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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities:    
Net income (loss) $ (1,598) $ 1,469
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 1,867 1,800
Stock-based compensation expense 447 383
Bad debt expense 7 168
Gain on disposal of assets (103) (127)
Income from equity investment in joint venture (417) (247)
Cash settlements from natural gas derivatives, net 163 0
Realized and unrealized (gains) losses on natural gas derivatives, net (84) 0
Changes in operating assets and liabilities:    
Accounts receivable 1,540 1,964
Prepaid expenses and other current assets 423 235
Accounts payable and accrued liabilities (1,229) (1,812)
Other 9 96
Net cash provided by operating activities 1,025 3,929
Cash flows from investing activities:    
Acquisition of fixed assets (487) (873)
Proceeds from sale of fixed assets 211 207
Net cash used in investing activities (276) (666)
Cash flows from financing activities:    
Payments on short- and long-term notes payable and finance leases (671) (346)
Payment of debt issuance costs (42) 0
Employee tax payments from restricted stock withholdings (17) (9)
Net cash used in financing activities (730) (355)
Effect of exchange rate changes on cash (3) 4
Net increase in cash and cash equivalents 16 2,912
Cash and cash equivalents, beginning of period 8,987 5,374
Cash and cash equivalents, end of period $ 9,003 $ 8,286