NACCO Industries (NC) 10-K 3 Mar 21 2020 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 19, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-9172
Entity Registrant Name	NACCO INDUSTRIES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	34-1505819
Entity Address, Address Line One	5875 Landerbrook Drive,
Entity Address, Address Line Two	Suite 220
Entity Address, City or Town	Cleveland,
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44124-4069
City Area Code	440
Local Phone Number	229-5151
Title of 12(b) Security	Class A Common Stock, $1 par value per share
Trading Symbol	NC
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 96,645,091
Documents Incorporated by Reference	Portions of the Company's Proxy Statement for its 2021 annual meeting of stockholders are incorporated herein by reference in Part III of this Form 10-K.
Entity Central Index Key	0000789933
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Shares Outstanding Class A
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		5,490,948
Shares Outstanding Class B
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		1,566,877

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenues	$ 128,432	$ 140,990
Cost of sales	111,463	109,862
Gross profit	16,969	31,128
Earnings of unconsolidated operations	60,203	63,883
Operating expenses
Selling, general and administrative expenses	53,062	53,783
Amortization of intangible assets	2,572	2,614
Gain on sale of assets	(269)	(206)
Asset impairment charges	8,359	0
Operating expenses	63,724	56,191
Operating profit	13,448	38,820
Other (income) expense
Interest expense	1,354	872
Interest income	(1,200)	(3,616)
Income from other unconsolidated affiliates	(239)	(1,300)
Closed mine obligations	1,641	1,537
Gain on equity securities	(1,226)	(1,545)
Other, net	(1,140)	(527)
Other (income) expense	(810)	(4,579)
Income before income tax (benefit) provision	14,258	43,399
Income tax (benefit) provision	(535)	3,767
Net income	$ 14,793	$ 39,632
Earnings per share:
Basic earnings per share (USD per share)	$ 2.11	$ 5.68
Diluted earnings per share (USD per share)	$ 2.10	$ 5.66
Basic weighted average shares outstanding (in shares)	7,026	6,974
Diluted weighted average shares outstanding (in shares)	7,057	7,007

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 14,793	$ 39,632
Other comprehensive income
Current period pension and postretirement plan adjustment, net of $213 tax benefit and $226 tax expense in 2020 and 2019, respectively	(697)	758
Pension settlement, net of $202 tax benefit in 2019	0	671
Reclassification of pension and postretirement adjustments into earnings, net of $129 and $90 tax benefit in 2020 and 2019, respectively	435	845
Total other comprehensive income	(262)	2,274
Comprehensive income	$ 14,531	$ 41,906

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Current period pension and postretirement plan adjustment, tax (benefit) expense	$ (213)	$ 226
Pension settlement, tax		202
Reclassification of pension and post retirement adjustments into earnings, tax benefit	$ 129	$ 90

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 88,450	$ 122,892
Trade accounts receivable	18,894	15,444
Accounts receivable from affiliates	4,764	6,411
Inventories	47,551	40,465
Refundable federal income taxes	17,615	8,928
Prepaid expenses and other	10,872	6,528
Total current assets	188,146	200,668
Property, plant and equipment, net	172,417	138,061
Intangibles, net	35,330	37,902
Investment in unconsolidated subsidiaries	28,978	24,611
Operating lease right-of-use assets	10,324	11,398
Other non-current assets	40,984	32,133
Total assets	476,179	444,773
Current liabilities
Accounts payable	5,522	9,374
Accounts payable to affiliates	125	577
Revolving credit agreements	20,000	7,000
Current portion of borrowings outstanding	2,112	795
Asset retirement obligations	1,844	2,285
Accrued payroll	14,430	19,583
Deferred compensation	0	13,465
Other current liabilities	8,224	8,887
Total current liabilities	52,257	61,966
Long-term debt	24,353	17,148
Operating lease liabilities	11,196	12,448
Asset retirement obligations	39,888	34,574
Pension and other postretirement obligations	8,838	8,807
Deferred income taxes	17,550	12,338
Liability for uncertain tax positions	9,413	1,912
Other long-term liabilities	12,060	6,188
Total liabilities	175,555	155,381
Common stock:
Capital in excess of par value	10,895	8,911
Retained earnings	294,270	284,852
Accumulated other comprehensive loss	(11,599)	(11,337)
Total stockholders’ equity	300,624	289,392
Total liabilities and equity	476,179	444,773
Class A Common Stock
Common stock:
Common stock	5,490	5,397
Class B Common Stock
Common stock:
Common stock	$ 1,568	$ 1,569

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical)	Dec. 31, 2020$ / sharesshares	Dec. 31, 2019$ / sharesshares
Class A Common Stock
Common stock, par value (USD per share) | $ / shares	$ 1	$ 1
Common stock, shares outstanding (in shares) | shares	5,489,615	5,397,458
Class B Common Stock
Common stock, par value (USD per share) | $ / shares	$ 1	$ 1
Common stock, shares outstanding (in shares) | shares	1,568,210	1,568,670
Common stock, convertible conversion ratio	1	1

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net income	$ 14,793	$ 39,632
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	18,114	16,240
Amortization of deferred financing fees	334	334
Deferred income taxes	7,517	8,698
Stock-based compensation	3,078	4,924
Gain on sale of assets	(269)	(206)
Inventory impairment charge	1,973	0
Other asset impairment charges	8,359	0
Other	(3,786)	(7,405)
Working capital changes:
Affiliates receivable/payable	20	1,903
Accounts receivable	42	8,221
Inventories	(9,361)	(9,256)
Other current assets	(2,582)	1,432
Accounts payable	(10,622)	(388)
Income taxes receivable/payable	(10,790)	(5,447)
Other current liabilities	(19,306)	(5,898)
Net cash (used for) provided by operating activities	(2,486)	52,784
Investing Activities
Expenditures for property, plant and equipment	(30,187)	(24,664)
Acquisition of mineral interests	(14,181)	0
Proceeds from the sale of assets	571	4,572
Purchase of equity securities	(2,000)	0
Other	(187)	(170)
Net cash used for investing activities	(45,984)	(20,262)
Financing Activities
Net additions to revolving credit agreement	14,000	12,000
Additions to long-term debt	7,427	2,000
Reductions to long-term debt	(1,354)	(742)
Cash dividends paid	(5,375)	(5,132)
Purchase of treasury shares	(1,002)	(3,010)
Other	332	(3)
Net cash provided by financing activities	14,028	5,113
Cash and Cash Equivalents
Total (decrease) increase for the year	(34,442)	37,635
Balance at the beginning of the year	122,892	85,257
Balance at the end of the year	$ 88,450	$ 122,892

CONSOLIDATED STATEMENTS OF EQUI

CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common StockClass A Common Stock	Common StockClass B Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance, beginning of period at Dec. 31, 2018	$ 250,704	$ 5,352	$ 1,569	$ 7,042	$ 250,352	$ (13,611)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	4,924	117		4,807
Purchase of treasury shares	(3,010)	(72)		(2,938)
Net income	39,632				39,632
Cash dividends on common stock	(5,132)				(5,132)
Current period other comprehensive income, net of tax	758					758
Pension settlement, net of tax	671					671
Reclassification adjustment to net income, net of tax	845					845
Balance, end of period at Dec. 31, 2019	289,392	5,397	1,569	8,911	284,852	(11,337)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	3,078	124		2,954
Purchase of treasury shares	(1,002)	(32)		(970)
Conversion of Class B to Class A shares	0	1	(1)
Net income	14,793				14,793
Cash dividends on common stock	(5,375)				(5,375)
Current period other comprehensive income, net of tax	(697)					(697)
Pension settlement, net of tax	0
Reclassification adjustment to net income, net of tax	435					435
Balance, end of period at Dec. 31, 2020	$ 300,624	$ 5,490	$ 1,568	$ 10,895	$ 294,270	$ (11,599)

CONSOLIDATED STATEMENTS OF EQ_2

CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Cash dividends on Class A and Class B common stock (USD per share)	$ 0.7675	$ 0.7350

Principles of Consolidation and

Principles of Consolidation and Nature of Operations	12 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of Consolidation and Nature of Operations	Principles of Consolidation and Nature of Operations The Consolidated Financial Statements include the accounts of NACCO Industries, Inc. ® (“NACCO” or the "Company"). NACCO, through a portfolio of mining and natural resources businesses, operates under three business segments: Coal Mining, North American Mining ("NAMining") and Minerals Management. The Coal Mining segment operates surface coal mines under long-term contracts with power generation companies and an activated carbon producer pursuant to a service-based business model. The NAMining segment provides value-added contract mining and other services for producers of aggregates, lithium and other minerals. The Minerals Management segment acquires and promotes the development of oil, gas and coal mineral interests, generating income primarily from royalty-based lease payments from third parties. In addition, the Company has a business providing stream and wetland mitigation solutions. The Company also has unallocated items not directly attributable to a reportable segment. Intercompany accounts and transactions are eliminated in consolidation. See Note 15 to the Consolidated Financial Statements for further discussion of segment reporting. The Company’s operating segments are further described below: Coal Mining Segment During 2020, the Company's operating coal mines were: Bisti Fuels Company, LLC (“Bisti”), Caddo Creek Resources Company, LLC (“Caddo Creek”), Camino Real Fuels, LLC (“Camino Real”), The Coteau Properties Company (“Coteau”), Coyote Creek Mining Company, LLC (“Coyote Creek”), Demery Resources Company, LLC (“Demery”), The Falkirk Mining Company (“Falkirk”), Mississippi Lignite Mining Company (“MLMC”) and The Sabine Mining Company (“Sabine”). The Company operates these mines as the North American Coal Corporation ® ("NACoal"). Sabine operates the Sabine Mine in Texas. All production from Sabine is delivered to Southwestern Electric Power Company's (“SWEPCO”) Henry W. Pirkey Plant (the “Pirkey Plant”). SWEPCO is an American Electric Power (“AEP”) company. On November 5, 2020, AEP announced it intends to retire the Pirkey Plant in 2023 in order to comply with the U.S. Environmental Protection Agency’s Coal Combustion Residuals rule. The Sabine Mine delivered 1.9 million and 2.6 million tons to the Pirkey Plant in 2020 and 2019, respectively. During 2020, SWEPCO reduced its expected future annual delivery requirements to be between 1.4 million and 1.7 million tons. The Sabine Mine contributed $3.9 million and $4.6 million to Earnings from Unconsolidated Operations during 2020 and 2019, respectively. Coteau operates the Freedom Mine in North Dakota. All coal production from the Freedom Mine is delivered to Basin Electric Power Cooperative (“Basin Electric”). Basin Electric utilizes the coal at the Great Plains Synfuels Plant (the “Synfuels Plant”), Antelope Valley Station and Leland Olds Station. The Synfuels Plant is a coal gasification plant that manufactures synthetic natural gas and produces fertilizers, solvents, phenol, carbon dioxide, and other chemical products for sale. On November 5, 2020, Basin Electric informed its employees and Coteau that it is considering changes that may result in modifications to its Synfuels Plant that could potentially reduce or eliminate coal requirements at the Synfuels Plant beginning in 2026. Basin Electric indicated that if it decides to proceed with any changes that could reduce or eliminate the use of coal, the feedstock change is not expected to occur before 2026. As a result, coal deliveries to the Synfuels Plant are expected to continue until at least 2026. On September 30, 2020, Caddo Creek's customer, a division of Cabot Corporation, entered into a long-term supply agreement with a subsidiary of Advanced Emissions Solutions (“AES”) as well as an agreement for the sale of the Marshall Mine, operated by Caddo Creek, to a subsidiary of AES. AES announced its intent to close the Marshall Mine. Caddo Creek entered into a contract with a subsidiary of AES to perform the required mine reclamation. The Marshall Mine delivered 0.1 million and 0.2 million tons during 2020 and 2019, respectively. The contract mining agreement between Camino Real and its customer, Dos Republicas Coal Partnership (“DRCP”), terminated effective July 1, 2020 as a result of the unexpected termination by Comisión Federal de Electricidad (“CFE”) of its coal supply contract with an affiliate of DRCP. The termination of the contract between CFE and DRCP eliminated DRCP’s need for coal from Camino Real's Eagle Pass Mine, and resulted in mine closure. Mine reclamation is the responsibility of DRCP. Camino Real has no legal obligation to perform mine reclamation. The Eagle Pass Mine delivered 0.3 million and 1.6 million tons during 2020 and 2019, respectively. On May 7, 2020, Great River Energy ("GRE"), Falkirk's customer, announced its intent to retire the Coal Creek Station power plant in the second half of 2022 and modify the Spiritwood Station power plant to be fueled by natural gas. As noted in the announcement, GRE is willing to consider opportunities to sell Coal Creek Station. Falkirk Mine is the sole supplier of lignite coal to Coal Creek Station pursuant to a long-term contract under which Falkirk also supplies approximately 0.3 million tons of lignite coal per year to Spiritwood Station. Falkirk delivered a total of 7.2 million and 7.4 million tons of lignite coal and contributed $16.1 million and $15.9 million to Earnings from Unconsolidated Operations during 2020 and 2019, respectively. At all operating coal mines other than MLMC, the Company is paid a management fee per ton of coal or heating unit (MMBtu) delivered. Each contract specifies the indices and mechanics by which fees change over time, generally in line with broad measures of U.S. inflation. The customers are responsible for funding all mine operating costs, including final mine reclamation, and directly or indirectly provide all of the capital required to build and operate the mine. This contract structure eliminates exposure to spot coal market price fluctuations while providing steady income and cash flow with minimal capital investment. Other than at Coyote Creek, debt financing provided by or supported by the customers is without recourse to NACCO and NACoal. See Note 17 for further discussion of Coyote Creek's guarantees. All operating coal mines other than MLMC meet the definition of a variable interest entity (“VIE”). In each case, NACCO is not the primary beneficiary of the VIE as it does not exercise financial control; therefore, NACCO does not consolidate the results of these operations within its financial statements. Instead, these contracts are accounted for as equity method investments. The income before income taxes associated with these VIE's is reported as Earnings of unconsolidated operations on the Consolidated Statements of Operations and the Company’s investment is reported on the line Investments in Unconsolidated Subsidiaries in the Consolidated Balance Sheets. The mines that meet the definition of a VIE are referred to collectively as the “Unconsolidated Subsidiaries.” For tax purposes, the Unconsolidated Subsidiaries are included within the NACCO consolidated U.S. tax return; therefore, the income tax expense line on the Consolidated Statements of Operations includes income taxes related to these entities. See Note 17 for further information on the Unconsolidated Subsidiaries. Camino Real and Caddo Creek previously met the definition of a VIE of which the Company was not the primary beneficiary and therefore NACCO did not consolidate the results of operations within its financial statements. As a result of the events described above, Camino Real and Caddo Creek are no longer VIEs. Camino Real’s and Caddo Creek's financial positions were consolidated within NACCO’s financial statements during the second quarter of 2020 and the fourth quarter of 2020, respectively. During 2020, the consolidation of these entities did not materially change the Company’s Consolidated Statements of Operations and Consolidated Balance Sheet. The MLMC contract is the only operating coal contract in which the Company is responsible for all operating costs, capital requirements and final mine reclamation; therefore, MLMC is consolidated within NACCO’s financial statements. MLMC sells coal to its customer at a contractually agreed-upon price which adjusts monthly, primarily based on changes in the level of established indices which reflect general U.S. inflation rates. NAMining Segment The NAMining segment provides value-added contract mining and other services for producers of aggregates, lithium and other minerals. The segment is a primary platform for the Company’s growth and diversification of mining activities outside of the coal industry. NAMining provides contract mining services for independently owned mines and quarries, creating value for its customers by performing the mining aspects of its customers’ operations. This allows customers to focus on their areas of expertise: materials handling and processing, product sales and distribution. NAMining operates primarily at limestone quarries in Florida, but is focused on expanding outside of Florida and into mining materials other than limestone. In addition, NAMining will serve as exclusive contract miner for the Thacker Pass lithium project in northern Nevada. NAMining utilizes both fixed price and management fee contract structures. Certain of the entities within the NAMining segment are VIEs and are accounted for under the equity method as Unconsolidated Subsidiaries. See Note 17 for further discussion. Minerals Management Segment The Minerals Management segment derives income primarily by leasing its royalty and mineral interests to third-party exploration and production companies, and, to a lesser extent, other mining companies, granting them the rights to explore, develop, mine, produce, market and sell gas, oil, and coal in exchange for royalty payments based on the lessees' sales of those minerals. During 2020, the Minerals Management segment acquired mineral interests in the Permian Basin in Texas and intends to make future acquisitions of mineral and royalty interests that meet the Company’s acquisition criteria as part of its growth strategy. The Company’s legacy royalty and mineral interests are located in Ohio (Utica and Marcellus shale natural gas), Louisiana (Haynesville shale and Cotton Valley formation natural gas), Mississippi (coal), Pennsylvania (coal, coalbed methane and Marcellus shale natural gas), Alabama (coal and coalbed methane and natural gas) and North Dakota (coal). The majority of the Company’s legacy reserves were acquired as part of its historical coal mining operations. Specialized employees in the Minerals Management segment also provide surface and mineral acquisition and lease maintenance services related to Company operations.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Use of Estimates: The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and judgments. These estimates and judgments affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities (if any) at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Cash and Cash Equivalents: Cash and cash equivalents include cash in banks and highly liquid investments with original maturities of three months or less. Inventories: Inventories are stated at the lower of cost or net realizable value. The weighted average method is used for inventory valuation. Property, Plant and Equipment, Net: Property, plant and equipment are initially recorded at cost. Depreciation, depletion and amortization are provided in amounts sufficient to amortize the cost of the assets, including assets recorded under finance leases, over their estimated useful lives using the straight-line method or the units-of-production method. Buildings and building improvements are depreciated over the life of the mine, which is generally 30 years. Estimated lives for machinery and equipment range from three Royalty Interests in Oil and Natural Gas Properties: The Company follows the successful efforts method of accounting for oil and natural gas operations. Under this method, costs to acquire mineral and royalty interests in oil and natural gas properties are capitalized when incurred. Acquisitions of royalty interests of oil and natural gas properties are considered asset acquisitions and are recorded at cost. During the year ended December 31, 2020, the Company closed on multiple acquisitions of mineral and royalty interests for total consideration of $14.2 million, of which $12.0 million closed in December 2020, $2.0 million closed in November 2020 and $0.2 million closed in August 2020. These acquisitions are all located in the Permian Basin in Texas. The Company did not acquire any mineral interests in 2019. Acquisition costs of proven royalty interests are amortized using the units of production method over the life of the property, which is estimated using proven reserves. For purposes of amortization, interests in oil and natural gas properties are grouped in a reasonable aggregation of properties with common geological structural features or stratigraphic condition. The Company did not recognize any amortization expense related to the Company’s royalty interests in oil and natural gas properties for the year ended December 31, 2020. The Company reviews and evaluates its royalty interests in oil and natural gas properties for impairment when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Proven oil and gas properties are reviewed for impairment when events and circumstances indicate a potential decline in the fair value of such properties below the carrying value, such as a downward revision of the reserve estimates or lower commodity prices. When such events or changes in circumstances occur, the Company estimates the undiscounted future cash flows expected in connection with the properties and compares such future cash flows to the carrying amounts of the properties to determine if the carrying amounts are recoverable. If the carrying value of the properties is determined to not be recoverable based on the undiscounted cash flows, an impairment charge is recognized by comparing the carrying value to the estimated fair value of the properties. Long-Lived Assets: The Company periodically evaluates long-lived assets for impairment when changes in circumstances or the occurrence of certain events indicate the carrying amount of an asset or asset group may not be recoverable. Upon identification of indicators of impairment, the Company evaluates the carrying value of the asset by comparing the estimated future undiscounted cash flows generated from the use of the asset or asset group and its eventual disposition with the asset's net carrying value. If the carrying value of an asset is considered impaired, an impairment charge is recorded for the amount that the carrying value of the long-lived asset or asset group exceeds its fair value. Fair value is estimated as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See Note 9 for further discussion of the Company's nonrecurring fair value measurements. At MLMC, the costs of mining operations are not reimbursed by MLMC's customer. As such, increased costs at MLMC or decreased revenues could materially reduce the Company's profitability. Any reduction in customer demand at MLMC, including reductions related to reduced mechanical availability of the customer’s power plant, would adversely affect the Company's operating results and could result in significant impairments. MLMC has approximately $135 million of long-lived assets, including property, plant and equipment and its coal supply agreement intangible asset, which are subject to periodic impairment analyses and review. Identifying and assessing whether impairment indicators exist, or if events or changes in circumstances have occurred, including assumptions about future power plant dispatch levels, changes in future sales price, operating costs and other factors that impact anticipated revenue and customer demand, requires significant judgment. Actual future operating results could differ significantly from these estimates, which may result in an impairment charge in a future period, which could have a substantial impact on the Company’s results of operations. Coal Supply Agreement: The coal supply agreement represents a long-term supply agreement with MLMC's customer and was recorded based on the fair value at the date of acquisition. The coal supply agreement is amortized based on units of production over the term of the agreement, which expires in 2032. The Company reviews identified intangible assets for impairment when changes in circumstances or the occurrence of certain events indicate potential impairment. Self-insurance Liabilities: The Company is generally self-insured for medical claims, certain workers’ compensation claims and certain closed mine liabilities. An estimated provision for claims reported and for claims incurred but not yet reported under the self-insurance programs is recorded and revised periodically based on industry trends, historical experience and management judgment. In addition, industry trends are considered within management's judgment for valuing claims. Changes in assumptions for such matters as legal judgments and settlements, inflation rates, medical costs and actual experience could cause estimates to change in the near term. Revenue Recognition: See Note 3 to the Consolidated Financial Statements for discussion of revenue recognition. Stock Compensation: The Company maintains long-term incentive programs that allow for the grant of shares of Class A common stock, subject to restrictions, as a means of retaining and rewarding selected employees for long-term performance and to increase ownership in the Company. Shares awarded under the plans are fully vested and entitle the stockholder to all rights of common stock ownership except that shares may not be assigned, pledged or otherwise transferred during the restriction period. In general, for shares awarded for years ended December 31, 2020 and December 31, 2019, the restriction period ends at the earliest of (i) three years after the participant's retirement date, (ii) three five The Company also has a stock compensation plan for non-employee directors of the Company under which a portion of the annual retainer for each non-employee director is paid in restricted shares of Class A common stock. For the year ended December 31, 2020, $100,000 ($150,000 for the Chairman) of the non-employee director's annual retainer of $162,000 ($250,000 for the Chairman) was paid in restricted shares of Class A common stock. For the year ended December 31, 2019, $95,000 ($150,000 for the Chairman) of the non-employee director's annual retainer of $155,000 ($250,000 for the Chairman) was paid in restricted shares of Class A common stock. Shares awarded under the plan are fully vested and entitle the stockholder to all rights of common stock ownership except that shares may not be assigned, pledged or otherwise transferred during the restriction period. In general, the restriction period ends at the earliest of (i) ten years from the award date, (ii) the date of the director's death or permanent disability, (iii) five years (or earlier with the approval of the Board of Directors) after the director's date of retirement from the Board of Directors, or (iv) the date the director has both retired from the Board of Directors and has reached age 70. Pursuant to this plan, the Company issued 42,744 and 22,258 shares related to the years ended December 31, 2020 and 2019, respectively. In addition to the mandatory retainer fee received in restricted stock, directors may elect to receive shares of Class A common stock in lieu of cash for up to 100% of the balance of their annual retainer, committee retainer and any committee chairman's fees. These voluntary shares are not subject to any restrictions. Total shares issued under voluntary elections were 745 in 2020 and 432 in 2019. After the issuance of these shares, there were 33,821 shares of Class A common stock available for issuance under this plan. Compensation expense related to these awards was $1.0 million ($0.8 million net of tax) and $1.1 million ($0.9 million net of tax) for the years ended December 31, 2020 and 2019, respectively. Compensation expense represents fair value based on the market price of the shares of Class A common stock at the grant date. Financial Instruments: Financial instruments held by the Company include cash and cash equivalents, accounts receivable, equity securities, accounts payable, revolving credit agreements and long-term debt. Fair Value Measurements: The Company accounts for the fair value measurement of its financial assets and liabilities in accordance with U.S. generally accepted accounting principles, which defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A fair value hierarchy requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. Described below are the three levels of inputs that may be used to measure fair value: Level 1 - Quoted prices in active markets that are accessible at the measurement date for identical assets or liabilities. Level 2 - Observable prices that are based on inputs not quoted on active markets, but corroborated by market data. Level 3 - Unobservable inputs are used when little or no market data is available. The hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The classification of fair value measurements within the hierarchy is based upon the lowest level of input that is significant to the measurement. See Note 9 for further discussion of fair value measurements.

