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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income (loss) from continuing operations $ (1,090) $ (2,434)
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by operating activities:    
Depreciation 4,003 4,474
Stock-based compensation expense 1,182 1,139
Income from equity investment in joint venture (1,134) (921)
Realized and unrealized losses on natural gas derivatives 491 899
Distributions from equity investment in joint venture 813 1,550
Changes in operating assets and liabilities:    
Accounts receivable 7,008 (464)
Prepaid expenses and other current assets 827 (889)
Accounts payable and accrued liabilities (8,385) 1,270
Other 187 (596)
Net cash provided by operating activities from continuing operations 3,902 4,028
Net cash provided by operating activities from discontinued operations 0 559
Net cash provided by operating activities 3,902 4,587
Cash flows from investing activities:    
Acquisition of fixed assets (5,211) (1,023)
Proceeds from sale of fixed assets 0 100
Net cash used in investing activities from continuing operations (5,211) (923)
Net cash used in investing activities from discontinued operations 0 (258)
Net cash used in investing activities (5,211) (1,181)
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 (731) (873)
Payments on notes payable and finance leases from related parties (1,200) (669)
Payment of debt issuance costs (108) 0
Net cash used in financing activities from continuing operations (2,039) (542)
Net cash used in financing activities from discontinued operations 0 (58)
Net cash used in financing activities (2,039) (600)
Effect of exchange rate changes on cash 18 54
Net increase (decrease) in cash and cash equivalents (3,330) 2,860
Cash and cash equivalents, beginning of period 11,451 910
Cash and cash equivalents, end of period $ 8,121 $ 3,770