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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income (loss) $ (1,092) $ 2,493
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 5,569 5,344
Stock-based compensation expense 447 1,084
Provision for credit losses 315 88
Loss (gain) on disposal of assets 62 (301)
Income from equity investment in joint venture (859) (1,162)
Distributions from equity investment in joint venture 1,637 1,716
Cash settlements from natural gas derivatives, net 178 (359)
Realized and unrealized (gains) losses on natural gas derivatives, net 202 123
Changes in operating assets and liabilities:    
Accounts receivable (976) 1,845
Prepaid expenses and other current assets 698 857
Accounts payable and accrued liabilities 1,697 (155)
Other 56 (51)
Net cash provided by operating activities 7,934 11,522
Cash flows from investing activities:    
Acquisition of fixed assets (4,999) (3,561)
Proceeds from sale of fixed assets 211 381
Net cash used in investing activities (4,788) (3,180)
Cash flows from financing activities:    
Payments on short- and long-term notes payable and finance leases (1,784) (1,280)
Payment of debt issuance costs (42) 0
Employee tax payments from restricted stock withholdings (17) (9)
Net cash used in financing activities (1,843) (1,289)
Effect of exchange rate changes on cash 15 (34)
Net increase in cash and cash equivalents 1,318 7,019
Cash and cash equivalents, beginning of period 8,987 5,374
Cash and cash equivalents, end of period $ 10,305 $ 12,393