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Nature of Performance Obligations At contract inception, the Company assesses the goods and services promised in its contracts with customers and identifies a performance obligation for each promised good or service that is distinct. To identify the performance obligations, the Company considers all of the goods or services promised in the contract regardless of whether they are explicitly stated or are implied by customary business practices. Each mine or mine area has a contract with its respective customer that represents a contract under ASC 606. For its consolidated entities, the Company’s performance obligations vary by contract and consist of the following: At MLMC, each MMBtu delivered during the production period is considered a separate performance obligation. Revenue is recognized at the point in time that control of each MMBtu of lignite transfers to the customer. Fluctuations in revenue from period to period generally result from changes in customer demand. On September 30, 2020, Caddo Creek entered into a fixed-price contract to perform mine reclamation. The management service to perform mine reclamation is the performance obligation accounted for as a series. Performance momentarily creates an asset that the customer simultaneously receives and consumes; therefore, control is transferred to the customer over time. Revenue from this contract is recognized over time utilizing the cost-to-cost method to measure the extent of progress toward completion of the performance obligation. The Company believes the cost-to-cost method is the most appropriate method to measure progress and that the rate at which costs are incurred to fulfill the contract best depicts the transfer of control to the customer. The extent of progress towards completion is measured based on the ratio of costs incurred to date compared to total estimated costs at completion, and revenue is recorded proportionally based on an estimated profit margin. At NAMining entities, the management service to oversee the operation of the equipment and delivery of limestone is the performance obligation accounted for as a series. Performance momentarily creates an asset that the customer simultaneously receives and consumes; therefore, control is transferred to the customer over time. Consistent with the conclusion that the customer simultaneously receives and consumes the benefits provided, an input-based measure of progress is appropriate. As each month of service is completed, revenue is recognized for the amount of actual costs incurred, plus the management fee and the general and administrative fee (as applicable). Fluctuations in revenue from period to period result from changes in customer demand and variances in reimbursable costs primarily due to increases and decreases in activity levels on individual contracts. The Company enters into royalty contracts which grant the right to explore, develop, produce and sell minerals controlled by the Company. These arrangements result in the transfer of mineral rights for a period of time; however, no rights to the actual land are granted other than access for purposes of exploration, development, production and sales. The mineral rights revert back to the Company at the expiration of the contract. Under these royalty contracts, granting exclusive right, title, and interest in and to minerals, if any, is the performance obligation. The performance obligation under these contracts represents a series of distinct goods or services whereby each day of access that is provided is distinct. The transaction price consists of a variable sales-based royalty and, in certain arrangements, a fixed component in the form of an up-front lease bonus payment. As the amount of consideration the Company will ultimately be entitled to is entirely susceptible to factors outside its control, the entire amount of variable consideration is constrained at contract inception. The Company believes that the pricing provisions of royalty contracts are customary in the industry. Up-front lease bonus payments represent the fixed portion of the transaction price and are recognized over the primary term of the contract, which is generally five years. Significant Judgments The Company’s contracts with its customers contain different types of variable consideration including, but not limited to, management fees that adjust based on coal volumes or MMBtu delivered or limestone tons, however, the terms of these variable payments relate specifically to our efforts to satisfy one or more, but not all of, the performance obligations (or to a specific outcome from satisfying the performance obligations), in the contract. Therefore, the Company allocates each variable payment (and subsequent changes to that payment) entirely to the specific performance obligation to which it relates. Management fees, as well as general and administrative fees, are also adjusted based on changes in specified indices (e.g., CPI) to compensate for general inflation changes. Index adjustments, if applicable, are effective prospectively. Certain contracts include reimbursement of actual costs incurred. Recognition of revenue and recognition of profit related to the Caddo Creek contract requires the use of assumptions and estimates related to the total contract value, the total cost at completion, and the measurement of progress towards completion of the performance obligation. Due to the nature of the contract, developing the estimated total contract value and total cost at completion requires the use of significant judgment. The total contract value includes variable consideration. The Company includes variable consideration in the transaction price at the most likely amount to be earned, based upon the Company’s assessment of expected performance. The Company records these amounts only to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Prior Period Performance Obligations The Company records royalty income in the month production is delivered to the purchaser. As a non-operator, the Company has limited visibility into the timing of when new wells start producing and production statements may not be received for 30 to 90 days or more after the date production is delivered. As a result, the Company is required to estimate the amount of production delivered to the purchaser and the price that will be received for the sale of the product. The expected sales volumes and prices for these properties are estimated and recorded in "Accounts receivable" in the accompanying Consolidated Balance Sheets. The difference between the Company’s estimates and the actual amounts received is recorded in the month that payment is received from the third party lessee. For the years ended December 31, 2020 and 2019, royalty income recognized in the reporting periods related to performance obligations satisfied in prior reporting periods was immaterial. Disaggregation of Revenue In accordance with ASC 606-10-50, the Company disaggregates revenue from contracts with customers into major goods and service lines and timing of transfer of goods and services. The Company determined that disaggregating revenue into these categories achieves the disclosure objective of depicting how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. The Company’s business consists of the Coal Mining, NAMining and Minerals Management segments as well as Unallocated Items. See Note 15 to the Consolidated Financial Statements for further discussion of segment reporting. The following table disaggregates revenue by major sources for the years ended December 31: Major Goods/Service Lines 2020 2019 Coal Mining $ 72,088 $ 68,701 NAMining 42,392 42,823 Minerals Management 14,721 30,119 Unallocated Items 2,133 790 Eliminations (2,902) (1,443) Total revenues $ 128,432 $ 140,990 Timing of Revenue Recognition Goods transferred at a point in time $ 68,073 $ 66,102 Services transferred over time 60,359 74,888 Total revenues $ 128,432 $ 140,990 Contract Balances The opening and closing balances of the Company’s current and long-term contract liabilities and receivables are as follows: Contract balances Trade accounts receivable, net Long-term asset Contract liability (current) Contract liability (long-term) Balance at January 1, 2020 $ 15,444 $ 1,977 $ 944 $ 2,153 Balance at December 31, 2020 18,894 4,984 941 3,626 Increase (decrease) $ 3,450 $ 3,007 $ (3) $ 1,473 As described above, the Company enters into royalty contracts that grant exclusive right, title, and interest in and to minerals. The transaction price consists of a variable sales-based royalty and, in certain arrangements, a fixed component in the form of an up-front lease bonus payment. The timing of the payment of the fixed portion of the transaction price is upfront, however, the performance obligation is satisfied over the primary term of the contract, which is generally five years. Therefore, at the time any such up-front payment is received, a contract liability is recorded which represents deferred revenue. The difference between the opening and closing balance of this contract liability, which is shown above, primarily results from the difference between new lease bonus payments received and amortization of up-front lease bonus payments received in previous periods. The amount of revenue recognized in both of the years ended December 31, 2020 and December 31, 2019 that was included in the opening contract liability was $0.9 million. This revenue consists of up-front lease bonus payments received under royalty contracts that are recognized over the primary term of the royalty contracts, which are generally five years. The Company expects to recognize $0.9 million in 2021, $3.1 million in 2022, $0.3 million in 2023, and $0.1 million in 2024 related to the contract liability remaining at December 31, 2020. The difference between the opening and closing balances of the Company’s contract balances results from the timing difference between the Company’s performance and the customer’s payment. The Company has no contract assets recognized from the costs to obtain or fulfill a contract with a customer.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories are summarized as follows: December 31 2020 2019 Coal $ 17,695 $ 15,700 Mining supplies 29,856 24,765 Total inventories $ 47,551 $ 40,465

Property, Plant and Equipment,

Property, Plant and Equipment, Net	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment, net includes the following: December 31 2020 2019 Coal lands and real estate $ 50,887 $ 54,647 Mineral interests 14,181 — Plant and equipment 231,190 190,868 Property, plant and equipment, at cost 296,258 245,515 Less allowances for depreciation, depletion and amortization 123,841 107,454 $ 172,417 $ 138,061

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets The Company has a coal supply agreement intangible asset which is subject to amortization based on units of production over the term of the lignite sales agreement which expires in 2032. The gross and net balances are set forth in the following table: Gross Carrying Accumulated Net Balance at December 31, 2020 Coal supply agreement $ 84,200 $ (48,870) $ 35,330 Balance at December 31, 2019 Coal supply agreement $ 84,200 $ (46,298) $ 37,902 Amortization expense for intangible assets was $2.6 million in both 2020 and 2019.

Asset Retirement Obligations

Asset Retirement Obligations	12 Months Ended
	Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Asset Retirement Obligations The Company’s obligations associated with the retirement of long-lived assets are recognized at fair value at the time the legal obligations are incurred. Upon initial recognition of a liability, a corresponding amount is capitalized as part of the carrying value of the related long-lived asset and is depreciated either by the straight-line method or the units-of-production method. The liability is accreted each period until the liability is settled, at which time the liability is removed. If the liability is settled for an amount other than the recorded amount, a gain or loss is recognized. The Company's asset retirement obligations are principally for costs to close its surface mines and reclaim the land it has disturbed as a result of its normal mining activities as well as for costs to dismantle certain mining equipment at the end of the life of the mine. Management’s estimate involves a high degree of subjectivity. In particular, the obligation’s fair value is determined using a discounted cash flow technique and is based upon mining permit requirements and various assumptions including credit adjusted risk-free-rates, estimates of disturbed acreage, life of the mine, estimated reclamation costs, the application of various environmental laws and regulation and assumptions regarding equipment productivity. The Company reviews its asset retirement obligations at each mine site at least annually and makes necessary adjustments for permit changes and for revisions of estimates of the timing and extent of reclamation activities and cost estimates. The accretion of the liability is being recognized over the estimated life of each individual asset retirement obligation and is recorded in the line “Cost of sales” in the accompanying Consolidated Statements of Operations. The associated asset is recorded in “Property, Plant and Equipment, net” in the accompanying Consolidated Balance Sheets. The depreciation of the asset is recorded in the line “Cost of sales” in the accompanying Consolidated Statements of Operations. A reconciliation of the Company's beginning and ending aggregate carrying amount of the asset retirement obligations are as follows: Coal Mining NAMining Unallocated Items NACCO Balance at January 1, 2019 $ 20,396 $ 485 $ 16,822 $ 37,703 Liabilities incurred during the period — 91 — 91 Liabilities settled during the period (8,265) — (752) (9,017) Accretion expense 1,260 28 1,323 2,611 Revision of estimated cash flows 5,624 — (153) 5,471 Balance at December 31, 2019 $ 19,015 $ 604 $ 17,240 $ 36,859 Liabilities incurred during the period 9,809 — — 9,809 Liabilities settled during the period (5,977) — (732) (6,709) Accretion expense 1,793 — 1,022 2,815 Revision of estimated cash flows 400 (604) (838) (1,042) Balance at December 31, 2020 $ 25,040 $ — $ 16,692 $ 41,732 Asset retirement obligations are incurred at the time development of a new mine or mine area commences. During 2020, MLMC began development of a new mine area and as such, recorded an additional $9.8 million asset retirement obligation and a corresponding $9.8 million asset was capitalized as a component of Property, plant and equipment, net. The asset retirement obligation’s fair value was determined using a discounted cash flow technique and is based upon permit requirements and various estimates and assumptions that would be used by market participants, including estimates of disturbed acreage, reclamation costs and assumptions regarding equipment productivity. Centennial Natural Resources (“Centennial”) ceased coal production at the end of 2015. During 2020, the Company transferred the mine permits for certain Centennial mines to an unrelated third party. As a result of the transfer of the mine permits, the Company was relieved of the associated mine reclamation obligations and therefore recorded a $4.8 million reduction to Centennial's asset retirement obligation, included in "Liabilities settled during the period" in the table above. As part of the transfer of the mine permits, the Company paid $3.8 million of cash, recorded $1.4 million in Other assets for amounts owed to Centennial from the third-party acquirer, and recognized $2.4 million in Other long-term liabilities in the Consolidated Balance Sheets. The liabilities are associated with amounts due to the third-party acquirer upon transfer or replacement of the surety bonds and the fair value of the obligation to stand ready to perform in the event there is a claim under the surety bonds. As of December 31, 2020, the Company has $5.8 million of surety bonds outstanding related to the mines associated with the transferred mine permits. The third party that acquired the mine permits is required as part of the transaction to transfer or replace the outstanding surety bonds as soon as it is able. If there is a claim under these surety bonds prior to the transfer or replacement of such bonds, the Company would be responsible to the surety company for any amounts it pays with respect to such claim, up to the amount of the outstanding surety bonds. During 2019, the Company transferred the mine permits for certain Centennial mines to an unrelated third party. As a result of these transfers, the Company was relieved of the associated mine reclamation obligations and recorded a $5.4 million reduction to Centennial's asset retirement obligation, included in "Liabilities settled during the current period" in the table above. As part of these transactions, the Company transferred a $3.4 million escrow account and paid $2.4 million of cash, resulting in a net loss on the transactions of $0.4 million recognized within cost of sales in the Consolidated Statement of Operations and reflected on the line “Revision of estimated cash flows” in the table above. The reduction to the asset retirement obligation related to these transfers was offset by a $2.0 million increase to the asset retirement obligation related to updated costs estimates for the remaining Centennial asset retirement obligations recognized within cost of sales in the Consolidated Statement of Operations and reflected on the line “Revision of estimated cash flows” in the table above. Due to updated cost estimates and changes in timing of the asset retirement obligation for MLMC, the Company recognized a $3.1 million increase to the asset retirement obligation in 2019 within cost of sales in the Consolidated Statement of Operations and reflected on the line “Revision of estimated cash flows” in the table above. Bellaire Corporation (“Bellaire”) is a non-operating subsidiary of the Company with legacy liabilities relating to closed mining operations, primarily former Eastern U.S. underground coal mining operations. These legacy liabilities include obligations for water treatment and other environmental remediation that arose as part of the normal course of closing these underground mining operations. The accretion of the liability is recognized over the estimated life of the asset retirement obligation and is recorded in the line “Closed mine obligations” in the accompanying Consolidated Statements of Operations. Since Bellaire's properties are no longer active operations, no associated asset has been capitalized.

