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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net income from operations $ 1,469 $ 1,084
Adjustments to reconcile net income from operations to net cash provided by operating activities:    
Depreciation 1,800 2,011
Stock-based compensation expense 383 589
Bad debt expense 168 0
Gain from disposal of assets (127) 0
Income from equity investment in joint venture (247) (393)
Realized and unrealized losses on natural gas derivatives, net 0 421
Changes in operating assets and liabilities:    
Accounts receivable 1,964 2,044
Prepaid expenses and other current assets 235 507
Accounts payable and accrued liabilities (1,812) (6,361)
Other 96 191
Net cash provided by operating activities 3,929 93
Cash flows from investing activities:    
Acquisition of fixed assets (873) (3,727)
Proceeds from sale of assets 207 0
Net cash used in investing activities (666) (3,727)
Cash flows from financing activities:    
Payments on short- and long-term notes payable (346) (365)
Payments on notes payable from related parties 0 (596)
Employee tax payments from restricted stock withholdings (9) 0
Net cash used in financing activities (355) (961)
Effect of exchange rate changes on cash 4 5
Net increase (decrease) in cash and cash equivalents 2,912 (4,590)
Cash and cash equivalents, beginning of period 5,374 11,451
Cash and cash equivalents, end of period $ 8,286 $ 6,861