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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities:    
Net loss $ (216) $ (3,599)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligations 7,241 6,553
Amortization of intangible assets 199 199
Net loss on disposal of fixed assets 3 1,889
Amortization of deferred financing cost 26 26
Accretion of debt discount 47 47
Deferred income taxes 596 1,669
Stock-based compensation, net 642 779
Employee stock purchase plan compensation 6 7
Changes in assets and liabilities:    
Accounts receivable (9,344) (74)
Unbilled receivables (2,640) (1,363)
Inventory 1,240 101
Prepaid expenses and other assets (240) (676)
Deferred revenue 1,220 (1,058)
Accounts payable (6,730) 1,165
Accrued and other expenses 4,087 (560)
Net cash (used in) provided by operating activities (3,863) 5,105
Investing activities:    
Purchases of property, plant and equipment (1,646) (4,018)
Proceeds from disposal of assets 1 1
Net cash used in investing activities (1,645) (4,017)
Financing activities:    
Repayments of notes payable (1,340) (1,513)
Payments under finance leases (56) (86)
Payment of deferred financing and debt issuance costs (425) 0
Proceeds from revolving credit facility 6,000 14,000
Repayment of revolving credit facility 0 (7,000)
Employee stock purchase plan issuance 25 33
Purchase of treasury stock (170) (4,428)
Net cash provided by financing activities 4,034 1,006
Net (decrease) increase in cash and cash equivalents (1,474) 2,094
Cash and cash equivalents at beginning of year 6,072 5,510
Cash and cash equivalents at end of period 4,598 7,604
Supplemental disclosure of cash flow information    
Purchases of property, plant and equipment in accounts payable and accrued expenses 1,544 1,975
Treasury stock purchased with debt $ 0 $ 4,425