Current and Long-Term Financing

Current and Long-Term Financing	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Current and Long-Term Financing	Current and Long-Term Financing Financing arrangements are obtained and maintained at the subsidiary level. NACCO has not guaranteed any borrowings of its subsidiaries. The following table summarizes the Company's available and outstanding borrowings: December 31 2020 2019 Total outstanding borrowings of NACoal: Revolving credit agreement $ 30,000 $ 16,000 Other debt 16,465 8,943 Total debt outstanding $ 46,465 $ 24,943 Current portion of borrowings outstanding $ 22,112 $ 7,795 Long-term portion of borrowings outstanding 24,353 17,148 $ 46,465 $ 24,943 Total available borrowings, net of limitations, under revolving credit agreement $ 146,951 $ 148,644 Unused revolving credit agreement $ 116,951 $ 132,644 Weighted average stated interest rate on total borrowings 2.3 % 5.1 % Annual maturities of total debt, excluding leases, are as follows: 2021 20,924 2022 10,956 2023 990 2024 1,025 2025 1,061 Thereafter 10,041 $ 44,997 Interest paid on total debt was $1.4 million and $0.9 million during 2020 and 2019, respectively. NACoal has an unsecured revolving line of credit of up to $150.0 million (the “NACoal Facility”) that expires in August 2022. Borrowings outstanding under the NACoal Facility were $30.0 million at December 31, 2020. At December 31, 2020, the excess availability under the NACoal Facility was $117.0 million, which reflects a reduction for outstanding letters of credit of $3.0 million. The NACoal Facility has performance-based pricing, which sets interest rates based upon NACoal achieving various levels of debt to EBITDA ratios, as defined in the NACoal Facility. Borrowings bear interest at a floating rate plus a margin based on the level of debt to EBITDA ratio achieved. The applicable margins, effective December 31, 2020, for base rate and LIBOR loans were 0.75% and 1.75%, respectively. The NACoal Facility has a commitment fee which is based upon achieving various levels of debt to EBITDA ratios. The commitment fee was 0.30% on the unused commitment at December 31, 2020. The weighted average interest rate applicable to the NACoal Facility at December 31, 2020 was 1.88% including the floating rate margin. The NACoal Facility contains restrictive covenants, which require, among other things, NACoal to maintain a maximum debt to EBITDA ratio of 3.00 to 1.00 and an interest coverage ratio of not less than 4.00 to 1.00. The NACoal Facility provides the ability to make loans, dividends and advances to NACCO, with some restrictions based on maintaining a maximum debt to EBITDA ratio of 2.00 to 1.00, or if greater than 2.00 to 1.00, a Fixed Charge Coverage Ratio of 1.10 to 1.00, in conjunction with maintaining unused availability thresholds of borrowing capacity, as defined in the NACoal Facility, of $15.0 million. At December 31, 2020, NACoal was in compliance with all financial covenants in the NACoal Facility. NACoal has a demand note payable to Coteau, one of the unconsolidated subsidiaries, which bears interest based on the applicable quarterly federal short-term interest rate as announced from time to time by the Internal Revenue Service. At December 31, 2020 and 2019, the balance of the note was $4.4 million and $2.0 million and the interest rate was 0.14% and 1.68%, respectively. NACoal has two notes payable that are secured by four specified units of equipment and bears interest at a weighted average rate of 4.20%. One note has a ten seven

Fair Value Disclosure

Fair Value Disclosure	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Disclosure	Fair Value Disclosure Recurring Fair Value Measurements : The following table presents the Company's assets accounted for at fair value on a recurring basis: Fair Value Measurements at Reporting Date Using Quoted Prices in Significant Active Markets for Significant Other Unobservable Identical Assets Observable Inputs Inputs Description December 31, 2020 (Level 1) (Level 2) (Level 3) Assets: Equity securities $ 13,164 $ 13,164 $ — $ — $ 13,164 $ 13,164 $ — $ — Fair Value Measurements at Reporting Date Using Quoted Prices in Significant Active Markets for Significant Other Unobservable Identical Assets Observable Inputs Inputs Description December 31, 2019 (Level 1) (Level 2) (Level 3) Assets: Equity securities $ 10,120 $ 10,120 $ — $ — $ 10,120 $ 10,120 $ — $ — Bellaire's Mine Water Treatment Trust invests in available for sale securities that are reported at fair value based upon quoted market prices in active markets for identical assets; therefore, they are classified as Level 1 within the fair value hierarchy. The Mine Water Treatment Trust realized a gain of $1.2 million and $1.5 million in the years ended December 31, 2020 and 2019, respectively. See Note 7 for further discussion of Bellaire's Mine Water Treatment Trust. During 2020, the Company invested $2.0 million in equity securities of a public company with a diversified portfolio of royalty producing mineral interests. The investment is reported at fair value based upon quoted market prices in active markets for identical assets; therefore, it is classified as Level 1 within the fair value hierarchy. The Company recognized a gain of $0.1 million during the year ended December 31, 2020, related to the investment in these equity securities. The gains related to equity securities are reported on the line Gain on equity securities in the "Other (income) expense" section of the Consolidated Statements of Operations. , There were no transfers into or out of Levels 1, 2 or 3 during the year ended December 31, 2020. Nonrecurring Fair Value Measurements: The Company regularly performs reviews of potential future development projects and identified certain undeveloped properties where market conditions related to any future development deteriorated during 2020. As a result, the Company estimated the fair value of the assets using unobservable inputs, which are classified as Level 3 inputs. The long-lived assets were written down to their estimated fair value, which resulted in a non-cash asset impairment charge of $7.3 million in the Minerals Management segment and $1.1 million in the Coal Mining segment for certain capitalized leasehold costs, prepaid royalties and other assets during 2020. The fair value of these long-lived assets was determined to be zero as such assets were deemed to have no future economic benefit based on the Company's analysis using market participant assumptions, and therefore no expected future cash flows. The impairment charges are reported on the line Asset impairment charges in the Consolidated Statements of Operations. Other Fair Value Measurement Disclosures: The carrying amounts of cash and cash equivalents, accounts receivable and accounts payable approximate fair value due to the short-term maturities of these instruments. The fair values of revolving credit agreements and long-term debt, excluding finance leases, were determined using current rates offered for similar obligations taking into account subsidiary credit risk, which is Level 2 as defined in the fair value hierarchy. The fair value and the book value of revolving credit agreements and long-term debt, excluding finance leases, was $45.2 million and $45.0 million, respectively, at December 31, 2020 and $24.3 million and $24.3 million, respectively, at December 31, 2019. Financial instruments that potentially subject the Company to concentration of credit risk consist principally of accounts receivable. Under its mining contracts, the Company recognizes revenue and a related receivable as coal or limestone is delivered. These mining contracts provide for monthly settlements. The Company's significant credit concentration is uncollateralized; however, historically minimal credit losses have been incurred. To further reduce credit risk associated with accounts receivable, the Company performs periodic credit evaluations of its customers, but does not generally require advance payments or collateral.

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases	Leases NACCO adopted ASU 2016-02, Leases (Topic 842), on January 1, 2019. The most significant effect to the Consolidated Balance Sheet relates to the recognition of new right-of-use assets (“ROU assets”) and lease liabilities for operating leases of real estate, mining and other equipment that expire at various dates through 2031. The majority of the Company's leases are operating leases. See the table below for further information on the Consolidated Balance Sheet. The Company's lease agreements do not contain lease payments that depend on an index or a rate, as such, minimum lease payments do not include variable lease payments. Leased assets and liabilities include the following: Description Location DECEMBER 31 DECEMBER 31 Assets Operating Operating lease right-of-use assets $ 10,324 $ 11,398 Finance Property, plant and equipment, net (a) 1,478 544 Liabilities Current Operating Other current liabilities $ 1,457 $ 1,318 Finance Current maturities of long-term debt 1,188 558 Noncurrent Operating Operating lease liabilities $ 11,196 $ 12,448 Finance Long-term debt 280 85 (a) Finance leased assets are recorded net of accumulated amortization of $0.2 million and $1.9 million as of December 31, 2020 and December 31, 2019, respectively. The components of lease expense for the years ended December 31 are as follows: Description Location 2020 2019 Lease expense Operating lease cost Selling, general and administrative expenses $ 2,103 $ 2,251 Finance lease cost: Amortization of leased assets Cost of sales 164 570 Interest on lease liabilities Interest expense 19 18 Variable lease expense Selling, general and administrative expenses 588 555 Short-term lease expense Selling, general and administrative expenses 260 298 Total lease expense $ 3,134 $ 3,692 Future minimum finance and operating lease payments were as follows at December 31, 2020: Finance Operating Total 2021 $ 1,229 $ 2,260 $ 3,489 2022 124 2,181 2,305 2023 102 1,705 1,807 2024 63 1,661 1,724 2025 7 1,469 1,476 Subsequent to 2025 — 7,952 7,952 Total minimum lease payments 1,525 17,228 $ 18,753 Amounts representing interest 57 4,575 Present value of net minimum lease payments $ 1,468 $ 12,653 As most of the Company's leases do not provide an implicit rate, the Company determines the incremental borrowing rate based on the information available at the lease commencement date in determining the present value of lease payments. The Company considers its credit rating and the current economic environment in determining this collateralized rate. The assumptions used in accounting for ASC 842 for the years ended December 31 are as follows: Lease term and discount rate 2020 2019 Weighted average remaining lease term (years) Operating 8.92 9.63 Finance 1.38 0.75 Weighted average discount rate Operating 7.00 % 6.99 % Finance 4.11 % 5.95 % The following table details cash paid for amounts included in the measurement of lease liabilities for the years ended December 31: Cash paid for amounts included in the measurement of lease liabilities 2020 2019 Operating cash flows from operating leases $ 2,223 $ 2,299 Operating cash flows from finance leases 19 18 Financing cash flows from finance leases 623 534
Leases	Leases NACCO adopted ASU 2016-02, Leases (Topic 842), on January 1, 2019. The most significant effect to the Consolidated Balance Sheet relates to the recognition of new right-of-use assets (“ROU assets”) and lease liabilities for operating leases of real estate, mining and other equipment that expire at various dates through 2031. The majority of the Company's leases are operating leases. See the table below for further information on the Consolidated Balance Sheet. The Company's lease agreements do not contain lease payments that depend on an index or a rate, as such, minimum lease payments do not include variable lease payments. Leased assets and liabilities include the following: Description Location DECEMBER 31 DECEMBER 31 Assets Operating Operating lease right-of-use assets $ 10,324 $ 11,398 Finance Property, plant and equipment, net (a) 1,478 544 Liabilities Current Operating Other current liabilities $ 1,457 $ 1,318 Finance Current maturities of long-term debt 1,188 558 Noncurrent Operating Operating lease liabilities $ 11,196 $ 12,448 Finance Long-term debt 280 85 (a) Finance leased assets are recorded net of accumulated amortization of $0.2 million and $1.9 million as of December 31, 2020 and December 31, 2019, respectively. The components of lease expense for the years ended December 31 are as follows: Description Location 2020 2019 Lease expense Operating lease cost Selling, general and administrative expenses $ 2,103 $ 2,251 Finance lease cost: Amortization of leased assets Cost of sales 164 570 Interest on lease liabilities Interest expense 19 18 Variable lease expense Selling, general and administrative expenses 588 555 Short-term lease expense Selling, general and administrative expenses 260 298 Total lease expense $ 3,134 $ 3,692 Future minimum finance and operating lease payments were as follows at December 31, 2020: Finance Operating Total 2021 $ 1,229 $ 2,260 $ 3,489 2022 124 2,181 2,305 2023 102 1,705 1,807 2024 63 1,661 1,724 2025 7 1,469 1,476 Subsequent to 2025 — 7,952 7,952 Total minimum lease payments 1,525 17,228 $ 18,753 Amounts representing interest 57 4,575 Present value of net minimum lease payments $ 1,468 $ 12,653 As most of the Company's leases do not provide an implicit rate, the Company determines the incremental borrowing rate based on the information available at the lease commencement date in determining the present value of lease payments. The Company considers its credit rating and the current economic environment in determining this collateralized rate. The assumptions used in accounting for ASC 842 for the years ended December 31 are as follows: Lease term and discount rate 2020 2019 Weighted average remaining lease term (years) Operating 8.92 9.63 Finance 1.38 0.75 Weighted average discount rate Operating 7.00 % 6.99 % Finance 4.11 % 5.95 % The following table details cash paid for amounts included in the measurement of lease liabilities for the years ended December 31: Cash paid for amounts included in the measurement of lease liabilities 2020 2019 Operating cash flows from operating leases $ 2,223 $ 2,299 Operating cash flows from finance leases 19 18 Financing cash flows from finance leases 623 534

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Various legal and regulatory proceedings and claims have been or may be asserted against NACCO and certain subsidiaries relating to the conduct of their businesses. These proceedings and claims are incidental to the ordinary course of business of the Company. Management believes that it has meritorious defenses and will vigorously defend the Company in these actions. Any costs that management estimates will be paid as a result of these claims are accrued when the liability is considered probable and the amount can be reasonably estimated.  If a range of amounts can be reasonably estimated and no amount within the range is a better estimate than any other amount, then the minimum of the range is accrued. The Company does not accrue liabilities when the likelihood that the liability has been incurred is probable but the amount cannot be reasonably estimated or when the liability is believed to be only reasonably possible or remote. For contingencies where an unfavorable outcome is probable or reasonably possible and which are material, the Company discloses the nature of the contingency and, in some circumstances, an estimate of the possible loss. These matters are subject to inherent uncertainties, and unfavorable rulings could occur. If an unfavorable ruling were to occur, there exists the possibility of an adverse impact on the Company’s financial position, results of operations and cash flows of the period in which the ruling occurs, or in future periods.

Stockholders' Equity and Earnin

Stockholders' Equity and Earnings Per Share	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Stockholders' Equity and Earnings Per Share	Stockholders' Equity and Earnings Per Share NACCO Industries, Inc. Class A common stock is traded on the New York Stock Exchange under the ticker symbol “NC.” Because of transfer restrictions on Class B common stock, no trading market has developed, or is expected to develop, for the Company's Class B common stock. The Class B common stock is convertible into Class A common stock on a one-for-one basis at any time at the request of the holder. The Company's Class A common stock and Class B common stock have the same cash dividend rights per share. As the liquidation and dividend rights are identical, any distribution of earnings would be allocated to Class A and Class B stockholders on a proportionate basis, and accordingly the net income per share for each class of common stock is identical. The Class A common stock has one vote per share and the Class B common stock has ten votes per share. The total number of authorized shares of Class A common stock and Class B common stock at December 31, 2020 was 25,000,000 shares and 6,756,176 shares, respectively. Treasury shares of Class A common stock totaling 2,726,017 and 2,817,714 at December 31, 2020 and 2019, respectively, have been deducted from shares outstanding. Stock Repurchase Programs: On November 6, 2019, the Company's Board of Directors approved a stock purchase program ("2019 Stock Repurchase Program") providing for the purchase of up to $25 million of the Company’s outstanding Class A common stock through December 31, 2021. NACCO’s previous repurchase program ("2018 Stock Repurchase Program") would have expired on December 31, 2019 but was terminated and replaced by the 2019 Stock Repurchase Program. As a result of the uncertainty surrounding the COVID-19 pandemic, the Company suspended repurchasing shares under the 2019 Stock Repurchase Program in March 2020. Prior to the decision to cease share repurchases, the Company repurchased 32,286 shares of Class A common stock under the 2019 Stock Repurchase Program for an aggregate purchase price of $1.0 million during 2020. The Company repurchased 28,094 and 44,476 shares of Class A common stock under the 2019 Stock Repurchase Program and 2018 Stock Repurchase Program, respectively, for an aggregate purchase price of $3.0 million during 2019. The timing and amount of any repurchases under the 2019 Stock Repurchase Program are determined at the discretion of the Company's management based on a number of factors, including the availability of capital, other capital allocation alternatives, market conditions for the Company's Class A common stock and other legal and contractual restrictions. The 2019 Stock Repurchase Program does not require the Company to acquire any specific number of shares and may be modified, suspended, extended or terminated by the Company without prior notice and may be executed through open market purchases, privately negotiated transactions or otherwise. All or part of the repurchases under the 2019 Stock Repurchase Program may be implemented under a Rule 10b5-1 trading plan, which would allow repurchases under pre-set terms at times when the Company might otherwise be restricted from doing so under applicable securities laws. Stock Compensation: See Note 2 for a discussion of the Company's restricted stock awards. Earnings per Share: The weighted average number of shares of Class A common stock and Class B common stock outstanding used to calculate basic and diluted earnings per share were as follows: 2020 2019 Basic weighted average shares outstanding 7,026 6,974 Dilutive effect of restricted stock awards 31 33 Diluted weighted average shares outstanding 7,057 7,007 Basic earnings per share $ 2.11 $ 5.68 Diluted earnings per share $ 2.10 $ 5.66

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company provides for income taxes and the related accounts under the asset and liability method. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities using enacted tax rates expected to be in effect during the year in which the basis differences reverse. Valuation allowances are established when management determines it is more likely than not that some portion, or all, of the deferred tax assets will not be realized. The components of income (loss) before income tax provision (benefit) and the income tax provision (benefit) for the years ended December 31 are as follows: 2020 2019 Income (loss) before income tax provision (benefit) Domestic $ 13,990 $ 40,742 Foreign 268 2,657 $ 14,258 $ 43,399 Income tax provision (benefit) Current income tax provision (benefit): Federal $ (7,859) $ (6,473) State (408) 939 Foreign 215 603 Total current (8,052) (4,931) Deferred income tax provision: Federal 7,847 8,125 State (330) 573 Total deferred 7,517 8,698 $ (535) $ 3,767 The Company made income tax payments of $0.4 million and $1.0 million during 2020 and 2019, respectively. During the same periods, income tax refunds totaled $4.2 million and $2.6 million, respectively. The provision for income taxes differs from the amount computed by applying the statutory federal income tax rate to income before the provision for income taxes. A reconciliation of the federal statutory and effective income tax rate for the years ended December 31 is as follows: 2020 2019 Income before income tax provision $ 14,258 $ 43,399 Statutory taxes at 21.0% $ 2,994 $ 9,114 State and local income taxes (626) 1,129 Non-deductible expenses 426 736 Percentage depletion (3,744) (4,451) R&D and other federal credits (367) (255) Settlements and uncertain tax positions 6,286 (2,377) Coronavirus Aid, Relief, and Economic Security ("CARES") Act - carryback rate differential (4,741) — Other, net (763) (129) Income tax provision $ (535) $ 3,767 Effective income tax rate (3.8) % 8.7 % The Company recorded an income tax benefit of $0.5 million for the year ended December 31, 2020 on income before income tax of $14.3 million, or (3.8%), compared to income tax expense of $3.8 million on income before income tax of $43.4 million, or 8.7%, for the year ended December 31, 2019. The year ended December 31, 2020 includes $7.3 million of discrete tax charges primarily related to settlement of tax examinations, reserves for uncertain tax positions and return to provision adjustments partially offset by a benefit of $4.7 million, primarily due to the rate differential related to carrying back losses under the provisions of the CARES Act. The CARES Act allows net operating tax losses incurred in 2018, 2019, and 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid income taxes. The Company generated a net tax operating loss in 2020 primarily due to the realization of certain deferred tax assets. Discrete tax items in the year ended December 31, 2019 were a benefit of $2.5 million primarily resulting from changes in prior year estimates and the effective settlement of certain discrete tax items from on-going examinations. The Company’s effective income tax rate, excluding the CARES Act and discrete items, was (22.0%) and 14.5% for the years ended December 31, 2020 and 2019, respectively. The effective income tax rate differs from the U.S. federal statutory rate primarily due to the benefit from percentage depletion. The benefit of percentage depletion is not directly related to the amount of pre-tax income recorded in a period. Accordingly, as a result of the $29.1 million reduction in income before income tax in 2020 compared to 2019, the proportional effect of the benefit from percentage depletion on the effective income tax rate in 2020 resulted in a significantly lower effective tax rate in 2020 compared to 2019. A detailed summary of the total deferred tax assets and liabilities in the Company's Consolidated Balance Sheets resulting from differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company’s deferred tax assets and liabilities are as follows: December 31 2020 2019 Deferred tax assets Lease liabilities $ 27,800 $ 30,875 Tax carryforwards 17,756 16,305 Inventories 3,742 1,704 Accrued liabilities 10,160 10,020 Employee benefits 2,747 4,853 Land valuation adjustment 5,536 4,304 Other 5,401 4,701 Total deferred tax assets 73,142 72,762 Less: Valuation allowance 11,549 12,296 61,593 60,466 Deferred tax liabilities Lease right-of-use assets 27,800 30,875 Depreciation and depletion 31,972 28,061 Partnership investment - development costs 11,686 9,949 Accrued pension benefits 7,685 3,919 Total deferred tax liabilities 79,143 72,804 Net deferred liability $ (17,550) $ (12,338) The following table summarizes the tax carryforwards and associated carryforward periods and related valuation allowances where the Company has determined that realization is uncertain: December 31, 2020 Net deferred tax Valuation Carryforwards State net operating loss $ 18,708 $ 14,478 2021-2040 Federal research credit 2,648 — 2034-2040 Total $ 21,356 $ 14,478 December 31, 2019 Net deferred tax Valuation Carryforwards State net operating loss $ 16,531 $ 13,668 2020-2039 Federal research credit 1,455 — 2034-2038 Federal foreign tax credit 463 463 2029 Alternative minimum tax ("AMT") credit 1,596 — (1) Total $ 20,045 $ 14,131 (1) The Tax Cuts and Jobs Act provided that AMT credits can be utilized to offset income taxes owed in tax years 2018 through 2020 with any remaining AMT credit refundable in 2021. The CARES Act revised this to allow AMT credits to be refundable in 2018 and 2019. The Company has reclassified its AMT credits to the current receivable as of December 31, 2020. The Company has a valuation allowance for certain state and foreign deferred tax assets. Based upon the review of historical earnings and the relevant expiration of carryforwards, including utilization limitations in the various state taxing jurisdictions, the Company believes the valuation allowances are appropriate and does not expect to release valuation allowances within the next twelve months that would have a significant effect on the Company's financial position or results of operations. The tax returns of the Company and certain of its subsidiaries are under routine examination by various taxing authorities. The Company has not been informed of any material assessment for which an accrual has not been previously provided and the Company would vigorously contest any material assessment. Management believes any potential adjustment would not materially affect the Company's financial condition or results of operations. In general, the Company operates in taxing jurisdictions that provide a statute of limitations period ranging from three to five years for the taxing authorities to review the applicable tax filings. The examination of the 2013-2016 U.S. federal tax returns is ongoing. The Company has extended the statute of limitations to allow the U.S. taxing authorities to complete their examination. The following is a reconciliation of the Company's total gross unrecognized tax benefits, defined as the aggregate tax effect of differences between tax return positions and the benefits recognized in the financial statements for the years ended December 31, 2020 and 2019. The increase in the gross unrecognized tax benefits in 2020 is primarily due to tax positions related to worthlessness losses for which the timing of deductibility is uncertain. Approximately $6.3 million and $2.3 million of the gross unrecognized tax benefits as of December 31, 2020 and 2019, respectively, relate to permanent items that, if recognized, would impact the effective income tax rate. This amount differs from the gross unrecognized tax benefits presented in the table below due to (1) the deferred tax asset which would be available if the position were not sustained upon audit and (2) the decrease in U.S. federal income taxes which would occur upon the recognition of the state tax benefits included herein. 2020 2019 Balance at January 1 $ 2,860 $ 1,280 Additions based on tax positions related to prior years 2,774 1,172 Decreases based on settlements with tax authorities (803) — Additions based on tax positions related to the current year 5,628 408 Balance at December 31 $ 10,459 $ 2,860 The Company records interest and penalties on uncertain tax positions as a component of the income tax provision. The Company recognized net benefit of less than $0.1 million and net expense of less than $0.1 million in interest and penalties related to uncertain tax positions during 2020 and 2019, respectively. The total amount of interest and penalties accrued was $0.1 million as of December 31, 2020 and 2019, respectively.

