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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net income (loss) from continuing operations $ 1,084 $ (359)
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by operating activities:    
Depreciation 2,011 2,277
Stock-based compensation expense 589 531
Income from equity investment in joint venture (393) (161)
Realized and unrealized losses on natural gas derivatives 421 0
Changes in operating assets and liabilities:    
Accounts receivable 2,044 1,672
Prepaid expenses and other current assets 507 342
Accounts payable and accrued liabilities (6,361) (1,684)
Other 191 (156)
Net cash provided by operating activities from continuing operations 93 2,462
Net cash provided by operating activities from discontinued operations 0 693
Net cash provided by operating activities 93 3,155
Cash flows from investing activities:    
Acquisition of fixed assets (3,727) (690)
Proceeds from sale of fixed assets 0 100
Net cash used in investing activities from continuing operations (3,727) (590)
Net cash used in investing activities from discontinued operations 0 (228)
Net cash used in investing activities (3,727) (818)
Cash flows from financing activities:    
Payments on short- and long-term notes payable (365) (414)
Payments on notes payable and finance leases from related parties (596) (669)
Net cash used in financing activities from continuing operations (961) (1,083)
Net cash used in financing activities from discontinued operations 0 (49)
Net cash used in financing activities (961) (1,132)
Effect of exchange rate changes on cash 5 (3)
Net increase (decrease) in cash and cash equivalents (4,590) 1,202
Cash and cash equivalents, beginning of period 11,451 910
Cash and cash equivalents, end of period $ 6,861 $ 2,112