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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss from continuing operations $ (1,297) $ (1,410)
Adjustments to reconcile net loss from continuing operations to net cash provided by operating activities:    
Depreciation 6,006 6,589
Stock-based compensation expense 1,695 1,741
Gain from disposal of fixed assets (1,002) (34)
Income from equity investment in joint venture (1,466) (1,126)
Cash settlements from natural gas derivatives, net 0 (1,179)
Realized and unrealized losses on natural gas derivatives 540 513
Distributions from equity investment in joint venture 813 1,550
Changes in operating assets and liabilities:    
Accounts receivable 5,636 (977)
Prepaid expenses and other current assets 948 529
Accounts payable and accrued liabilities (6,633) 5,174
Other 140 (570)
Net cash provided by operating activities from continuing operations 5,380 10,800
Net cash provided by operating activities from discontinued operations 0 738
Net cash provided by operating activities 5,380 11,538
Cash flows from investing activities:    
Acquisition of fixed assets (8,982) (1,746)
Proceeds from sale of fixed assets 0 100
Proceeds from assets held for sale 0 2,049
Net cash provided by (used in) investing activities from continuing operations (8,982) 403
Net cash used in investing activities from discontinued operations 0 (334)
Net cash provided by (used in) investing activities (8,982) 69
Cash flows from financing activities:    
Proceeds from borrowings on short- and long-term notes payable 0 1,000
Payments on short- and long-term notes payable (860) (1,555)
Payments on notes payable and finance leases from related parties (1,813) (669)
Payment of debt issuance costs (108) 0
Employee tax payments from restricted stock withholdings (162) (85)
Net cash used in financing activities from continuing operations (2,943) (1,309)
Net cash used in financing activities from discontinued operations 0 (113)
Net cash used in financing activities (2,943) (1,422)
Effect of exchange rate changes on cash 8 7
Net increase (decrease) in cash and cash equivalents (6,537) 10,192
Cash and cash equivalents, beginning of period 11,451 910
Cash and cash equivalents, end of period $ 4,914 $ 11,102