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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:      
Net income (loss) $ 116,042 $ 39,759 $ (4,907)
Adjustments to reconcile net income to net cash from operating activities:      
Accretion of asset retirement obligations 1,115 615 570
Depreciation and amortization 41,194 26,205 20,912
Amortization of debt issuance costs 491 214 58
Stock-based compensation 8,222 5,260 4,140
Loss on disposal of equipment 756    
Other income - gain on sale of mineral rights (2,113)    
Other income - employee retention tax credit   (5,407)  
Other income - PPP loan     (8,444)
Deferred income taxes 29,229 4,644 (3,503)
Changes in operating assets and liabilities:      
Accounts receivable 3,279 (24,154) (1,043)
Prepaid expenses and other current assets (14,378) 5,519 986
Inventories (29,182) (3,844) 3,314
Other assets and liabilities 1,127 1,124 (1,270)
Accounts payable 12,727 (1,820) 2,753
Accrued expenses 19,361 5,225 (254)
Net cash provided by operating activities 187,870 53,340 13,312
Cash flow from investing activities:      
Capital expenditures (123,012) (29,466) (24,753)
Proceeds from sale of mineral rights 2,000    
Other (1,061)    
Net cash used for investing activities (145,708) (59,613) (24,753)
Cash flows from financing activities:      
Proceeds from PPP Loan     8,444
Proceeds from borrowings 42,000 54,368 50,043
Proceeds from stock options exercised 107    
Payments of debt issuance cost   (2,356)  
Payment of dividends (20,041)    
Repayment of borrowings (26,026) (26,300) (45,598)
Repayment of Ramaco Coal acquisition financing - related party (15,000)    
Repayments of insurance financing (1,290) (862) (1,382)
Repayments of equipment finance leases (5,062) (1,942)  
Shares surrendered for withholding taxes payable (3,183) (539) (221)
Net cash (used for) provided by financing activities (28,495) 22,369 11,286
Net change in cash and cash equivalents and restricted cash 13,667 16,096 (155)
Cash and cash equivalents and restricted cash, beginning of period 22,806 6,710 6,865
Cash and cash equivalents and restricted cash, end of period 36,473 22,806 6,710
Supplemental cash flow information:      
Cash paid for interest 5,997 1,601 1,095
Cash paid for taxes 15,500 9 19
Non-cash investing and financing activities:      
Leased assets obtained under new financing leases 7,888 10,002  
Financed equipment purchases 6,409    
Capital expenditures included in accounts payable and accrued expenses 13,404 6,652 1,228
Financed insurance 5,587 280 $ 1,588
Accrued dividends payable 5,524 2,501  
Ramaco Coal Asset Acquisition      
Cash flow from investing activities:      
Acquisition of assets (11,738)    
Non-cash investing and financing activities:      
Coal acquisition 56,551    
Maben Asset Acquisition      
Cash flow from investing activities:      
Acquisition of assets (11,897)    
Non-cash investing and financing activities:      
Coal acquisition $ 21,000    
Amonate Asset Acquisition      
Cash flow from investing activities:      
Acquisition of assets   $ (30,147)