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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net loss $ (2,574) $ (829)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 4,585 4,443
Stock-based compensation expense 1,139 284
Bad debt expense 17 0
Gain on disposal of fixed assets (80) (24)
Gain on extinguishment of debt 0 (1,086)
Income from equity investment in joint venture (921) (959)
Change in unrealized loss on natural gas derivatives 899 0
Distributions from equity investment in joint venture 1,550 1,387
Change in operating assets and liabilities:    
Accounts receivable (376) (1,428)
Due to related parties 0 42
Inventories 98 92
Prepaid expenses and other current assets (1,855) (453)
Accounts payable and accrued liabilities 669 1,150
Other 521 (8)
Net cash provided by operating activities 3,672 2,611
Cash flows from investing activities:    
Acquisition of fixed assets (1,245) (5,917)
Proceeds on sales of fixed assets 100 258
Net cash used in investing activities (1,145) (5,659)
Cash flows from financing activities:    
Proceeds from borrowings on short- and long-term notes payable 1,000 7,087
Payments on short- and long-term notes payable (949) (448)
Payments on notes payable and finance leases from related parties (669) (1,701)
Payment of debt issuance costs 0 (420)
Net cash provided by (used in) financing activities (618) 4,518
Effect of exchange rate changes on cash 84 29
Net increase in cash and cash equivalents 1,993 1,499
Cash and cash equivalents, beginning of period 2,060 1,814
Cash and cash equivalents, end of period 4,053 3,313
Supplemental disclosure of cash flow information:    
Interest paid 296 380
Income taxes paid 12 169
Non-cash investing and financing activities:    
Common stock issued to acquire fixed assets 0 3,795
Equipment acquired from issuance of note payable 359 0
Acquisition of fixed assets included within accounts payable 170 0
Fixed assets transferred to assets held for sale 1,841 0
Equipment acquired under capital leases $ 0 $ 104