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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net income (loss) from operations $ 1,496 $ (1,090)
Adjustments to reconcile net income (loss) from operations to net cash provided by operating activities:    
Depreciation 3,568 4,003
Stock-based compensation expense 791 1,182
Bad debt expense 68 0
Gain from disposal of assets (199) 0
Income from equity investment in joint venture (587) (1,134)
Cash settlements from natural gas derivatives, net (359) 0
Realized and unrealized losses on natural gas derivatives, net 30 491
Distributions from equity investment in joint venture 1,716 813
Changes in operating assets and liabilities:    
Accounts receivable 1,736 7,008
Prepaid expenses and other current assets 680 827
Accounts payable and accrued liabilities (133) (8,385)
Other 160 187
Net cash provided by operating activities 8,967 3,902
Cash flows from investing activities:    
Acquisition of fixed assets (2,249) (5,211)
Proceeds from sale of assets 279 0
Net cash used in investing activities (1,970) (5,211)
Cash flows from financing activities:    
Payments on short- and long-term notes payable (875) (731)
Payments on notes payable from related parties 0 (1,200)
Employee tax payments from restricted stock withholdings (9) (108)
Net cash used in financing activities (884) (2,039)
Effect of exchange rate changes on cash (4) 18
Net increase (decrease) in cash and cash equivalents 6,109 (3,330)
Cash and cash equivalents, beginning of period 5,374 11,451
Cash and cash equivalents, end of period $ 11,483 $ 8,121