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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating activities:      
Net income (loss) $ 2,992 $ 4,649 $ (703)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Depreciation, depletion and accretion of asset retirement obligation 28,936 27,472 26,488
Amortization of intangible assets 792 793 792
Net loss (gain) on disposal of assets 1,062 1,802 (294)
Amortization of deferred financing cost 145 105 105
Accretion of debt discount 92 186 186
Loss on extinguishment of debt 1,341 0 0
Deferred income taxes (2,784) (6,137) (4,196)
Stock-based compensation, net 3,216 3,507 3,184
Employee stock purchase plan compensation 23 24 25
Changes in assets and liabilities:      
Accounts receivable (17,750) 12,672 (18,264)
Unbilled receivables (2,750) (2,640) 1,805
Inventory 1,779 (6,638) (5,161)
Prepaid expenses and other assets 212 1,996 6,524
Deferred revenue (1,101) (5,805) (9,311)
Settlement of asset retirement obligation 0 (197) 0
Accounts payable 53 1,974 5,244
Accrued expenses and other liabilities 1,606 (2,772) (1,004)
Net cash provided by operating activities 17,864 30,991 5,420
Investing activities:      
Acquisition, net of cash acquired 0 0 (6,547)
Purchases of property, plant and equipment (7,010) (23,031) (12,731)
Proceeds from disposal of assets 89 129 1,070
Net cash used in investing activities (6,921) (22,902) (18,208)
Financing activities:      
Dividend payments to stockholders (3,902) 0 0
Proceeds from the issuance of notes payable 9,755 0 0
Repayments of notes payable (10,263) (10,435) (7,325)
Proceeds from revolving credit facility 30,975 23,000 10,000
Repayment of revolving credit facility (38,975) (15,000) (10,000)
Payments under finance leases (221) (394) (116)
Payment of deferred financing and debt issuance costs (1,232) 0 0
Payment for debt extinguishment costs (1,227) 0 0
Employee stock purchase plan issuance 51 56 52
Royalty stock issuance 0 0 639
Purchase of treasury stock (422) (4,754) (540)
Net cash used in financing activities (15,461) (7,527) (7,290)
Net increase in cash and cash equivalents (4,518) 562 (20,078)
Cash and cash equivalents at beginning of year 6,072 5,510 25,588
Cash and cash equivalents at end of year $ 1,554 $ 6,072 $ 5,510