Retirement Benefit Plans

Retirement Benefit Plans	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Retirement Benefit Plans	Retirement Benefit Plans Defined Benefit Plans: The Company maintains defined benefit pension plans that provide benefits based on years of service and average compensation during certain periods. Prior to 2020, the Company amended the Combined Defined Benefit Plan for NACCO Industries, Inc. and its subsidiaries (the “Combined Plan”) to freeze pension benefits for all employees. The Company also amended the Supplemental Retirement Benefit Plan (the “SERP”) to freeze all pension benefits. All eligible employees of the Company, including employees whose pension benefits are frozen, receive retirement benefits under defined contribution retirement plans. During the year ended December 31, 2019, the Company offered lump-sum settlements to certain Combined Plan participants. These lump sum payments resulted in a pension settlement charge of $0.9 million. The assumptions used in accounting for the defined benefit plans were as follows for the years ended December 31: 2020 2019 Weighted average discount rates for pension benefit obligation 2.02% - 2.36% 2.98% - 3.20% Weighted average discount rates for net periodic benefit cost 2.98% - 3.20% 4.10% - 4.20% Expected long-term rate of return on assets for net periodic benefit cost 7.00 % 7.50 % Set forth below is a detail of the net periodic pension (income) expense for the defined benefit plans for the years ended December 31: 2020 2019 Interest cost $ 1,285 $ 1,710 Expected return on plan assets (2,435) (2,778) Amortization of actuarial loss 597 422 Amortization of prior service cost 58 58 Settlements — 873 Net periodic pension (income) expense $ (495) $ 285 Set forth below is detail of other changes in plan assets and benefit obligations recognized in other comprehensive loss (income) for the years ended December 31: 2020 2019 Current year actuarial loss (gain) $ 667 $ (1,030) Amortization of actuarial loss (597) (422) Amortization of prior service cost (58) (58) Settlements — (873) Total recognized in other comprehensive loss (income) $ 12 $ (2,383) The following table sets forth the changes in the benefit obligation and the plan assets during the year and the funded status of the defined benefit plans at December 31: 2020 2019 Change in benefit obligation Projected benefit obligation at beginning of year $ 41,854 $ 42,026 Interest cost 1,285 1,710 Actuarial loss 3,996 3,121 Benefits paid (2,535) (2,391) Settlements — (2,612) Projected benefit obligation at end of year $ 44,600 $ 41,854 Accumulated benefit obligation at end of year $ 44,600 $ 41,854 Change in plan assets Fair value of plan assets at beginning of year $ 37,364 $ 34,954 Actual return on plan assets 5,763 6,930 Employer contributions 507 483 Benefits paid (2,535) (2,391) Settlements — (2,612) Fair value of plan assets at end of year $ 41,099 $ 37,364 Funded status at end of year $ (3,501) $ (4,490) Amounts recognized in the balance sheets consist of: Non-current assets $ 4,070 $ 3,079 Current liabilities (549) (606) Non-current liabilities (7,022) (6,963) $ (3,501) $ (4,490) Components of accumulated other comprehensive loss (income) consist of: Actuarial loss $ 14,022 $ 13,951 Prior service cost 761 819 Deferred taxes (3,316) (3,305) $ 11,467 $ 11,465 The Company recognizes as a component of benefit (income) cost, as of the measurement date, any unrecognized actuarial net gains or losses that exceed 10% of the larger of the projected benefit obligations or the plan assets, defined as the "corridor." Amounts outside the corridor are amortized over the average expected remaining service of active participants expected to benefit under the retiree medical plans or over the average expected remaining lifetime of inactive participants for the pension plans. The (gain) loss amounts recognized in AOCI are not expected to be fully recognized until the plan is terminated or as settlements occur, which would trigger accelerated recognition. Prior service costs resulting from plan changes are also in AOCI. The Company's policy is to make contributions to fund its pension plans within the range allowed by applicable regulations. The Company maintains one supplemental defined benefit plan that pays monthly benefits to participants directly out of corporate funds. All other pension benefit payments are made from assets of the pension plans. Future pension benefit payments expected to be paid from assets of the pension plans are: 2021 $ 2,631 2022 2,600 2023 2,676 2024 2,695 2025 2,666 2026 - 2030 12,866 $ 26,134 The expected long-term rate of return on defined benefit plan assets reflects management's expectations of long-term rates of return on funds invested to provide for benefits included in the projected benefit obligations. In establishing the expected long-term rate of return assumption for plan assets, the Company considers the historical rates of return over a period of time that is consistent with the long-term nature of the underlying obligations of these plans as well as a forward-looking rate of return. The historical and forward-looking rates of return for each of the asset classes used to determine the Company's estimated rate of return assumption were based upon the rates of return earned or expected to be earned by investments in the equivalent benchmark market indices for each of the asset classes. Expected returns for pension plans are based on a calculated market-related value for pension plan assets. Under this methodology, asset gains and losses resulting from actual returns that differ from the Company's expected returns are recognized in the market-related value of assets ratably over three years. The pension plans maintain investment policies that, among other things, establish a portfolio asset allocation methodology with percentage allocation bands for individual asset classes. The investment policies provide that investments are reallocated between asset classes as balances exceed or fall below the appropriate allocation bands. The following is the actual allocation percentage and target allocation percentage for the pension plan assets at December 31: 2020 2019 Target Allocation U.S. equity securities 45.4 % 45.1 % 36.0% - 54.0% Non-U.S. equity securities 20.3 % 20.0 % 16.0% - 24.0% Fixed income securities 33.9 % 34.4 % 30.0% - 40.0% Money market 0.4 % 0.5 % 0.0% - 10.0% The defined benefit pension plans do not have any direct ownership of NACCO common stock. The fair value of each major category of the Company's pension plan assets are valued using quoted market prices in active markets for identical assets, or Level 1 in the fair value hierarchy. Following are the values as of December 31: Level 1 2020 2019 U.S. equity securities $ 18,640 $ 16,862 Non-U.S. equity securities 8,335 7,482 Fixed income securities 13,948 12,854 Money market 176 166 Total $ 41,099 $ 37,364 Postretirement Health Care: The Company also maintains health care plans which provide benefits to grandfathered eligible retired employees. All health care plans of the Company have a cap on the Company's share of the costs. The health care plans were amended effective January 1, 2019 to eliminate the open network structure. The move to network provided benefits will result in cost savings for the Company. These plans have no assets. Under the Company's current policy, plan benefits are funded at the time they are due to participants. The assumptions used in accounting for the postretirement health care plans are set forth below for the years ended December 31: 2020 2019 Weighted average discount rates for benefit obligation 1.37 % 2.65 % Weighted average discount rates for net periodic benefit cost 1.37% - 2.65% 3.80 % Health care cost trend rate assumed for next year 6.25 % 6.50 % Rate to which the cost trend rate is assumed to decline (ultimate trend rate) 5.0 % 5.0 % Year that the rate reaches the ultimate trend rate 2027 2025 Set forth below is a detail of the net periodic benefit (income) expense for the postretirement health care plans for the years ended December 31: 2020 2019 Service cost $ 21 $ 24 Interest cost 52 77 Amortization of actuarial (gain) loss (1) 8 Amortization of prior service credit (59) (80) Amortization of curtailment (31) — Net periodic benefit (income) expense $ (18) $ 29 Set forth below is a detail of other changes in plan assets and benefit obligations recognized in other comprehensive income for the years ended December 31: 2020 2019 Current year actuarial loss $ 194 $ 46 Amortization of actuarial gain (loss) 1 (8) Amortization of prior service credit 59 80 Amortization of curtailment 31 — Transfers 46 — Total recognized in other comprehensive income $ 331 $ 118 The following sets forth the changes in benefit obligations during the year and the funded status of the postretirement health care at December 31: 2020 2019 Change in benefit obligation Benefit obligation at beginning of year $ 2,049 $ 2,113 Service cost 21 24 Interest cost 52 77 Plan amendments 49 — Actuarial loss 145 46 Benefits paid (262) (211) Benefit obligation at end of year $ 2,054 $ 2,049 Funded status at end of year $ (2,054) $ (2,049) Amounts recognized in the balance sheets consist of: Current liabilities $ (238) $ (204) Noncurrent liabilities (1,816) (1,845) $ (2,054) $ (2,049) Components of accumulated other comprehensive loss (income) consist of: Actuarial loss $ 466 $ 227 Prior service credit (167) (259) Deferred taxes (167) (96) $ 132 $ (128) Future postretirement health care benefit payments expected to be paid are: 2021 239 2022 226 2023 211 2024 196 2025 171 2026 - 2030 688 $ 1,731

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Business Segments	Business Segments The Company’s operating segments are: (i) Coal Mining, (ii) NAMining and (iii) Minerals Management. The Company determines its reportable segments by first identifying its operating segments, and then by assessing whether any components of these segments constitute a business for which discrete financial information is available and where segment management regularly reviews the operating results of that component. The Company’s Chief Operating Decision Maker utilizes operating profit to evaluate segment performance and allocate resources. The Company has items not directly attributable to a reportable segment which are not included as part of the measurement of segment operating profit, which are primarily administrative costs related to public company reporting requirements at the parent company and the financial results of Mitigation Resources of North America ® (“MRNA”) and Bellaire. MRNA generates and sells stream and wetland mitigation credits (known as mitigation banking) and provides services to those engaged in permittee-responsible stream and wetland mitigation. Bellaire manages the Company’s long-term liabilities related to former Eastern U.S. underground mining activities. As of January 1, 2020, the Company retrospectively changed its computation of segment operating profit to reclassify certain expenses, primarily related to executive and board compensation. These expenses are now included in unallocated items. The change in segment reporting reflected a decision to evaluate the financial performance of the Company’s segments excluding executive and board compensation. All prior period segment information has been reclassified to conform to the new presentation. This segment reporting change has no impact on consolidated operating results. All financial statement line items below operating profit (other income including interest expense and interest income, the provision for income taxes and net income) are presented and discussed within this Form 10-K on a consolidated basis. Included within other income on the line Income from other unconsolidated affiliates within the Consolidated Statements of Operations is the financial results of NoDak Energy Services, LLC ("NoDak"). NoDak operated and maintained a coal drying system at a customer’s power plant. The NoDak contract expired in the first quarter of 2020. See Note 1 for additional discussion of the Company's reportable segments. All current operations reside in the U.S. The accounting policies of the reportable segments are described in Note 2. In 2020, two customers individually accounted for more than 10% of consolidated revenue. In 2019, two customers and an oil and gas lessee individually accounted for more than 10% of consolidated revenue. The following represents the revenue attributable to each of these entities as a percentage of consolidated revenue for those years: Percentage of Consolidated Revenue Segment 2020 2019 Coal Mining customer 55 % 48 % NAMining customer 19 % 21 % Minerals Management lessee less than 10% 12 % In addition, for the year ended December 31, 2020, the Coal Mining segment derived approximately 60% of the Earnings of Unconsolidated Operations from two customers, Basin Electric and GRE. GRE announced its intent to close Coal Creek station in 2022. The following tables present revenue, operating profit, depreciation expense and capital expenditures for the years ended December 31: 2020 2019 Revenues Coal Mining $ 72,088 $ 68,701 NAMining 42,392 42,823 Minerals Management 14,721 30,119 Unallocated Items 2,133 790 Eliminations (2,902) (1,443) Total $ 128,432 $ 140,990 Operating profit (loss) Coal Mining $ 25,436 $ 34,120 NAMining 1,872 (564) Minerals Management 3,493 25,721 Unallocated Items (17,256) (20,713) Eliminations (97) 256 Total $ 13,448 $ 38,820 Expenditures for property, plant and equipment and acquisition of mineral interests Coal Mining $ 14,825 $ 15,092 NAMining 13,862 8,824 Minerals Management 15,474 517 Unallocated Items 207 231 Total $ 44,368 $ 24,664 Depreciation, depletion and amortization Coal Mining $ 14,213 $ 12,409 NAMining 2,470 2,223 Minerals Management 1,308 1,362 Unallocated Items 123 246 Total $ 18,114 $ 16,240 Asset information by segment is not discretely maintained for internal reporting or used in evaluating performance.

Parent Company Condensed Balanc

Parent Company Condensed Balance Sheets	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Parent Company Condensed Balance Sheets	Parent Company Condensed Balance Sheets The condensed balance sheets of NACCO, the parent company, at December 31 are as follows: 2020 2019 ASSETS Cash and cash equivalents $ 85,365 $ 120,016 Accounts receivable from affiliates 495 515 Current intercompany accounts receivable, net — 1,255 Other current assets 20,648 10,448 Investment in subsidiaries 211,468 189,338 Property, plant and equipment, net 110 167 Other non-current assets 5,890 4,570 Total Assets $ 323,976 $ 326,309 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities $ 3,242 $ 5,257 Current intercompany accounts payable, net 2,337 — Current portion of deferred compensation — 13,465 Note payable to Bellaire 16,750 16,950 Other non-current liabilities 1,023 1,245 Stockholders’ equity 300,624 289,392 Total Liabilities and Stockholders’ Equity $ 323,976 $ 326,309 The credit agreement at NACoal allows for the transfer of assets to NACCO under certain circumstances. The amount of NACCO's investment that was restricted at December 31, 2020 totaled approximately $1.7 million. The amount of unrestricted cash available to NACCO included in “Investment in subsidiaries” was $0.7 million at December 31, 2020. Dividends and management fees from its subsidiaries are the primary sources of cash for NACCO. SCHEDULE I—CONDENSED FINANCIAL INFORMATION OF THE PARENT NACCO INDUSTRIES, INC. AND SUBSIDIARIES PARENT COMPANY CONDENSED BALANCE SHEETS December 31 2020 2019 (In thousands) ASSETS Cash and cash equivalents $ 85,365 $ 120,016 Accounts receivable from affiliates 495 515 Current intercompany accounts receivable, net — 1,255 Other current assets 20,648 10,448 Investment in subsidiaries 211,468 189,338 Property, plant and equipment, net 110 167 Other non-current assets 5,890 4,570 Total Assets $ 323,976 $ 326,309 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities $ 3,242 $ 5,257 Current intercompany accounts payable, net 2,337 — Current portion of deferred compensation — 13,465 Note payable to Bellaire 16,750 16,950 Other non-current liabilities 1,023 1,245 Stockholders’ equity 300,624 289,392 Total Liabilities and Stockholders’ Equity $ 323,976 $ 326,309 See Notes to Parent Company Condensed Financial Statements. SCHEDULE I—CONDENSED FINANCIAL INFORMATION OF THE PARENT NACCO INDUSTRIES, INC. AND SUBSIDIARIES PARENT COMPANY CONDENSED STATEMENTS OF COMPREHENSIVE INCOME Year Ended December 31 2020 2019 (In thousands) Expense (income): Intercompany interest expense $ 1,178 $ 1,190 Other, net (1,003) (1,796) 175 (606) Administrative and general expenses 5,658 6,403 Loss before income taxes (5,833) (5,797) Income tax provision (benefit) 2,419 (3,819) Net loss before equity in earnings of subsidiaries (8,252) (1,978) Equity in earnings of subsidiaries 23,045 41,610 Net income 14,793 39,632 Current period pension and postretirement plan adjustment, net of $213 tax benefit and $226 tax expense in 2020 and 2019, respectively (697) 758 Pension settlement, net of $202 tax benefit in 2019 — 671 Reclassification of pension and postretirement adjustments into earnings, net of $129 and $90 tax benefit in 2020 and 2019, respectively 435 845 Total other comprehensive income (262) 2,274 Comprehensive Income $ 14,531 $ 41,906 See Notes to Parent Company Condensed Financial Statements. SCHEDULE I—CONDENSED FINANCIAL INFORMATION OF THE PARENT NACCO INDUSTRIES, INC. AND SUBSIDIARIES PARENT COMPANY CONDENSED STATEMENTS OF CASH FLOWS Year Ended December 31 2020 2019 (In thousands) Operating Activities Net income $ 14,793 $ 39,632 Equity in earnings of subsidiaries 23,045 41,610 Parent company only net loss (8,252) (1,978) Net changes related to operating activities (22,822) 3,671 Net cash (used for) provided by operating activities (31,074) 1,693 Investing Activities Expenditures for property, plant and equipment — — Net cash used for investing activities — — Financing Activities Dividends received from subsidiaries 3,000 42,000 Notes payable to Bellaire (200) (350) Purchase of treasury shares (1,002) (3,010) Cash dividends paid (5,375) (5,132) Other — (4) Net cash (used for) provided by financing activities (3,577) 33,504 Cash and cash equivalents Increase (decrease) for the period (34,651) 35,197 Balance at the beginning of the period 120,016 84,819 Balance at the end of the period $ 85,365 $ 120,016 See Notes to Parent Company Condensed Financial Statements. SCHEDULE I—CONDENSED FINANCIAL INFORMATION OF THE PARENT NACCO INDUSTRIES, INC. AND SUBSIDIARIES NOTES TO PARENT COMPANY CONDENSED FINANCIAL STATEMENTS FOR THE YEAR ENDED DECEMBER 31, 2020 AND 2019 The notes to Consolidated Financial Statements, incorporated in Item 15 of this Form 10-K, are hereby incorporated by reference into these Notes to Parent Company Condensed Financial Statements. NOTE A — ACCOUNTING POLICIES NACCO Industries, Inc. ® (“NACCO” or the “parent company”) is the public holding company for The North American Coal Corporation ® ("NACoal"). In the Parent Company Condensed Financial Statements, NACCO's investment in subsidiaries is stated at cost plus equity in undistributed earnings of subsidiaries since the date of acquisition. NACCO's share of net income of unconsolidated subsidiaries is included in net income using the equity method. Parent Company financial statements should be read in conjunction with the Company's consolidated financial statements. NOTE B — LONG-TERM OBLIGATIONS AND GUARANTEES It is NACCO's policy not to guarantee the debt of NACoal. NOTE C — UNRESTRICTED CASH The amount of unrestricted cash available to NACCO, included in Investment in subsidiaries, was $0.7 million at December 31, 2020 and was in addition to the $85.4 million of cash included in the Parent Company Condensed Balance Sheet at December 31, 2020.

