Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net income	$ 4,599	$ 125
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,146	7,878
Stock-based compensation expense	1,166	2,082
Bad debt expense	102	0
Gain on disposal of assets	(761)	(1,223)
Income from equity investment in joint venture	(1,770)	(1,897)
Distributions from equity investment in joint venture	1,716	1,225
Cash settlements from natural gas derivatives, net	(359)	0
Realized and unrealized losses from natural gas derivatives, net	152	572
Changes in operating assets and liabilities:
Accounts receivable	1,390	4,019
Prepaid expenses and other current assets	820	1,461
Accounts payable and accrued liabilities	(678)	(7,717)
Other	170	187
Net cash provided by operating activities	13,693	6,712
Cash flows from investing activities:
Acquisition of fixed assets	(9,146)	(10,252)
Proceeds from sale of fixed assets	841	1,255
Proceeds from notes receivable, related to prior sale of Brazil	185	87
Net cash used in investing activities	(8,120)	(8,910)
Cash flows from financing activities:
Payments on short- and long-term notes payable and finance leases	(1,905)	(1,179)
Payments on notes payable from related parties	0	(2,435)
Payment of debt issuance costs	0	(108)
Employee tax payments from restricted stock withholdings	(9)	(162)
Net cash used in financing activities	(1,914)	(3,884)
Effect of exchange rate changes on cash	(46)	5
Net increase (decrease) in cash and cash equivalents	3,613	(6,077)
Cash and cash equivalents, beginning of year	5,374	11,451
Cash and cash equivalents, end of year	$ 8,987	$ 5,374