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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net income (loss) $ (2,211) $ 1,496
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 3,727 3,568
Stock-based compensation expense 447 791
Bad debt expense 113 68
Gain on disposal of assets (103) (199)
Income from equity investment in joint venture (537) (587)
Distributions from equity investment in joint venture 1,637 1,716
Cash settlements from natural gas derivatives, net 239 (359)
Realized and unrealized (gains) losses on natural gas derivatives, net 141 30
Changes in operating assets and liabilities:    
Accounts receivable 1,745 1,736
Prepaid expenses and other current assets 636 680
Accounts payable and accrued liabilities (331) (133)
Other 37 160
Net cash provided by operating activities 5,540 8,967
Cash flows from investing activities:    
Acquisition of fixed assets (1,122) (2,249)
Proceeds from sale of fixed assets 211 279
Net cash used in investing activities (911) (1,970)
Cash flows from financing activities:    
Payments on short- and long-term notes payable and finance leases (1,351) (875)
Payment of debt issuance costs (42) 0
Employee tax payments from restricted stock withholdings (17) (9)
Net cash used in financing activities (1,410) (884)
Effect of exchange rate changes on cash 14 (4)
Net increase in cash and cash equivalents 3,233 6,109
Cash and cash equivalents, beginning of period 8,987 5,374
Cash and cash equivalents, end of period $ 12,220 $ 11,483