Unconsolidated Subsidiaries

Unconsolidated Subsidiaries	12 Months Ended
	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Unconsolidated Subsidiaries	Unconsolidated Subsidiaries Each of the Company's wholly owned Unconsolidated Subsidiaries, within the Coal Mining and NAMining segments, meet the definition of a VIE. The Unconsolidated Subsidiaries are capitalized primarily with debt financing provided by or supported by their respective customers, and generally without recourse to NACCO and NACoal. Although NACoal owns 100% of the equity and manages the daily operations of the Unconsolidated Subsidiaries, the Company has determined that the equity capital provided by NACoal is not sufficient to adequately finance the ongoing activities or absorb any expected losses without additional support from the customers. The customers have a controlling financial interest and have the power to direct the activities that most significantly affect the economic performance of the entities. As a result, the Company is not the primary beneficiary and therefore does not consolidate these entities' financial positions or results of operations. See Note 1 for a discussion of these entities. The investment in the unconsolidated subsidiaries and related tax positions totaled $29.0 million and $24.6 million at December 31, 2020 and 2019, respectively. The Company's risk of loss relating to these entities is limited to its invested capital, which was $6.5 million and $5.0 million at December 31, 2020 and 2019, respectively. NACoal is a party to certain guarantees related to Coyote Creek. Under certain circumstances of default or termination of Coyote Creek’s Lignite Sales Agreement (“LSA”), NACoal would be obligated for payment of a "make-whole" amount to Coyote Creek’s third-party lenders. The “make-whole” amount is based on the excess, if any, of the discounted value of the remaining scheduled debt payments over the principal amount. In addition, in the event Coyote Creek’s LSA is terminated on or after January 1, 2024 by Coyote Creek’s customers, NACoal is obligated to purchase Coyote Creek’s dragline and rolling stock for the then net book value of those assets. To date, no payments have been required from NACoal since the inception of these guarantees. The Company believes that the likelihood NACoal would be required to perform under the guarantees is remote, and no amounts related to these guarantees have been recorded. Summarized financial information for the unconsolidated subsidiaries is as follows: 2020 2019 Statement of Operations Revenue $ 768,660 $ 734,515 Gross profit $ 69,021 $ 72,433 Income before income taxes $ 60,398 $ 65,183 Net income $ 50,933 $ 54,067 Balance Sheet Current assets $ 186,934 $ 183,848 Non-current assets $ 959,032 $ 837,477 Current liabilities $ 143,843 $ 141,132 Non-current liabilities $ 995,658 $ 875,216 Revenue includes all mine operating costs that are reimbursed by the customers of the Unconsolidated Subsidiaries as well as the compensation per ton of coal, heating unit (MMBtu) or ton of limestone delivered. Reimbursed costs have offsetting expenses and have no impact on income before income taxes. Income before income taxes represents the Earnings of the unconsolidated operations and the Income from other unconsolidated affiliates. NACoal received dividends of $49.7 million and $53.5 million from the Unconsolidated Subsidiaries in 2020 and 2019, respectively.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions One of the Company's directors is a retired Jones Day partner. Legal services rendered by Jones Day approximated $1.0 million for both of the years ended December 31, 2020 and 2019. Alfred M. Rankin, Jr. retired as the President and Chief Executive Officer of NACCO effective during 2017. Mr. Rankin continues to serve as the Chairman of the Board of Directors of NACCO and Mr. Rankin supports the President and Chief Executive Officer of NACCO upon request under the terms of a consulting agreement. Fees for consulting services rendered by Mr. Rankin approximated $0.5 million for both of the years ended December 31, 2020 and 2019. Hyster-Yale Materials Handling, Inc. ("Hyster-Yale") is a former subsidiary of the Company that was spun-off to stockholders in 2012. Mr. Rankin is Chairman, President and Chief Executive Officer of Hyster-Yale Materials Handling and Chairman, Hyster-Yale Group. In the ordinary course of business, NACoal leases or buys Hyster-Yale lift trucks. The terms may not be comparable to terms that would be obtained in a transaction between unaffiliated parties.

Other Events and Transactions

Other Events and Transactions	12 Months Ended
	Dec. 31, 2020
Other Events And Transactions [Abstract]
Other Events and Transactions	Other Events and TransactionsVoluntary Separation Program: During the fourth quarter of 2020, the Company adopted a voluntary separation program ("2020 VSP") for eligible employees who met certain age and service requirements in an effort to reduce overall headcount at the Company’s headquarters. The irrevocable acceptance period for associates electing to participate in the 2020 VSP ended during December 2020. In the fourth quarter of 2020, the Company recorded pre-tax charges for the 2020 VSP of $1.8 million included in Selling, general and administrative expense in the accompanying Consolidated Statements of Operations. As of December 31, 2020, $1.6 million was unpaid and recorded in Accrued payroll in the Consolidated Balance Sheet.

Schedule I - Condensed Financia

Schedule I - Condensed Financial Information of the Parent	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Schedule I - Condensed Financial Information of the Parent	Parent Company Condensed Balance Sheets The condensed balance sheets of NACCO, the parent company, at December 31 are as follows: 2020 2019 ASSETS Cash and cash equivalents $ 85,365 $ 120,016 Accounts receivable from affiliates 495 515 Current intercompany accounts receivable, net — 1,255 Other current assets 20,648 10,448 Investment in subsidiaries 211,468 189,338 Property, plant and equipment, net 110 167 Other non-current assets 5,890 4,570 Total Assets $ 323,976 $ 326,309 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities $ 3,242 $ 5,257 Current intercompany accounts payable, net 2,337 — Current portion of deferred compensation — 13,465 Note payable to Bellaire 16,750 16,950 Other non-current liabilities 1,023 1,245 Stockholders’ equity 300,624 289,392 Total Liabilities and Stockholders’ Equity $ 323,976 $ 326,309 The credit agreement at NACoal allows for the transfer of assets to NACCO under certain circumstances. The amount of NACCO's investment that was restricted at December 31, 2020 totaled approximately $1.7 million. The amount of unrestricted cash available to NACCO included in “Investment in subsidiaries” was $0.7 million at December 31, 2020. Dividends and management fees from its subsidiaries are the primary sources of cash for NACCO. SCHEDULE I—CONDENSED FINANCIAL INFORMATION OF THE PARENT NACCO INDUSTRIES, INC. AND SUBSIDIARIES PARENT COMPANY CONDENSED BALANCE SHEETS December 31 2020 2019 (In thousands) ASSETS Cash and cash equivalents $ 85,365 $ 120,016 Accounts receivable from affiliates 495 515 Current intercompany accounts receivable, net — 1,255 Other current assets 20,648 10,448 Investment in subsidiaries 211,468 189,338 Property, plant and equipment, net 110 167 Other non-current assets 5,890 4,570 Total Assets $ 323,976 $ 326,309 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities $ 3,242 $ 5,257 Current intercompany accounts payable, net 2,337 — Current portion of deferred compensation — 13,465 Note payable to Bellaire 16,750 16,950 Other non-current liabilities 1,023 1,245 Stockholders’ equity 300,624 289,392 Total Liabilities and Stockholders’ Equity $ 323,976 $ 326,309 See Notes to Parent Company Condensed Financial Statements. SCHEDULE I—CONDENSED FINANCIAL INFORMATION OF THE PARENT NACCO INDUSTRIES, INC. AND SUBSIDIARIES PARENT COMPANY CONDENSED STATEMENTS OF COMPREHENSIVE INCOME Year Ended December 31 2020 2019 (In thousands) Expense (income): Intercompany interest expense $ 1,178 $ 1,190 Other, net (1,003) (1,796) 175 (606) Administrative and general expenses 5,658 6,403 Loss before income taxes (5,833) (5,797) Income tax provision (benefit) 2,419 (3,819) Net loss before equity in earnings of subsidiaries (8,252) (1,978) Equity in earnings of subsidiaries 23,045 41,610 Net income 14,793 39,632 Current period pension and postretirement plan adjustment, net of $213 tax benefit and $226 tax expense in 2020 and 2019, respectively (697) 758 Pension settlement, net of $202 tax benefit in 2019 — 671 Reclassification of pension and postretirement adjustments into earnings, net of $129 and $90 tax benefit in 2020 and 2019, respectively 435 845 Total other comprehensive income (262) 2,274 Comprehensive Income $ 14,531 $ 41,906 See Notes to Parent Company Condensed Financial Statements. SCHEDULE I—CONDENSED FINANCIAL INFORMATION OF THE PARENT NACCO INDUSTRIES, INC. AND SUBSIDIARIES PARENT COMPANY CONDENSED STATEMENTS OF CASH FLOWS Year Ended December 31 2020 2019 (In thousands) Operating Activities Net income $ 14,793 $ 39,632 Equity in earnings of subsidiaries 23,045 41,610 Parent company only net loss (8,252) (1,978) Net changes related to operating activities (22,822) 3,671 Net cash (used for) provided by operating activities (31,074) 1,693 Investing Activities Expenditures for property, plant and equipment — — Net cash used for investing activities — — Financing Activities Dividends received from subsidiaries 3,000 42,000 Notes payable to Bellaire (200) (350) Purchase of treasury shares (1,002) (3,010) Cash dividends paid (5,375) (5,132) Other — (4) Net cash (used for) provided by financing activities (3,577) 33,504 Cash and cash equivalents Increase (decrease) for the period (34,651) 35,197 Balance at the beginning of the period 120,016 84,819 Balance at the end of the period $ 85,365 $ 120,016 See Notes to Parent Company Condensed Financial Statements. SCHEDULE I—CONDENSED FINANCIAL INFORMATION OF THE PARENT NACCO INDUSTRIES, INC. AND SUBSIDIARIES NOTES TO PARENT COMPANY CONDENSED FINANCIAL STATEMENTS FOR THE YEAR ENDED DECEMBER 31, 2020 AND 2019 The notes to Consolidated Financial Statements, incorporated in Item 15 of this Form 10-K, are hereby incorporated by reference into these Notes to Parent Company Condensed Financial Statements. NOTE A — ACCOUNTING POLICIES NACCO Industries, Inc. ® (“NACCO” or the “parent company”) is the public holding company for The North American Coal Corporation ® ("NACoal"). In the Parent Company Condensed Financial Statements, NACCO's investment in subsidiaries is stated at cost plus equity in undistributed earnings of subsidiaries since the date of acquisition. NACCO's share of net income of unconsolidated subsidiaries is included in net income using the equity method. Parent Company financial statements should be read in conjunction with the Company's consolidated financial statements. NOTE B — LONG-TERM OBLIGATIONS AND GUARANTEES It is NACCO's policy not to guarantee the debt of NACoal. NOTE C — UNRESTRICTED CASH The amount of unrestricted cash available to NACCO, included in Investment in subsidiaries, was $0.7 million at December 31, 2020 and was in addition to the $85.4 million of cash included in the Parent Company Condensed Balance Sheet at December 31, 2020.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS NACCO INDUSTRIES, INC. AND SUBSIDIARIES YEAR ENDED DECEMBER 31, 2020 AND 2019 Additions Description Balance at Beginning of Period Charged to Charged to Deductions Balance at (In thousands) 2020 Reserves deducted from asset accounts: Deferred tax valuation allowances $ 12,296 $ (747) $ — — $ 11,549 2019 Reserves deducted from asset accounts: Deferred tax valuation allowances $ 14,219 $ (1,923) $ — $ — $ 12,296 (A) Balances which are not required to be presented and those which are immaterial have been omitted.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates: The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and judgments. These estimates and judgments affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities (if any) at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents: Cash and cash equivalents include cash in banks and highly liquid investments with original maturities of three months or less.
Inventories	Inventories: Inventories are stated at the lower of cost or net realizable value. The weighted average method is used for inventory valuation.
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net: Property, plant and equipment are initially recorded at cost. Depreciation, depletion and amortization are provided in amounts sufficient to amortize the cost of the assets, including assets recorded under finance leases, over their estimated useful lives using the straight-line method or the units-of-production method. Buildings and building improvements are depreciated over the life of the mine, which is generally 30 years. Estimated lives for machinery and equipment range from three
Royalty Interests in Oil and Natural Gas Properties	Royalty Interests in Oil and Natural Gas Properties: The Company follows the successful efforts method of accounting for oil and natural gas operations. Under this method, costs to acquire mineral and royalty interests in oil and natural gas properties are capitalized when incurred. Acquisitions of royalty interests of oil and natural gas properties are considered asset acquisitions and are recorded at cost. During the year ended December 31, 2020, the Company closed on multiple acquisitions of mineral and royalty interests for total consideration of $14.2 million, of which $12.0 million closed in December 2020, $2.0 million closed in November 2020 and $0.2 million closed in August 2020. These acquisitions are all located in the Permian Basin in Texas. The Company did not acquire any mineral interests in 2019. Acquisition costs of proven royalty interests are amortized using the units of production method over the life of the property, which is estimated using proven reserves. For purposes of amortization, interests in oil and natural gas properties are grouped in a reasonable aggregation of properties with common geological structural features or stratigraphic condition. The Company did not recognize any amortization expense related to the Company’s royalty interests in oil and natural gas properties for the year ended December 31, 2020. The Company reviews and evaluates its royalty interests in oil and natural gas properties for impairment when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Proven oil and gas properties are reviewed for impairment when events and circumstances indicate a potential decline in the fair value of such properties below the carrying value, such as a downward revision of the reserve estimates or lower commodity prices. When such events or changes in circumstances occur, the Company estimates the undiscounted future cash flows expected in connection with the
Long-Lived Assets	Long-Lived Assets: The Company periodically evaluates long-lived assets for impairment when changes in circumstances or the occurrence of certain events indicate the carrying amount of an asset or asset group may not be recoverable. Upon identification of indicators of impairment, the Company evaluates the carrying value of the asset by comparing the estimated future undiscounted cash flows generated from the use of the asset or asset group and its eventual disposition with the asset's net carrying value. If the carrying value of an asset is considered impaired, an impairment charge is recorded for the amount that the carrying value of the long-lived asset or asset group exceeds its fair value. Fair value is estimated as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See Note 9 for further discussion of the Company's nonrecurring fair value measurements. At MLMC, the costs of mining operations are not reimbursed by MLMC's customer. As such, increased costs at MLMC or decreased revenues could materially reduce the Company's profitability. Any reduction in customer demand at MLMC, including reductions related to reduced mechanical availability of the customer’s power plant, would adversely affect the Company's operating results and could result in significant impairments. MLMC has approximately $135 million of long-lived assets, including property, plant and equipment and its coal supply agreement intangible asset, which are subject to periodic impairment analyses and review. Identifying and assessing whether impairment indicators exist, or if events or changes in circumstances have occurred, including assumptions about future power plant dispatch levels, changes in future sales price, operating costs and other factors that impact anticipated revenue and customer demand, requires significant judgment. Actual future operating results could differ significantly from these estimates, which may result in an impairment charge in a future period, which could have a substantial impact on the Company’s results of operations.
Coal Supply Agreement	Coal Supply Agreement: The coal supply agreement represents a long-term supply agreement with MLMC's customer and was recorded based on the fair value at the date of acquisition. The coal supply agreement is amortized based on units of production over the term of the agreement, which expires in 2032. The Company reviews identified intangible assets for impairment when changes in circumstances or the occurrence of certain events indicate potential impairment.
Self-insurance Liabilities	Self-insurance Liabilities: The Company is generally self-insured for medical claims, certain workers’ compensation claims and certain closed mine liabilities. An estimated provision for claims reported and for claims incurred but not yet reported under the self-insurance programs is recorded and revised periodically based on industry trends, historical experience and management judgment. In addition, industry trends are considered within management's judgment for valuing claims. Changes in assumptions for such matters as legal judgments and settlements, inflation rates, medical costs and actual experience could cause estimates to change in the near term.
Stock Compensation	Stock Compensation: The Company maintains long-term incentive programs that allow for the grant of shares of Class A common stock, subject to restrictions, as a means of retaining and rewarding selected employees for long-term performance and to increase ownership in the Company. Shares awarded under the plans are fully vested and entitle the stockholder to all rights of common stock ownership except that shares may not be assigned, pledged or otherwise transferred during the restriction period. In general, for shares awarded for years ended December 31, 2020 and December 31, 2019, the restriction period ends at the earliest of (i) three years after the participant's retirement date, (ii) three five The Company also has a stock compensation plan for non-employee directors of the Company under which a portion of the annual retainer for each non-employee director is paid in restricted shares of Class A common stock. For the year ended December 31, 2020, $100,000 ($150,000 for the Chairman) of the non-employee director's annual retainer of $162,000 ($250,000 for the Chairman) was paid in restricted shares of Class A common stock. For the year ended December 31, 2019, $95,000 ($150,000 for the Chairman) of the non-employee director's annual retainer of $155,000 ($250,000 for the Chairman) was paid in restricted shares of Class A common stock. Shares awarded under the plan are fully vested and entitle the stockholder to all rights of common stock ownership except that shares may not be assigned, pledged or otherwise transferred during the restriction period. In general, the restriction period ends at the earliest of (i) ten years from the award date, (ii) the
Financial Instruments	Financial Instruments: Financial instruments held by the Company include cash and cash equivalents, accounts receivable, equity securities, accounts payable, revolving credit agreements and long-term debt.
Fair Value Measurements	Fair Value Measurements: The Company accounts for the fair value measurement of its financial assets and liabilities in accordance with U.S. generally accepted accounting principles, which defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A fair value hierarchy requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. Described below are the three levels of inputs that may be used to measure fair value: Level 1 - Quoted prices in active markets that are accessible at the measurement date for identical assets or liabilities. Level 2 - Observable prices that are based on inputs not quoted on active markets, but corroborated by market data. Level 3 - Unobservable inputs are used when little or no market data is available. The hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The classification of fair value measurements within the hierarchy is based upon the lowest level of input that is significant to the measurement. See Note 9 for further discussion of fair value measurements.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table disaggregates revenue by major sources for the years ended December 31: Major Goods/Service Lines 2020 2019 Coal Mining $ 72,088 $ 68,701 NAMining 42,392 42,823 Minerals Management 14,721 30,119 Unallocated Items 2,133 790 Eliminations (2,902) (1,443) Total revenues $ 128,432 $ 140,990 Timing of Revenue Recognition Goods transferred at a point in time $ 68,073 $ 66,102 Services transferred over time 60,359 74,888 Total revenues $ 128,432 $ 140,990
Contract Balances	The opening and closing balances of the Company’s current and long-term contract liabilities and receivables are as follows: Contract balances Trade accounts receivable, net Long-term asset Contract liability (current) Contract liability (long-term) Balance at January 1, 2020 $ 15,444 $ 1,977 $ 944 $ 2,153 Balance at December 31, 2020 18,894 4,984 941 3,626 Increase (decrease) $ 3,450 $ 3,007 $ (3) $ 1,473

