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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Operating activities:    
Net (loss) income $ (744) $ 9,435
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligations 21,090 20,359
Amortization of intangible assets 596 596
Net loss on disposal of fixed assets 1,069 1,821
Amortization of deferred financing cost 89 79
Accretion of debt discount 92 140
Loss on extinguishment of debt 1,341 0
Deferred income taxes (2,217) (4,096)
Stock-based compensation, net 2,348 2,472
Employee stock purchase plan compensation 18 20
Changes in assets and liabilities:    
Accounts receivable (933) 11,888
Unbilled receivables (181) (244)
Inventory (1,015) (5,770)
Prepaid expenses and other assets (39) 4,856
Deferred revenue 196 (4,942)
Accounts payable (6,219) (3,871)
Accrued and other expenses 1,338 907
Net cash provided by operating activities 16,829 33,650
Investing activities:    
Purchases of property, plant and equipment (5,135) (16,126)
Proceeds from disposal of assets 81 123
Net cash used in investing activities (5,054) (16,003)
Financing activities:    
Proceeds from the issuance of notes payable 9,755 0
Repayments of notes payable (9,540) (8,952)
Proceeds from revolving credit facility 16,975 15,000
Repayment of revolving credit facility (24,975) (15,000)
Payments under finance leases (167) (323)
Payment of deferred financing and debt issuance costs (1,129) 0
Payment for debt extinguishment costs (1,227) 0
Employee stock purchase plan issuance 51 56
Purchase of treasury stock (375) (4,629)
Net cash used in financing activities (10,632) (13,848)
Net increase (decrease) in cash and cash equivalents 1,143 3,799
Cash and cash equivalents at beginning of year 6,072 5,510
Cash and cash equivalents at end of period 7,215 9,309
Supplemental disclosure of cash flow information    
Purchases of property, plant and equipment in accounts payable and accrued expenses 1,517 2,351
Treasury stock purchased with debt 0 4,425
Fixed assets purchased with debt $ 2,214 $ 0