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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Operating activities:    
Net (loss) income $ (646) $ 2,708
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligations 14,496 13,338
Amortization of intangible assets 398 398
Net loss on disposal of fixed assets 6 1,913
Amortization of deferred financing cost 53 53
Accretion of debt discount 92 93
Loss on extinguishment of debt 1,310 0
Deferred income taxes 2,927 (1,748)
Stock-based compensation, net 1,482 1,612
Employee stock purchase plan compensation 12 15
Changes in assets and liabilities:    
Accounts receivable (3,001) 5,908
Unbilled receivables (1,771) (336)
Inventory 1,793 (2,820)
Prepaid expenses and other assets 118 4,195
Deferred revenue (518) (614)
Accounts payable (7,247) (2,049)
Accrued and other expenses 1,515 (1,493)
Net cash provided by operating activities 11,019 21,173
Investing activities:    
Purchases of property, plant and equipment (3,000) (9,245)
Proceeds from disposal of assets 2 73
Net cash used in investing activities (2,998) (9,172)
Financing activities:    
Proceeds from the issuance of notes payable 9,109 0
Repayments of notes payable (8,904) (7,450)
Proceeds from revolving credit facility 15,000 15,000
Repayment of revolving credit facility (21,000) (15,000)
Payments under finance leases (114) (123)
Payment of deferred financing and debt issuance costs (503) 0
Payment for debt extinguishment costs (1,227) 0
Employee stock purchase plan issuance 25 33
Purchase of treasury stock (222) (4,479)
Net cash used in financing activities (7,836) (12,019)
Net increase (decrease) in cash and cash equivalents 185 (18)
Cash and cash equivalents at beginning of year 6,072 5,510
Cash and cash equivalents at end of period 6,257 5,492
Supplemental disclosure of cash flow information    
Purchases of property, plant and equipment in accounts payable and accrued expenses 1,310 3,752
Treasury stock purchased with debt 0 4,425
Fixed assets purchased with debt $ 1,358 $ 0