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories are summarized as follows: December 31 2020 2019 Coal $ 17,695 $ 15,700 Mining supplies 29,856 24,765 Total inventories $ 47,551 $ 40,465

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment	Property, plant and equipment, net includes the following: December 31 2020 2019 Coal lands and real estate $ 50,887 $ 54,647 Mineral interests 14,181 — Plant and equipment 231,190 190,868 Property, plant and equipment, at cost 296,258 245,515 Less allowances for depreciation, depletion and amortization 123,841 107,454 $ 172,417 $ 138,061

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	The gross and net balances are set forth in the following table: Gross Carrying Accumulated Net Balance at December 31, 2020 Coal supply agreement $ 84,200 $ (48,870) $ 35,330 Balance at December 31, 2019 Coal supply agreement $ 84,200 $ (46,298) $ 37,902

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	12 Months Ended
	Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Change in Asset Retirement Obligation	A reconciliation of the Company's beginning and ending aggregate carrying amount of the asset retirement obligations are as follows: Coal Mining NAMining Unallocated Items NACCO Balance at January 1, 2019 $ 20,396 $ 485 $ 16,822 $ 37,703 Liabilities incurred during the period — 91 — 91 Liabilities settled during the period (8,265) — (752) (9,017) Accretion expense 1,260 28 1,323 2,611 Revision of estimated cash flows 5,624 — (153) 5,471 Balance at December 31, 2019 $ 19,015 $ 604 $ 17,240 $ 36,859 Liabilities incurred during the period 9,809 — — 9,809 Liabilities settled during the period (5,977) — (732) (6,709) Accretion expense 1,793 — 1,022 2,815 Revision of estimated cash flows 400 (604) (838) (1,042) Balance at December 31, 2020 $ 25,040 $ — $ 16,692 $ 41,732

Current and Long-Term Financi_2

Current and Long-Term Financing (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of Debt	The following table summarizes the Company's available and outstanding borrowings: December 31 2020 2019 Total outstanding borrowings of NACoal: Revolving credit agreement $ 30,000 $ 16,000 Other debt 16,465 8,943 Total debt outstanding $ 46,465 $ 24,943 Current portion of borrowings outstanding $ 22,112 $ 7,795 Long-term portion of borrowings outstanding 24,353 17,148 $ 46,465 $ 24,943 Total available borrowings, net of limitations, under revolving credit agreement $ 146,951 $ 148,644 Unused revolving credit agreement $ 116,951 $ 132,644 Weighted average stated interest rate on total borrowings 2.3 % 5.1 %
Schedule of Maturities of Total Debt, Excluding Capital Leases	Annual maturities of total debt, excluding leases, are as follows: 2021 20,924 2022 10,956 2023 990 2024 1,025 2025 1,061 Thereafter 10,041 $ 44,997

Fair Value Disclosure (Tables)

Fair Value Disclosure (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents the Company's assets accounted for at fair value on a recurring basis: Fair Value Measurements at Reporting Date Using Quoted Prices in Significant Active Markets for Significant Other Unobservable Identical Assets Observable Inputs Inputs Description December 31, 2020 (Level 1) (Level 2) (Level 3) Assets: Equity securities $ 13,164 $ 13,164 $ — $ — $ 13,164 $ 13,164 $ — $ — Fair Value Measurements at Reporting Date Using Quoted Prices in Significant Active Markets for Significant Other Unobservable Identical Assets Observable Inputs Inputs Description December 31, 2019 (Level 1) (Level 2) (Level 3) Assets: Equity securities $ 10,120 $ 10,120 $ — $ — $ 10,120 $ 10,120 $ — $ —

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Schedule of Leased Assets and Liabilities	Leased assets and liabilities include the following: Description Location DECEMBER 31 DECEMBER 31 Assets Operating Operating lease right-of-use assets $ 10,324 $ 11,398 Finance Property, plant and equipment, net (a) 1,478 544 Liabilities Current Operating Other current liabilities $ 1,457 $ 1,318 Finance Current maturities of long-term debt 1,188 558 Noncurrent Operating Operating lease liabilities $ 11,196 $ 12,448 Finance Long-term debt 280 85 (a) Finance leased assets are recorded net of accumulated amortization of $0.2 million and $1.9 million as of December 31, 2020 and December 31, 2019, respectively.
Lease Expense	The components of lease expense for the years ended December 31 are as follows: Description Location 2020 2019 Lease expense Operating lease cost Selling, general and administrative expenses $ 2,103 $ 2,251 Finance lease cost: Amortization of leased assets Cost of sales 164 570 Interest on lease liabilities Interest expense 19 18 Variable lease expense Selling, general and administrative expenses 588 555 Short-term lease expense Selling, general and administrative expenses 260 298 Total lease expense $ 3,134 $ 3,692
Finance Leases, Future Minimum Payments	Future minimum finance and operating lease payments were as follows at December 31, 2020: Finance Operating Total 2021 $ 1,229 $ 2,260 $ 3,489 2022 124 2,181 2,305 2023 102 1,705 1,807 2024 63 1,661 1,724 2025 7 1,469 1,476 Subsequent to 2025 — 7,952 7,952 Total minimum lease payments 1,525 17,228 $ 18,753 Amounts representing interest 57 4,575 Present value of net minimum lease payments $ 1,468 $ 12,653
Operating Leases, Future Minimum Payments	Future minimum finance and operating lease payments were as follows at December 31, 2020: Finance Operating Total 2021 $ 1,229 $ 2,260 $ 3,489 2022 124 2,181 2,305 2023 102 1,705 1,807 2024 63 1,661 1,724 2025 7 1,469 1,476 Subsequent to 2025 — 7,952 7,952 Total minimum lease payments 1,525 17,228 $ 18,753 Amounts representing interest 57 4,575 Present value of net minimum lease payments $ 1,468 $ 12,653
Assumptions Used for Leases	The assumptions used in accounting for ASC 842 for the years ended December 31 are as follows: Lease term and discount rate 2020 2019 Weighted average remaining lease term (years) Operating 8.92 9.63 Finance 1.38 0.75 Weighted average discount rate Operating 7.00 % 6.99 % Finance 4.11 % 5.95 %
Supplemental Cash Flow Information	The following table details cash paid for amounts included in the measurement of lease liabilities for the years ended December 31: Cash paid for amounts included in the measurement of lease liabilities 2020 2019 Operating cash flows from operating leases $ 2,223 $ 2,299 Operating cash flows from finance leases 19 18 Financing cash flows from finance leases 623 534

Stockholders' Equity and Earn_2

Stockholders' Equity and Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Schedule of Earnings Per Share	The weighted average number of shares of Class A common stock and Class B common stock outstanding used to calculate basic and diluted earnings per share were as follows: 2020 2019 Basic weighted average shares outstanding 7,026 6,974 Dilutive effect of restricted stock awards 31 33 Diluted weighted average shares outstanding 7,057 7,007 Basic earnings per share $ 2.11 $ 5.68 Diluted earnings per share $ 2.10 $ 5.66

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Income Tax Expense (Benefit)	The components of income (loss) before income tax provision (benefit) and the income tax provision (benefit) for the years ended December 31 are as follows: 2020 2019 Income (loss) before income tax provision (benefit) Domestic $ 13,990 $ 40,742 Foreign 268 2,657 $ 14,258 $ 43,399 Income tax provision (benefit) Current income tax provision (benefit): Federal $ (7,859) $ (6,473) State (408) 939 Foreign 215 603 Total current (8,052) (4,931) Deferred income tax provision: Federal 7,847 8,125 State (330) 573 Total deferred 7,517 8,698 $ (535) $ 3,767
Effective Income Tax Rate Reconciliation	A reconciliation of the federal statutory and effective income tax rate for the years ended December 31 is as follows: 2020 2019 Income before income tax provision $ 14,258 $ 43,399 Statutory taxes at 21.0% $ 2,994 $ 9,114 State and local income taxes (626) 1,129 Non-deductible expenses 426 736 Percentage depletion (3,744) (4,451) R&D and other federal credits (367) (255) Settlements and uncertain tax positions 6,286 (2,377) Coronavirus Aid, Relief, and Economic Security ("CARES") Act - carryback rate differential (4,741) — Other, net (763) (129) Income tax provision $ (535) $ 3,767 Effective income tax rate (3.8) % 8.7 %
Deferred Tax Assets and Liabilities	A detailed summary of the total deferred tax assets and liabilities in the Company's Consolidated Balance Sheets resulting from differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company’s deferred tax assets and liabilities are as follows: December 31 2020 2019 Deferred tax assets Lease liabilities $ 27,800 $ 30,875 Tax carryforwards 17,756 16,305 Inventories 3,742 1,704 Accrued liabilities 10,160 10,020 Employee benefits 2,747 4,853 Land valuation adjustment 5,536 4,304 Other 5,401 4,701 Total deferred tax assets 73,142 72,762 Less: Valuation allowance 11,549 12,296 61,593 60,466 Deferred tax liabilities Lease right-of-use assets 27,800 30,875 Depreciation and depletion 31,972 28,061 Partnership investment - development costs 11,686 9,949 Accrued pension benefits 7,685 3,919 Total deferred tax liabilities 79,143 72,804 Net deferred liability $ (17,550) $ (12,338)
Summary of Tax Credit Carryforwards	The following table summarizes the tax carryforwards and associated carryforward periods and related valuation allowances where the Company has determined that realization is uncertain: December 31, 2020 Net deferred tax Valuation Carryforwards State net operating loss $ 18,708 $ 14,478 2021-2040 Federal research credit 2,648 — 2034-2040 Total $ 21,356 $ 14,478 December 31, 2019 Net deferred tax Valuation Carryforwards State net operating loss $ 16,531 $ 13,668 2020-2039 Federal research credit 1,455 — 2034-2038 Federal foreign tax credit 463 463 2029 Alternative minimum tax ("AMT") credit 1,596 — (1) Total $ 20,045 $ 14,131 (1) The Tax Cuts and Jobs Act provided that AMT credits can be utilized to offset income taxes owed in tax years 2018 through 2020 with any remaining AMT credit refundable in 2021. The CARES Act revised this to allow AMT credits to be refundable in 2018 and 2019. The Company has reclassified its AMT credits to the current receivable as of December 31, 2020.
Unrecognized Tax Benefits Roll Forward	The following is a reconciliation of the Company's total gross unrecognized tax benefits, defined as the aggregate tax effect of differences between tax return positions and the benefits recognized in the financial statements for the years ended December 31, 2020 and 2019. The increase in the gross unrecognized tax benefits in 2020 is primarily due to tax positions related to worthlessness losses for which the timing of deductibility is uncertain. Approximately $6.3 million and $2.3 million of the gross unrecognized tax benefits as of December 31, 2020 and 2019, respectively, relate to permanent items that, if recognized, would impact the effective income tax rate. This amount differs from the gross unrecognized tax benefits presented in the table below due to (1) the deferred tax asset which would be available if the position were not sustained upon audit and (2) the decrease in U.S. federal income taxes which would occur upon the recognition of the state tax benefits included herein. 2020 2019 Balance at January 1 $ 2,860 $ 1,280 Additions based on tax positions related to prior years 2,774 1,172 Decreases based on settlements with tax authorities (803) — Additions based on tax positions related to the current year 5,628 408 Balance at December 31 $ 10,459 $ 2,860

Retirement Benefit Plans (Table

Retirement Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Assumptions used in accounting for the defined benefit plan	The assumptions used in accounting for the defined benefit plans were as follows for the years ended December 31: 2020 2019 Weighted average discount rates for pension benefit obligation 2.02% - 2.36% 2.98% - 3.20% Weighted average discount rates for net periodic benefit cost 2.98% - 3.20% 4.10% - 4.20% Expected long-term rate of return on assets for net periodic benefit cost 7.00 % 7.50 % The assumptions used in accounting for the postretirement health care plans are set forth below for the years ended December 31: 2020 2019 Weighted average discount rates for benefit obligation 1.37 % 2.65 % Weighted average discount rates for net periodic benefit cost 1.37% - 2.65% 3.80 % Health care cost trend rate assumed for next year 6.25 % 6.50 % Rate to which the cost trend rate is assumed to decline (ultimate trend rate) 5.0 % 5.0 % Year that the rate reaches the ultimate trend rate 2027 2025
Net periodic benefit income and expense for the defined benefit plan	Set forth below is a detail of the net periodic pension (income) expense for the defined benefit plans for the years ended December 31: 2020 2019 Interest cost $ 1,285 $ 1,710 Expected return on plan assets (2,435) (2,778) Amortization of actuarial loss 597 422 Amortization of prior service cost 58 58 Settlements — 873 Net periodic pension (income) expense $ (495) $ 285 Set forth below is a detail of the net periodic benefit (income) expense for the postretirement health care plans for the years ended December 31: 2020 2019 Service cost $ 21 $ 24 Interest cost 52 77 Amortization of actuarial (gain) loss (1) 8 Amortization of prior service credit (59) (80) Amortization of curtailment (31) — Net periodic benefit (income) expense $ (18) $ 29
Changes in plan assets and benefit obligations recognized in comprehensive income (loss)	Set forth below is detail of other changes in plan assets and benefit obligations recognized in other comprehensive loss (income) for the years ended December 31: 2020 2019 Current year actuarial loss (gain) $ 667 $ (1,030) Amortization of actuarial loss (597) (422) Amortization of prior service cost (58) (58) Settlements — (873) Total recognized in other comprehensive loss (income) $ 12 $ (2,383) Set forth below is a detail of other changes in plan assets and benefit obligations recognized in other comprehensive income for the years ended December 31: 2020 2019 Current year actuarial loss $ 194 $ 46 Amortization of actuarial gain (loss) 1 (8) Amortization of prior service credit 59 80 Amortization of curtailment 31 — Transfers 46 — Total recognized in other comprehensive income $ 331 $ 118
Changes in benefit obligations during the year and funded status of defined benefit plan	The following table sets forth the changes in the benefit obligation and the plan assets during the year and the funded status of the defined benefit plans at December 31: 2020 2019 Change in benefit obligation Projected benefit obligation at beginning of year $ 41,854 $ 42,026 Interest cost 1,285 1,710 Actuarial loss 3,996 3,121 Benefits paid (2,535) (2,391) Settlements — (2,612) Projected benefit obligation at end of year $ 44,600 $ 41,854 Accumulated benefit obligation at end of year $ 44,600 $ 41,854 Change in plan assets Fair value of plan assets at beginning of year $ 37,364 $ 34,954 Actual return on plan assets 5,763 6,930 Employer contributions 507 483 Benefits paid (2,535) (2,391) Settlements — (2,612) Fair value of plan assets at end of year $ 41,099 $ 37,364 Funded status at end of year $ (3,501) $ (4,490) Amounts recognized in the balance sheets consist of: Non-current assets $ 4,070 $ 3,079 Current liabilities (549) (606) Non-current liabilities (7,022) (6,963) $ (3,501) $ (4,490) Components of accumulated other comprehensive loss (income) consist of: Actuarial loss $ 14,022 $ 13,951 Prior service cost 761 819 Deferred taxes (3,316) (3,305) $ 11,467 $ 11,465 The following sets forth the changes in benefit obligations during the year and the funded status of the postretirement health care at December 31: 2020 2019 Change in benefit obligation Benefit obligation at beginning of year $ 2,049 $ 2,113 Service cost 21 24 Interest cost 52 77 Plan amendments 49 — Actuarial loss 145 46 Benefits paid (262) (211) Benefit obligation at end of year $ 2,054 $ 2,049 Funded status at end of year $ (2,054) $ (2,049) Amounts recognized in the balance sheets consist of: Current liabilities $ (238) $ (204) Noncurrent liabilities (1,816) (1,845) $ (2,054) $ (2,049) Components of accumulated other comprehensive loss (income) consist of: Actuarial loss $ 466 $ 227 Prior service credit (167) (259) Deferred taxes (167) (96) $ 132 $ (128)
Future benefit payments	Future pension benefit payments expected to be paid from assets of the pension plans are: 2021 $ 2,631 2022 2,600 2023 2,676 2024 2,695 2025 2,666 2026 - 2030 12,866 $ 26,134 Future postretirement health care benefit payments expected to be paid are: 2021 239 2022 226 2023 211 2024 196 2025 171 2026 - 2030 688 $ 1,731
Actual allocation percentage and target allocation percentage for pension plan assets	The following is the actual allocation percentage and target allocation percentage for the pension plan assets at December 31: 2020 2019 Target Allocation U.S. equity securities 45.4 % 45.1 % 36.0% - 54.0% Non-U.S. equity securities 20.3 % 20.0 % 16.0% - 24.0% Fixed income securities 33.9 % 34.4 % 30.0% - 40.0% Money market 0.4 % 0.5 % 0.0% - 10.0%
Fair value of pension plan assets	The fair value of each major category of the Company's pension plan assets are valued using quoted market prices in active markets for identical assets, or Level 1 in the fair value hierarchy. Following are the values as of December 31: Level 1 2020 2019 U.S. equity securities $ 18,640 $ 16,862 Non-U.S. equity securities 8,335 7,482 Fixed income securities 13,948 12,854 Money market 176 166 Total $ 41,099 $ 37,364

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Schedule of Revenue by Major Customers by Reporting Segments	The following represents the revenue attributable to each of these entities as a percentage of consolidated revenue for those years: Percentage of Consolidated Revenue Segment 2020 2019 Coal Mining customer 55 % 48 % NAMining customer 19 % 21 % Minerals Management lessee less than 10% 12 %
Segment Reporting Information	The following tables present revenue, operating profit, depreciation expense and capital expenditures for the years ended December 31: 2020 2019 Revenues Coal Mining $ 72,088 $ 68,701 NAMining 42,392 42,823 Minerals Management 14,721 30,119 Unallocated Items 2,133 790 Eliminations (2,902) (1,443) Total $ 128,432 $ 140,990 Operating profit (loss) Coal Mining $ 25,436 $ 34,120 NAMining 1,872 (564) Minerals Management 3,493 25,721 Unallocated Items (17,256) (20,713) Eliminations (97) 256 Total $ 13,448 $ 38,820 Expenditures for property, plant and equipment and acquisition of mineral interests Coal Mining $ 14,825 $ 15,092 NAMining 13,862 8,824 Minerals Management 15,474 517 Unallocated Items 207 231 Total $ 44,368 $ 24,664 Depreciation, depletion and amortization Coal Mining $ 14,213 $ 12,409 NAMining 2,470 2,223 Minerals Management 1,308 1,362 Unallocated Items 123 246 Total $ 18,114 $ 16,240

