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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Operating activities:    
Net loss $ (2,835) $ (646)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligations 14,604 14,496
Amortization of intangible assets 396 398
Net (gain) loss on disposal of fixed assets (720) 6
Amortization of deferred financing cost 121 145
Loss on extinguishment of debt 0 1,310
Deferred income taxes (4,611) 2,927
Stock-based compensation, net 1,921 1,482
Employee stock purchase plan compensation 12 12
Changes in assets and liabilities:    
Accounts receivable (6,195) (3,001)
Unbilled receivables 5,310 (1,771)
Inventory (3,616) 1,793
Prepaid expenses and other assets (789) 118
Deferred revenue (36) (518)
Accounts payable (1,284) (7,247)
Accrued and other expenses 1,309 1,515
Net cash provided by operating activities 3,587 11,019
Investing activities:    
Purchases of property, plant and equipment (6,212) (3,000)
Proceeds from disposal of assets 740 2
Net cash used in investing activities (5,472) (2,998)
Financing activities:    
Dividend payments to stockholders (79) 0
Proceeds from the issuance of notes payable 0 9,109
Repayments of notes payable (1,762) (8,904)
Proceeds from revolving credit facility 25,000 15,000
Repayment of revolving credit facility (16,000) (21,000)
Payments under finance leases (112) (114)
Payment of deferred financing and debt issuance costs (10) (503)
Payment for debt extinguishment costs 0 (1,227)
Employee stock purchase plan issuance 26 25
Repurchase of treasury stock from restricted stock vesting (372) (222)
Repurchase of treasury stock from Repurchase Program (2,067) 0
Net cash provided by (used in) financing activities 4,624 (7,836)
Net increase in cash and cash equivalents 2,739 185
Cash and cash equivalents at beginning of year 1,554 6,072
Cash and cash equivalents at end of period 4,293 6,257
Supplemental disclosure of cash flow information    
Purchases of property, plant and equipment in accounts payable and accrued expenses 1,081 1,310
Fixed assets purchased with debt $ 1,846 $ 1,358