,265	1,971	5,166	4,559
Net Loss	(326)	(10,872)	(646)	(14,766)
Depreciation and amortization	8,281	7,609	15,982	10,664
Net income (loss) before depreciation and amortization	$ 7,955	$ (3,263)	$ 15,336	$ (4,102)

INVESTMENT IN AMAK - Summary 63

INVESTMENT IN AMAK - Summary of Financial Position (Details) - AMAK [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Current assets	$ 33,273	$ 23,333
Noncurrent assets	228,733	237,875
Total assets	262,006	261,208
Current liabilities	22,873	24,439
Long term liabilities	71,520	68,837
Shareholders' equity	167,613	167,932
Total liabilities and Shareholders' equity	$ 262,006	$ 261,208

INVESTMENT IN AMAK - Equity in

INVESTMENT IN AMAK - Equity in the Income or Loss of Equity Method Investment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]
Equity in earnings (loss) of AMAK	$ 228	$ (3,298)	$ 458	$ (4,264)
AMAK [Member]
Schedule of Equity Method Investments [Line Items]
AMAK Net Loss	(326)	(10,872)	(646)	(14,766)
Company's share of loss reported by AMAK	(109)	(3,635)	(216)	(4,938)
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK	337	337	674	674
Equity in earnings (loss) of AMAK	$ 228	$ (3,298)	$ 458	$ (4,264)

RELATED PARTY TRANSACTIONS (Det

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Director [Member]
Related Party Transaction [Line Items]
Consulting fees		$ 0		$ 27
Executive Chairman [Member]
Related Party Transaction [Line Items]
Consulting fees	$ 19	$ 18	$ 50	$ 37
Period of consulting agreement			3 years

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands, ر.س in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2019USD ($)	Jun. 30, 2018SAR (ر.س)	Oct. 24, 2010USD ($)	Oct. 24, 2010SAR (ر.س)
Guarantor Obligations [Line Items]
Operating lease, rental expense	$ 1,000	$ 800	$ 2,100	$ 1,600
Shortfall fee expenses	400	900	500	1,800
Expenses for environmental monitoring, compliance, and improvements	154	$ 160	303	$ 325
Saudi Industrial Development Fund Limited Guarantee [Member]
Guarantor Obligations [Line Items]
Loan guarantee							41.00%	41.00%
Principal amount of loan guaranteed							$ 88,000	ر.س 330.0
Amount of maximum exposure	$ 81,300		$ 81,300			ر.س 305.0	$ 36,100	ر.س 135.3
Scenario, Forecast [Member] | Saudi Industrial Development Fund Limited Guarantee [Member]
Guarantor Obligations [Line Items]
Amount of maximum exposure					$ 8,000

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details)	Jul. 31, 2018USD ($)	Jul. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Jul. 25, 2017USD ($)	Jul. 24, 2017USD ($)
Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Maximum borrowing capacity			$ 60,000,000	$ 60,000,000	$ 40,000,000
Available remaining borrowing capacity			14,900,000
Amended and Restated Credit Agreement, Third Amendment [Member] | Various Lenders [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Borrowings outstanding			19,000,000
Amended and Restated Credit Agreement, Third Amendment [Member] | Various Lenders [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Maximum borrowing capacity		$ 60,000,000
Amended and Restated Credit Agreement, Fourth Amendment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Additional amount allowed to borrow, accordion feature	$ 50,000,000
Amended and Restated Credit Agreement, Fourth Amendment [Member] | Various Lenders [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Maximum borrowing capacity	75,000,000
Available remaining borrowing capacity	55,900,000
Term Loan [Member] | Amended and Restated Credit Agreement, Third Amendment [Member]
Subsequent Event [Line Items]
Borrowings outstanding			$ 87,500,000
Term Loan [Member] | Amended and Restated Credit Agreement, Fourth Amendment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Total amount available under loan	$ 87,500,000
Minimum [Member] | Amended and Restated Credit Agreement, Fourth Amendment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Commitment fee on unused portion	0.20%
Consolidated fixed charge coverage ratio	1.15
Maximum [Member] | Amended and Restated Credit Agreement, Fourth Amendment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Commitment fee on unused portion	0.30%
Consolidated leverage ratio	3.50
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Amended and Restated Credit Agreement, Fourth Amendment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Basis spread on variable rate	1.25%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Amended and Restated Credit Agreement, Fourth Amendment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Basis spread on variable rate	2.25%
Base Rate [Member] | Minimum [Member] | Amended and Restated Credit Agreement, Fourth Amendment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Basis spread on variable rate	0.25%
Base Rate [Member] | Maximum [Member] | Amended and Restated Credit Agreement, Fourth Amendment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Basis spread on variable rate	1.25%