Parent Company Condensed Bala_2

Parent Company Condensed Balance Sheets (Tables)	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Condensed Balance Sheet	The condensed balance sheets of NACCO, the parent company, at December 31 are as follows: 2020 2019 ASSETS Cash and cash equivalents $ 85,365 $ 120,016 Accounts receivable from affiliates 495 515 Current intercompany accounts receivable, net — 1,255 Other current assets 20,648 10,448 Investment in subsidiaries 211,468 189,338 Property, plant and equipment, net 110 167 Other non-current assets 5,890 4,570 Total Assets $ 323,976 $ 326,309 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities $ 3,242 $ 5,257 Current intercompany accounts payable, net 2,337 — Current portion of deferred compensation — 13,465 Note payable to Bellaire 16,750 16,950 Other non-current liabilities 1,023 1,245 Stockholders’ equity 300,624 289,392 Total Liabilities and Stockholders’ Equity $ 323,976 $ 326,309

Unconsolidated Subsidiaries (Ta

Unconsolidated Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Condensed Financial Statements	Summarized financial information for the unconsolidated subsidiaries is as follows: 2020 2019 Statement of Operations Revenue $ 768,660 $ 734,515 Gross profit $ 69,021 $ 72,433 Income before income taxes $ 60,398 $ 65,183 Net income $ 50,933 $ 54,067 Balance Sheet Current assets $ 186,934 $ 183,848 Non-current assets $ 959,032 $ 837,477 Current liabilities $ 143,843 $ 141,132 Non-current liabilities $ 995,658 $ 875,216

Principles of Consolidation a_2

Principles of Consolidation and Nature of Operations (Narrative) (Details) $ in Thousands, T in Millions	12 Months Ended
	Dec. 31, 2020USD ($)segmentT	Dec. 31, 2019USD ($)T
Long-term Purchase Commitment [Line Items]
Number of operating segments | segment	3
Earnings from unconsolidated operations | $	$ 60,203	$ 63,883
Coal Mining customer | Sabine
Long-term Purchase Commitment [Line Items]
Historical lignite coal annual delivery	1.9	2.6
Earnings from unconsolidated operations | $	$ 3,900	$ 4,600
Coal Mining customer | Sabine | Minimum
Long-term Purchase Commitment [Line Items]
Expected future lignite coal annual delivery	1.4
Coal Mining customer | Sabine | Maximum
Long-term Purchase Commitment [Line Items]
Expected future lignite coal annual delivery	1.7
Coal Mining customer | Caddo Creek
Long-term Purchase Commitment [Line Items]
Historical lignite coal annual delivery	0.1	0.2
Coal Mining customer | Camino Real Fuels, LLC
Long-term Purchase Commitment [Line Items]
Historical lignite coal annual delivery	0.3	1.6
Coal Mining customer | Falkirk
Long-term Purchase Commitment [Line Items]
Historical lignite coal annual delivery	7.2	7.4
Earnings from unconsolidated operations | $	$ 16,100	$ 15,900
Coal Mining customer | Falkirk | Long-term Contract with Customer
Long-term Purchase Commitment [Line Items]
Historical lignite coal annual delivery	0.3

Significant Accounting Polici_3

Significant Accounting Policies (Property Plant and Equipment & Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2020
Building and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	30 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	15 years

Significant Accounting Polici_4

Significant Accounting Policies (Royalty Interests in Oil and Natural Gas Properties) (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2020	Nov. 30, 2020	Aug. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Acquisition of mineral and royalty interest	$ 12,000	$ 2,000	$ 200	$ 14,181	$ 0

Significant Accounting Polici_5

Significant Accounting Policies (Long-Lived Assets) (Details) $ in Millions	Dec. 31, 2020USD ($)
MLMC
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Long-lived assets	$ 135

Significant Accounting Polici_6

Significant Accounting Policies (Stock-based Compensation and Other) (Details) - Class A Common Stock - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Executives | Share-based Payment Arrangement [Member]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during the year under the Company's stock compensation plans (shares)	79,380	85,567
Class A common stock available for issuance under the plan (shares)	335,053
Compensation expense related to share awards	$ 2,000,000	$ 4,100,000
Compensation expense related to share awards, net of tax	1,600,000	3,300,000
Chairman | Restricted stock
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of directors, annual retainer paid in restricted shares	150,000	150,000
Annual non-employee directors retainer amount	$ 250,000	250,000
Non-employee directors | Share-based Payment Arrangement [Member]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class A common stock available for issuance under the plan (shares)	33,821
Compensation expense related to share awards	$ 1,000,000	1,100,000
Compensation expense related to share awards, net of tax	$ 800,000	$ 900,000
Non-employee directors | Restricted stock
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during the year under the Company's stock compensation plans (shares)	42,744	22,258
Amount of directors, annual retainer paid in restricted shares	$ 100,000	$ 95,000
Annual non-employee directors retainer amount	$ 162,000	$ 155,000
Non-employee directors | Voluntary shares
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during the year under the Company's stock compensation plans (shares)	745	432
Percentage of annual retainer that may be received in shares of Class A stock (percent)	100.00%
Participant's retirement date | Executives | Share-based Payment Arrangement [Member]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	3 years
Participants retirement from board of directors | Non-employee directors | Share-based Payment Arrangement [Member]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	5 years
Minimum age of director upon retirement from board | Non-employee directors | Share-based Payment Arrangement [Member]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	70 years
Award date | Executives | Share-based Payment Arrangement [Member]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	5 years
Award date | Non-employee directors | Share-based Payment Arrangement [Member]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	10 years
Minimum | Award date | Executives | Share-based Payment Arrangement [Member]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	3 years
Maximum | Award date | Executives | Share-based Payment Arrangement [Member]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of restrictions on stock assignment, pledges or transfers	10 years

Revenue Recognition (Disaggrega

Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 128,432	$ 140,990
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	68,073	66,102
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	60,359	74,888
Operating Segments | Coal Mining customer
Disaggregation of Revenue [Line Items]
Revenues	72,088	68,701
Operating Segments | NAMining
Disaggregation of Revenue [Line Items]
Revenues	42,392	42,823
Operating Segments | Minerals Management lessee
Disaggregation of Revenue [Line Items]
Revenues	14,721	30,119
Unallocated Items
Disaggregation of Revenue [Line Items]
Revenues	2,133	790
Eliminations
Disaggregation of Revenue [Line Items]
Revenues	$ (2,902)	$ (1,443)

Revenue Recognition (Contract B

Revenue Recognition (Contract Balances) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Trade accounts receivable, net
Balance, January 1, 2020	$ 15,444
Balance, December 31, 2020	18,894
Increase (decrease) in accounts receivable	3,450
Long-term asset
Balance, January 1, 2020	1,977
Balance, December 31, 2020	4,984
Increase (decrease) in long-term assets	3,007
Contract liability (current)
Balance, January 1, 2020	944
Balance, December 31, 2020	941
Increase (decrease) in contract liability (current)	(3)
Contract liability (long-term)
Balance, January 1, 2020	2,153
Balance, December 31, 2020	3,626
Increase (decrease) in contract liability (long-term)	$ 1,473

Revenue Recognition (Narrative)

Revenue Recognition (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Primary term of contract	5 years
Opening contract liability	$ 900,000	$ 900,000
Contract assets recognized	$ 0

Revenue Recognition (Remaining

Revenue Recognition (Remaining Performance Obligations) (Details) $ in Millions	Dec. 31, 2020USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue from Contract with Customer [Abstract]
Revenue expected to be recognized	$ 0.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 0.9
Remaining performance period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue from Contract with Customer [Abstract]
Revenue expected to be recognized	$ 3.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 3.1
Remaining performance period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue from Contract with Customer [Abstract]
Revenue expected to be recognized	$ 0.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 0.3
Remaining performance period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue from Contract with Customer [Abstract]
Revenue expected to be recognized	$ 0.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 0.1
Remaining performance period	1 year

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Coal	$ 17,695	$ 15,700
Mining supplies	29,856	24,765
Total inventories	47,551	40,465
Inventory impairment	$ 1,973	$ 0

Property, Plant and Equipment_3

Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 296,258	$ 245,515
Less allowances for depreciation, depletion and amortization	123,841	107,454
Property, plant and equipment, net	172,417	138,061
Depreciation, depletion and amortization	15,500	13,600
Coal lands and real estate
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	50,887	54,647
Mineral interests
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	14,181	0
Plant and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 231,190	$ 190,868

Intangible Assets (Details)

Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]
Net Balance	$ 35,330	$ 37,902
Amortization of intangible assets	2,572	2,614
Expected annual amortization expense, 2022	3,100
Coal supply agreement
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	84,200	84,200
Accumulated Amortization	(48,870)	(46,298)
Net Balance	35,330	$ 37,902
NACoal
Finite-Lived Intangible Assets, Net [Abstract]
Expected annual amortization expense, 2021	3,100
Expected annual amortization expense, 2023	3,200
Expected annual amortization expense, 2024	3,100
Expected annual amortization expense, 2025	$ 3,200

Asset Retirement Obligations (A

Asset Retirement Obligations (ARO Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Carrying amount of the asset retirement obligations, balance at beginning of period	$ 36,859	$ 37,703
Liabilities incurred during the period	9,809	91
Liabilities settled during the period	(6,709)	(9,017)
Accretion expense	2,815	2,611
Revision of estimated cash flows	(1,042)	5,471
Carrying amount of the asset retirement obligations, balance at end of period	41,732	36,859
Operating Segments | Coal Mining customer
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Carrying amount of the asset retirement obligations, balance at beginning of period	19,015	20,396
Liabilities incurred during the period	9,809	0
Liabilities settled during the period	(5,977)	(8,265)
Accretion expense	1,793	1,260
Revision of estimated cash flows	400	5,624
Carrying amount of the asset retirement obligations, balance at end of period	25,040	19,015
Operating Segments | NAMining customer
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Carrying amount of the asset retirement obligations, balance at beginning of period	604	485
Liabilities incurred during the period	0	91
Liabilities settled during the period	0	0
Accretion expense	0	28
Revision of estimated cash flows	(604)	0
Carrying amount of the asset retirement obligations, balance at end of period	0	604
Unallocated Items
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Carrying amount of the asset retirement obligations, balance at beginning of period	17,240	16,822
Liabilities incurred during the period	0	0
Liabilities settled during the period	(732)	(752)
Accretion expense	1,022	1,323
Revision of estimated cash flows	(838)	(153)
Carrying amount of the asset retirement obligations, balance at end of period	$ 16,692	$ 17,240

Asset Retirement Obligations (D

Asset Retirement Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Asset retirement obligation	$ 9,809	$ 91
Revision of estimated cash flows	(1,042)	5,471
MLMC
Segment Reporting Information [Line Items]
Asset retirement obligation	9,800
Asset capitalized as a component of property, plant and equipment, net	9,800
Revision of estimated cash flows		3,100
Bellaire
Segment Reporting Information [Line Items]
Fair value of trust assets	11,100	10,100
Centennial
Segment Reporting Information [Line Items]
Increase (decrease) in asset retirement obligation	4,800	5,400
Escrow account	3,800	2,400
Settlement receivable from third parties	1,400
Other long-term liabilities, contingent and noncontingent guarantee liabilities	2,400
Company transferred		3,400
Net loss on the transactions		400
Revision of estimated cash flows		$ 2,000
Centennial | Surety Bond
Segment Reporting Information [Line Items]
Surety bonds outstanding	$ 5,800

Current and Long-Term Financi_3

Current and Long-Term Financing (Debt Schedule) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Current portion of borrowings outstanding	$ 2,112	$ 795
Long-term portion of borrowings outstanding	24,353	17,148
NACoal
Debt Instrument [Line Items]
Revolving credit agreement	30,000	16,000
Other debt	16,465	8,943
Total debt outstanding	46,465	24,943
Current portion of borrowings outstanding	22,112	7,795
Long-term portion of borrowings outstanding	24,353	17,148
Total available borrowings, net of limitations, under revolving credit agreement	146,951	148,644
Unused revolving credit agreement	$ 116,951	$ 132,644
Weighted average stated interest rate on total borrowings	2.30%	5.10%

Current and Long-Term Financi_4

Current and Long-Term Financing (Debt Maturity Schedule) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
2021	$ 20,924
2022	10,956
2023	990
2024	1,025
2025	1,061
Thereafter	10,041
Long-term debt	$ 44,997	$ 24,300

Current and Long-Term Financi_5

Current and Long-Term Financing (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 15, 2026
Line of Credit Facility [Line Items]
Interest paid	$ 1,400,000	$ 900,000
Outstanding notes payable	44,997,000	24,300,000
NACoal
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	150,000,000
Line of credit facility, amount outstanding	30,000,000	16,000,000
Line of credit facility, remaining borrowing capacity	116,951,000	132,644,000
Amount of letters of credit outstanding	$ 3,000,000
Line of credit facility, unused capacity, commitment fee percentage	0.30%
Weighted average interest rate	1.88%
Minimum interest coverage ratio	4
Fixed charge coverage ratio	1.10
Line of credit facility, availability required to pay dividends	$ 15,000,000
NACoal | Maximum
Line of Credit Facility [Line Items]
Maximum debt to EBITDA ratio	3
Maximum EBITDA ratio	2
NACoal | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.75%
NACoal | LIBOR Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
Secured Debt | Demand Note Payable to Unconsolidated Subsidiary
Line of Credit Facility [Line Items]
Outstanding notes payable	$ 4,400,000	$ 2,000,000
Interest rate	0.14%	1.68%
Secured Debt | Notes Payable, Maturing December 2026 And April 1, 2027
Line of Credit Facility [Line Items]
Outstanding notes payable	$ 10,600,000	$ 6,300,000
Interest rate	4.20%
Secured Debt | Notes Payable, Maturing December 2026
Line of Credit Facility [Line Items]
Debt instrument term	10 years
Secured Debt | Notes Payable, Maturing April 1, 2027
Line of Credit Facility [Line Items]
Debt instrument term	7 years
Secured Debt | Forecast | Notes Payable, Maturing December 2026
Line of Credit Facility [Line Items]
Principal payment due at maturity			$ 4,400,000

Fair Value Disclosure (Schedule

Fair Value Disclosure (Schedule of Assets and Liabilities) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Quoted prices in active markets for identical assets (level 1)
Assets:
Equity securities	$ 13,164	$ 10,120
Total assets accounted for at fair value on a recurring basis	13,164	10,120
Significant other observable inputs (level 2)
Assets:
Equity securities	0	0
Total assets accounted for at fair value on a recurring basis	0	0
Significant unobservable inputs (level 3)
Assets:
Equity securities	0	0
Total assets accounted for at fair value on a recurring basis	0	0
Estimate of Fair Value Measurement
Assets:
Equity securities	13,164	10,120
Total assets accounted for at fair value on a recurring basis	$ 13,164	$ 10,120

Fair Value Disclosure (Narrativ

Fair Value Disclosure (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on equity securities	$ 1,226	$ 1,545
Long-term debt fair value	45,200	24,300
Long-term Debt	44,997	24,300
Mineral Management
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived asset write off	7,300
Coal Mining customer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived asset write off	1,100
Level 1 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on equity securities	100
Level 1 | Fair Value, Measurements, Recurring | Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in equity securities	2,000
Level 1 | Fair Value, Measurements, Recurring | Bellaire
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on equity securities	$ 1,200	$ 1,500

Leases (Schedule of Leased Asse

Leases (Schedule of Leased Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Operating lease, assets	$ 10,324	$ 11,398
Finance lease, assets	$ 1,478	$ 544
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Current liabilities
Operating lease liabilities, current	$ 1,457	$ 1,318
Finance lease liabilities, current	$ 1,188	$ 558
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Liabilities, Noncurrent
Operating lease liabilities, noncurrent	$ 11,196	$ 12,448
Finance lease liabilities, noncurrent	$ 280	$ 85
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligations	us-gaap:LongTermDebtAndCapitalLeaseObligations
Finance lease, right-of-use asset, accumulated amortization	$ 200	$ 1,900

Leases (Components of Lease Exp

Leases (Components of Lease Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 2,103	$ 2,251
Amortization of leased assets	164	570
Interest on lease liabilities	19	18
Variable lease expense	588	555
Short-term lease expense	260	298
Total lease expense	$ 3,134	$ 3,692

Leases (Future Minimum Lease Pa

Leases (Future Minimum Lease Payments) (Details) $ in Thousands	Dec. 31, 2020USD ($)
Finance Leases
2021	$ 1,229
2022	124
2023	102
2024	63
2025	7
Subsequent to 2025	0
Total minimum lease payments	1,525
Amounts representing interest	57
Present value of net minimum lease payments	1,468
Operating Leases
2021	2,260
2022	2,181
2023	1,705
2024	1,661
2025	1,469
Subsequent to 2025	7,952
Total minimum lease payments	17,228
Amounts representing interest	4,575
Present value of net minimum lease payments	12,653
Total
2021	3,489
2022	2,305
2023	1,807
2024	1,724
2025	1,476
Subsequent to 2025	7,952
Total minimum lease payments	$ 18,753

Leases (Assumptions Used in Acc

Leases (Assumptions Used in Accounting for Leases) (Details)	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease, weighted average remaining lease term (years)	8 years 11 months 1 day	9 years 7 months 17 days
Finance lease, weighted average remaining lease term (years)	1 year 4 months 17 days	9 months
Operating lease, weighted average discount rate	7.00%	6.99%
Finance lease, weighted average discount rate	4.11%	5.95%

Leases (Supplemental Cash Flow

Leases (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 2,223	$ 2,299
Operating cash flows from finance leases	19	18
Financing cash flows from finance leases	$ 623	$ 534

Stockholders' Equity and Earn_3

Stockholders' Equity and Earnings Per Share (Textual) (Details)	12 Months Ended
	Dec. 31, 2020USD ($)voteshares	Dec. 31, 2019USD ($)shares	Nov. 06, 2019USD ($)
Class of Stock [Line Items]
Aggregate purchase price | $	$ 1,002,000	$ 3,010,000
2019 Stock Repurchase Program
Class of Stock [Line Items]
Authorized amount available for repurchase | $			$ 25,000,000
Aggregate purchase price | $	$ 1,000,000	$ 3,000,000
Class A Common Stock
Class of Stock [Line Items]
Votes per share | vote	1
Common stock, shares authorized (in shares)	25,000,000
Treasury stock (in shares)	2,726,017	2,817,714
Class A Common Stock | 2019 Stock Repurchase Program
Class of Stock [Line Items]
Treasury stock, shares acquired (in shares)	32,286	28,094
Class A Common Stock | 2018 Stock Repurchase Program
Class of Stock [Line Items]
Treasury stock, shares acquired (in shares)		44,476
Class B Common Stock
Class of Stock [Line Items]
Votes per share | vote	10
Common stock, shares authorized (in shares)	6,756,176

Stockholders' Equity and Earn_4

Stockholders' Equity and Earnings Per Share (Weighted Average Number of Shares Outstanding Reconciliation) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Basic weighted average shares outstanding (in shares)	7,026	6,974
Dilutive effect of restricted stock awards (in shares)	31	33
Diluted weighted average shares outstanding (in shares)	7,057	7,007
Earnings per share:
Basic earnings per share (USD per share)	$ 2.11	$ 5.68
Diluted earnings per share (USD per share)	$ 2.10	$ 5.66

Income Taxes (Income Before Inc

Income Taxes (Income Before Income Taxes and Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income (loss) before income tax provision (benefit)
Domestic	$ 13,990	$ 40,742
Foreign	268	2,657
Income before income tax (benefit) provision	14,258	43,399
Current income tax provision (benefit):
Federal	(7,859)	(6,473)
State	(408)	939
Foreign	215	603
Total current	(8,052)	(4,931)
Deferred income tax provision:
Federal	7,847	8,125
State	(330)	573
Total deferred	7,517	8,698
Income tax provision	$ (535)	$ 3,767

