CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 492	$ 582	$ 898	$ 986
Adjustments to reconcile net income to net cash provided by continuing operating      activities:
Depreciation, depletion and amortization			5,724	5,890
Deferred income taxes			(57)	133
Equity in loss of joint ventures	4,047	1,766	7,672	3,370
Gain on sale of equipment and property			(15)	(733)
Stock-based compensation	877	829	1,201	1,026
Net changes in operating assets and liabilities:
Accounts receivable			(306)	(630)
Deferred costs and other assets			(278)	(1,294)
Accounts payable and accrued liabilities			(2,186)	(1,468)
Income taxes payable and receivable			168	1,501
Other long-term liabilities			32	26
Net cash provided by operating activities			12,853	8,807
Cash flows from investing activities:
Investments in properties	(979)	(13,775)	(2,185)	(17,411)
Investments in joint ventures			(26,634)	(4,261)
Return of capital from investments in joint ventures			6,897	6,677
Proceeds from sales of investments available for sale			0	4,317
Proceeds from the sale of assets			17	741
Cash held in escrow			(26)	(13)
Net cash used in investing activities			(21,931)	(9,950)
Cash flows from financing activities:
Distribution to noncontrolling interest			(1,685)	(1,349)
Repurchase of company stock			(1,000)	0
Exercise of employee stock options			803	233
Net cash used in financing activities			(1,882)	(1,116)
Net decrease in cash and cash equivalents			(10,960)	(2,259)
Cash and cash equivalents at beginning of year			177,497	161,521	$ 161,521
Cash and cash equivalents at end of the period	$ 166,537	$ 159,262	166,537	159,262	$ 177,497
Supplemental disclosure of cash flow information:
Interest			2,133	1,475
Income taxes			$ 530	$ (1,734)