Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 1,099	$ 384	$ 1,997	$ 1,370
Adjustments to reconcile net income to net cash provided by continuing operating      activities:
Depreciation, depletion and amortization			8,557	8,696
Deferred income taxes			(57)	133
Equity in loss of joint ventures	2,913	1,878	10,585	5,248
Gain on sale of equipment and property			(14)	(901)
Stock-based compensation	271	276	1,472	1,302
Net changes in operating assets and liabilities:
Accounts receivable			(517)	(737)
Deferred costs and other assets			(538)	(2,160)
Accounts payable and accrued liabilities			(1,512)	(1,440)
Income taxes payable and receivable			686	1,559
Other long-term liabilities			62	105
Net cash provided by operating activities			20,721	13,175
Cash flows from investing activities:
Investments in properties	(2,449)	(8,726)	(4,634)	(26,137)
Investments in joint ventures			(31,648)	(20,838)
Return of capital from investments in joint ventures			7,559	13,327
Proceeds from sales of investments available for sale			0	4,317
Proceeds from the sale of assets			16	952
Cash held in escrow			151	170
Net cash used in investing activities			(28,556)	(28,209)
Cash flows from financing activities:
Distribution to noncontrolling interest			(2,437)	(1,937)
Repurchase of company stock			(2,000)	0
Exercise of employee stock options			803	233
Net cash used in financing activities			(3,634)	(1,704)
Net decrease in cash and cash equivalents			(11,469)	(16,738)
Cash and cash equivalents at beginning of year			177,497	161,521	$ 161,521
Cash and cash equivalents at end of the period	$ 166,028	$ 144,783	166,028	144,783	$ 177,497
Supplemental disclosure of cash flow information:
Interest			3,248	2,212
Income taxes			$ 622	$ (1,734)