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax payments	$ 400	$ 1,000
Income tax refunds	4,200	2,600
Income tax (benefit) provision	(535)	3,767
Income before income tax provision	$ 14,258	$ 43,399
Effective income tax rate	(3.80%)	8.70%
Discrete tax charges	$ 7,300
Discrete tax benefits	$ 4,700	$ 2,500
Annual effective income tax rate, excluding discrete items	22.00%	14.50%
Change in income before income tax	$ 29,100
Gross unrecognized tax benefits	6,300	$ 2,300
Net (benefit) expense in interest and penalties related to uncertain tax positions	100	100
Interest and penalties accrued	$ 100	$ 100

Income Taxes (Reconciliation of

Income Taxes (Reconciliation of the Federal Statutory and Effective Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income before income tax provision	$ 14,258	$ 43,399
Statutory taxes at 21.0%	2,994	9,114
State and local income taxes	(626)	1,129
Non-deductible expenses	426	736
Percentage depletion	(3,744)	(4,451)
R&D and other federal credits	(367)	(255)
Settlements and uncertain tax positions	6,286	(2,377)
Coronavirus Aid, Relief, and Economic Security ("CARES") Act - carryback rate differential	(4,741)	0
Other, net	(763)	(129)
Income tax provision	$ (535)	$ 3,767
Effective income tax rate	(3.80%)	8.70%

Income Taxes (Summary of the To

Income Taxes (Summary of the Total Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
Lease liabilities	$ 27,800	$ 30,875
Tax carryforwards	17,756	16,305
Inventories	3,742	1,704
Accrued liabilities	10,160	10,020
Employee benefits	2,747	4,853
Land valuation adjustment	5,536	4,304
Other	5,401	4,701
Total deferred tax assets	73,142	72,762
Less: Valuation allowance	11,549	12,296
Deferred tax assets, net of valuation allowance	61,593	60,466
Deferred tax liabilities
Lease right-of-use assets	27,800	30,875
Depreciation and depletion	31,972	28,061
Partnership investment - development costs	11,686	9,949
Accrued pension benefits	7,685	3,919
Total deferred tax liabilities	79,143	72,804
Net deferred liability	$ (17,550)	$ (12,338)

Income Taxes (Summary of Operat

Income Taxes (Summary of Operating Loss Carryforwards and Tax Credit Carryforwards) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Net deferred tax asset, net operating loss	$ 17,756	$ 16,305
Total net deferred tax asset	21,356	20,045
Total valuation allowance	14,478	14,131
State and local jurisdiction
Operating Loss Carryforwards [Line Items]
Net deferred tax asset, net operating loss	18,708	16,531
Valuation allowance, net operating loss	14,478	13,668
Valuation allowance, tax credit		0
Net deferred tax asset, alternative minimum tax credit		1,596
Federal tax authority
Operating Loss Carryforwards [Line Items]
Net deferred tax asset, tax credit carryforwards, research	2,648	1,455
Valuation allowance, tax credit	$ 0	0
Foreign tax authority
Operating Loss Carryforwards [Line Items]
Valuation allowance, tax credit		463
Net deferred tax asset, federal foreign tax credit		$ 463

Income Taxes (Gross Unrecognize

Income Taxes (Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of period	$ 2,860	$ 1,280
Additions based on tax positions related to prior years	2,774	1,172
Decreases based on settlements with tax authorities	(803)	0
Additions based on tax positions related to the current year	5,628	408
Balance at end of period	$ 10,459	$ 2,860

Retirement Benefit Plans (Narra

Retirement Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, total costs	$ 2,800	$ 2,700
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Settlement charge	$ 0	$ 873

Retirement Benefit Plans (Assum

Retirement Benefit Plans (Assumptions Used in Accounting for Defined Benefit Plans) (Details) - Pension Plan	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets for net periodic benefit cost	7.00%	7.50%
Minimum
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rates for pension benefit obligation	2.02%	2.98%
Weighted average discount rates for net periodic benefit cost	2.98%	4.10%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rates for pension benefit obligation	2.36%	3.20%
Weighted average discount rates for net periodic benefit cost	3.20%	4.20%

Retirement Benefit Plans (Net P

Retirement Benefit Plans (Net Periodic Benefit Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,285	$ 1,710
Expected return on plan assets	(2,435)	(2,778)
Amortization of actuarial (gain) loss	597	422
Amortization of prior service cost	58	58
Settlements	0	873
Net periodic pension (income) expense	(495)	285
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	21	24
Interest cost	52	77
Amortization of actuarial (gain) loss	(1)	8
Amortization of prior service cost	(59)	(80)
Amortization of curtailment	(31)	0
Net periodic pension (income) expense	$ (18)	$ 29

Retirement Benefit Plans (Other

Retirement Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss (Income)) (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial loss (gain)	$ 667	$ (1,030)
Amortization of actuarial loss	(597)	(422)
Amortization of prior service cost	(58)	(58)
Settlements	0	(873)
Total recognized in other comprehensive loss (income)	$ 12	$ (2,383)

Retirement Benefit Plans (Oblig

Retirement Benefit Plans (Obligation and Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Amounts recognized in the balance sheets consist of:
Non-current liabilities	$ (8,838)	$ (8,807)
Pension Plan
Change in benefit obligation
Projected benefit obligation at beginning of year	41,854	42,026
Interest cost	1,285	1,710
Actuarial loss	3,996	3,121
Benefits paid	(2,535)	(2,391)
Settlements	0	(2,612)
Projected benefit obligation at end of year	44,600	41,854
Accumulated benefit obligation at end of year	44,600	41,854
Change in plan assets
Fair value of plan assets at beginning of year	37,364	34,954
Actual return on plan assets	5,763	6,930
Employer contributions	507	483
Benefits paid	(2,535)	(2,391)
Settlements	0	(2,612)
Fair value of plan assets at end of year	41,099	37,364
Funded status at end of year	(3,501)	(4,490)
Amounts recognized in the balance sheets consist of:
Non-current assets	4,070	3,079
Current liabilities	(549)	(606)
Non-current liabilities	(7,022)	(6,963)
Amount recognized in the balance sheets	(3,501)	(4,490)
Components of accumulated other comprehensive loss (income) consist of:
Actuarial loss	14,022	13,951
Prior service cost	761	819
Deferred taxes	(3,316)	(3,305)
Accumulated other comprehensive (loss) income	11,467	11,465
Other Postretirement Benefits Plan
Change in benefit obligation
Projected benefit obligation at beginning of year	2,049	2,113
Service cost	21	24
Interest cost	52	77
Plan amendments	49	0
Actuarial loss	145	46
Benefits paid	(262)	(211)
Projected benefit obligation at end of year	2,054	2,049
Change in plan assets
Funded status at end of year	(2,054)	(2,049)
Amounts recognized in the balance sheets consist of:
Current liabilities	(238)	(204)
Non-current liabilities	(1,816)	(1,845)
Amount recognized in the balance sheets	(2,054)	(2,049)
Components of accumulated other comprehensive loss (income) consist of:
Actuarial loss	466	227
Prior service cost	(167)	(259)
Deferred taxes	(167)	(96)
Accumulated other comprehensive (loss) income	$ 132	$ (128)

Retirement Benefit Plans (Sched

Retirement Benefit Plans (Schedule of Expected Benefit Payments) (Details) $ in Thousands	Dec. 31, 2020USD ($)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
2021	$ 2,631
2022	2,600
2023	2,676
2024	2,695
2025	2,666
2026 - 2030	12,866
Total	26,134
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
2021	239
2022	226
2023	211
2024	196
2025	171
2026 - 2030	688
Total	$ 1,731

Retirement Benefit Plans (Actua

Retirement Benefit Plans (Actual Allocation Percentage and Target Allocation Percentage for the U.S. Pension Plan Assets) (Details) - Pension Plan	Dec. 31, 2020	Dec. 31, 2019
U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	45.40%	45.10%
Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	20.30%	20.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	33.90%	34.40%
Money market
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	0.40%	0.50%
Minimum | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	36.00%
Minimum | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	16.00%
Minimum | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	30.00%
Minimum | Money market
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	0.00%
Maximum | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	54.00%
Maximum | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	24.00%
Maximum | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	40.00%
Maximum | Money market
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	10.00%

Retirement Benefit Plans (Fair

Retirement Benefit Plans (Fair Value Hierarchy) (Details) - Pension Plan - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	$ 41,099	$ 37,364	$ 34,954
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	41,099	37,364
Level 1 | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	18,640	16,862
Level 1 | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	8,335	7,482
Level 1 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	13,948	12,854
Level 1 | Money market
Defined Benefit Plan Disclosure [Line Items]
Fair value of each major category of U.S. plan assets	$ 176	$ 166

Retirement Benefit Plans (Ass_2

Retirement Benefit Plans (Assumptions Used in Accounting for Postretirement Benefit Plans) (Details) - Other Postretirement Benefits Plan	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted average discount rates for pension benefit obligation	1.37%	2.65%
Weighted average discount rates for net periodic benefit cost		3.80%
Health care cost trend rate assumed for next year	6.25%	6.50%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2027	2025
Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted average discount rates for net periodic benefit cost	1.37%
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted average discount rates for net periodic benefit cost	2.65%

Retirement Benefit Plans (Oth_2

Retirement Benefit Plans (Other Changes in Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income) (Details) - Other Postretirement Benefits Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial loss	$ 194	$ 46
Amortization of actuarial gain (loss)	1	(8)
Amortization of prior service credit	59	80
Amortization of curtailment	31	0
Transfers	46	0
Total recognized in other comprehensive loss (income)	$ 331	$ 118

Business Segments (Concentratio

Business Segments (Concentration Risk) (Details) - Percentage of Consolidated Revenue - Customer concentration risk	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Coal Mining customer | Coal Mining customer
Segment Reporting Information [Line Items]
Percentage of Consolidated Revenue	55.00%	48.00%
NAMining customer | NAMining customer
Segment Reporting Information [Line Items]
Percentage of Consolidated Revenue	19.00%	21.00%
Minerals Management lessee | Minerals Management lessee (less than in 2020)
Segment Reporting Information [Line Items]
Percentage of Consolidated Revenue	10.00%	12.00%

Business Segments (Textual) (De

Business Segments (Textual) (Details)	12 Months Ended
	Dec. 31, 2020
Coal Mining customer | Customer concentration risk | Earnings of Unconsolidated Mines | Top Two Customers - Basin Electric and GRE
Segment Reporting Information [Line Items]
Revenue from major customer, percentage	60.00%

Business Segments (Details)

Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 128,432	$ 140,990
Operating profit (loss)	13,448	38,820
Expenditures for property, plant and equipment and acquisition of mineral interests	44,368	24,664
Depreciation, depletion and amortization	18,114	16,240
Operating Segments | Coal Mining customer
Segment Reporting Information [Line Items]
Revenues	72,088	68,701
Operating profit (loss)	25,436	34,120
Expenditures for property, plant and equipment and acquisition of mineral interests	14,825	15,092
Depreciation, depletion and amortization	14,213	12,409
Operating Segments | NAMining customer
Segment Reporting Information [Line Items]
Revenues	42,392	42,823
Operating profit (loss)	1,872	(564)
Expenditures for property, plant and equipment and acquisition of mineral interests	13,862	8,824
Depreciation, depletion and amortization	2,470	2,223
Operating Segments | Minerals Management
Segment Reporting Information [Line Items]
Revenues	14,721	30,119
Operating profit (loss)	3,493	25,721
Expenditures for property, plant and equipment and acquisition of mineral interests	15,474	517
Depreciation, depletion and amortization	1,308	1,362
Unallocated Items
Segment Reporting Information [Line Items]
Revenues	2,133	790
Operating profit (loss)	(17,256)	(20,713)
Expenditures for property, plant and equipment and acquisition of mineral interests	207	231
Depreciation, depletion and amortization	123	246
Eliminations
Segment Reporting Information [Line Items]
Revenues	(2,902)	(1,443)
Operating profit (loss)	$ (97)	$ 256

Parent Company Condensed Bala_3

Parent Company Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 88,450	$ 122,892
Accounts receivable from affiliates	4,764	6,411
Other non-current assets	40,984	32,133
Total assets	476,179	444,773
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities	52,257	61,966
Deferred compensation	0	13,465
Other non-current liabilities	12,060	6,188
Stockholders’ equity	300,624	289,392	$ 250,704
Total liabilities and equity	476,179	444,773
Parent Company
ASSETS
Cash and cash equivalents	85,365	120,016
Accounts receivable from affiliates	495	515
Current intercompany accounts receivable, net	0	1,255
Other current assets	20,648	10,448
Investment in subsidiaries	211,468	189,338
Property, plant and equipment, net	110	167
Other non-current assets	5,890	4,570
Total assets	323,976	326,309
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities	3,242	5,257
Current intercompany accounts payable, net	2,337	0
Deferred compensation	0	13,465
Other non-current liabilities	1,023	1,245
Stockholders’ equity	300,624	289,392
Total liabilities and equity	323,976	326,309
Restricted investments	1,700
Unrestricted investment	700
Parent Company | Bellaire
LIABILITIES AND STOCKHOLDERS’ EQUITY
Note payable to Bellaire	$ 16,750	$ 16,950

Unconsolidated Subsidiaries (De

Unconsolidated Subsidiaries (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated subsidiaries	$ 28,978	$ 24,611
Statement of Operations
Revenues	128,432	140,990
Gross profit	16,969	31,128
Net income	14,793	39,632
Balance Sheet
Current assets	188,146	200,668
Current liabilities	52,257	61,966
Unconsolidated mines | NACoal
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated subsidiaries	29,000	24,600
Maximum risk of loss	6,500	5,000
Balance Sheet
Dividends from unconsolidated mines	49,700	53,500
Unconsolidated mines | NACoal | Variable Interest Entity, Not Primary Beneficiary
Statement of Operations
Revenues	768,660	734,515
Gross profit	69,021	72,433
Income before income taxes	60,398	65,183
Net income	50,933	54,067
Balance Sheet
Current assets	186,934	183,848
Assets, Noncurrent	959,032	837,477
Current liabilities	143,843	141,132
Non-current liabilities	$ 995,658	$ 875,216

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Jones Day
Related Party Transaction [Line Items]
Legal services	$ 1	$ 1
Mr. Rankin
Related Party Transaction [Line Items]
Legal services	$ 0.5	$ 0.5

Other Events and Transactions (

Other Events and Transactions (Details) $ in Millions	3 Months Ended
	Dec. 31, 2020USD ($)
Other Events And Transactions [Abstract]
General and administrative charges	$ 1.8
Unpaid accrued payroll	$ 1.6

Schedule I - Condensed Financ_2

Schedule I - Condensed Financial Information of the Parent (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 88,450	$ 122,892
Accounts receivable from affiliates	4,764	6,411
Other non-current assets	40,984	32,133
Total assets	476,179	444,773
LIABILITIES AND EQUITY
Current liabilities	52,257	61,966
Current portion of deferred compensation	0	13,465
Other long-term liabilities	12,060	6,188
Stockholders’ equity	300,624	289,392	$ 250,704
Total liabilities and equity	476,179	444,773
Parent Company
ASSETS
Cash and cash equivalents	85,365	120,016
Accounts receivable from affiliates	495	515
Current intercompany accounts receivable, net	0	1,255
Other current assets	20,648	10,448
Investment in subsidiaries	211,468	189,338
Property, plant and equipment, net	110	167
Other non-current assets	5,890	4,570
Total assets	323,976	326,309
LIABILITIES AND EQUITY
Current liabilities	3,242	5,257
Current intercompany accounts payable, net	2,337	0
Current portion of deferred compensation	0	13,465
Other long-term liabilities	1,023	1,245
Stockholders’ equity	300,624	289,392
Total liabilities and equity	323,976	326,309
Parent Company | Bellaire
LIABILITIES AND EQUITY
Note payable to Bellaire	$ 16,750	$ 16,950

Schedule I - Condensed Financ_3

Schedule I - Condensed Financial Information of the Parent (Condensed Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Other, net	$ (1,140)	$ (527)
Other (income) expense	(810)	(4,579)
Administrative and general expenses	53,062	53,783
Income tax provision (benefit)	(535)	3,767
Net income	14,793	39,632
Current period pension and postretirement plan adjustment, net of $213 tax benefit and $226 tax expense in 2020 and 2019, respectively	(697)	758
Pension settlement, net of $202 tax benefit in 2019	0	671
Reclassification of pension and postretirement adjustments into earnings, net of $129 and $90 tax benefit in 2020 and 2019, respectively	435	845
Total other comprehensive income	(262)	2,274
Comprehensive income	14,531	41,906
Current period pension and postretirement plan adjustment, tax (benefit) expense	(213)	226
Pension settlement, tax		202
Reclassification of pension and post retirement adjustments into earnings, tax benefit	129	90
Parent Company
Condensed Financial Statements, Captions [Line Items]
Intercompany interest expense	1,178	1,190
Other, net	(1,003)	(1,796)
Other (income) expense	175	(606)
Administrative and general expenses	5,658	6,403
Loss before income taxes	(5,833)	(5,797)
Income tax provision (benefit)	2,419	(3,819)
Net loss before equity in earnings of subsidiaries	(8,252)	(1,978)
Equity in earnings of subsidiaries	(23,045)	(41,610)
Net income	14,793	39,632
Current period pension and postretirement plan adjustment, net of $213 tax benefit and $226 tax expense in 2020 and 2019, respectively	(697)	758
Pension settlement, net of $202 tax benefit in 2019	0	671
Reclassification of pension and postretirement adjustments into earnings, net of $129 and $90 tax benefit in 2020 and 2019, respectively	435	845
Total other comprehensive income	(262)	2,274
Comprehensive income	14,531	41,906
Current period pension and postretirement plan adjustment, tax (benefit) expense	(213)	226
Pension settlement, tax		202
Reclassification of pension and post retirement adjustments into earnings, tax benefit	$ 129	$ 90

Schedule I - Condensed Financ_4

Schedule I - Condensed Financial Information of the Parent (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net cash (used for) provided by operating activities	$ (2,486)	$ 52,784
Investing Activities
Expenditures for property, plant and equipment	(30,187)	(24,664)
Net cash used for investing activities	(45,984)	(20,262)
Financing Activities
Purchase of treasury shares	(1,002)	(3,010)
Cash dividends paid	(5,375)	(5,132)
Other	332	(3)
Net cash provided by financing activities	14,028	5,113
Cash and Cash Equivalents
Total (decrease) increase for the year	(34,442)	37,635
Balance at the beginning of the year	122,892	85,257
Balance at the end of the year	88,450	122,892
Parent Company
Operating Activities
Net income	14,793	39,632
Equity in earnings of subsidiaries	23,045	41,610
Net loss before equity in earnings of subsidiaries	(8,252)	(1,978)
Net changes related to operating activities	(22,822)	3,671
Net cash (used for) provided by operating activities	(31,074)	1,693
Investing Activities
Expenditures for property, plant and equipment	0	0
Net cash used for investing activities	0	0
Financing Activities
Dividends received from subsidiaries	3,000	42,000
Notes payable to Bellaire	(200)	(350)
Purchase of treasury shares	(1,002)	(3,010)
Cash dividends paid	(5,375)	(5,132)
Other	0	(4)
Net cash provided by financing activities	(3,577)	33,504
Cash and Cash Equivalents
Total (decrease) increase for the year	(34,651)	35,197
Balance at the beginning of the year	120,016	84,819
Balance at the end of the year	$ 85,365	$ 120,016

Schedule I - Condensed Financ_5

Schedule I - Condensed Financial Information of the Parent (Textual) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 88,450	$ 122,892
Parent Company
Condensed Financial Statements, Captions [Line Items]
Unrestricted investment	700
Cash and cash equivalents	$ 85,365	$ 120,016

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Details) - Deferred tax valuation allowances - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period	$ 12,296	$ 14,219
Charged to Costs and Expenses	(747)	(1,923)
Charged to Other Accounts — Describe	0	0
Deductions — Describe	0	0
Balance at End of Period	$ 11,549	$ 12,296