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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net income (loss) from continuing operations $ 125 $ (1,192)
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by operating activities:    
Depreciation 7,878 8,664
Stock-based compensation expense 2,082 2,348
Gain on disposal of assets (1,223) (34)
Income from equity investment in joint venture (1,897) (1,881)
Distributions from equity investment in joint venture 1,225 1,550
Cash settlements from natural gas derivatives, net 0 (1,037)
Realized and unrealized losses from natural gas derivatives, net 572 465
Changes in operating assets and liabilities:    
Accounts receivable 4,019 (7,013)
Inventories 36 73
Prepaid expenses and other current assets 1,425 1,395
Accounts payable and accrued liabilities (7,717) 10,554
Other 187 (256)
Net cash provided by operating activities from continuing operations 6,712 13,636
Net cash provided by operating activities from discontinued operations 0 1,061
Net cash provided by operating activities 6,712 14,697
Cash flows from investing activities:    
Acquisition of fixed assets (10,252) (3,932)
Proceeds from sale of fixed assets 1,255 100
Proceeds from sale of assets held for sale 0 2,049
Proceeds from sale of the Brazil operations 87 200
Net cash used in investing activities from continuing operations (8,910) (1,583)
Net cash used in investing activities from discontinued operations 0 (334)
Net cash used in investing activities (8,910) (1,917)
Cash flows from financing activities:    
Proceeds received from borrowings on notes payable 0 1,000
Payments on notes payable (1,179) (1,800)
Payments on notes payable and finance leases from related parties (2,435) (1,255)
Payments of debt issuance costs (108) 0
Employee tax payments from restricted stock withholdings (162) (85)
Net cash used in financing activities from continuing operations (3,884) (2,140)
Net cash used in financing activities from discontinued operations 0 (113)
Net cash used in financing activities (3,884) (2,253)
Effect of exchange rate changes on cash 5 14
Net increase (decrease) in cash and cash equivalents (6,077) 10,541
Cash and cash equivalents, beginning of year 11,451 910
Cash and cash equivalents, end of year $ 5,374 $ 11,451