Note 5 - Revenues (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 03, 2014
Number of Suspended Saltwater Injection Wells	2		2						2
Revenue from Contract with Customer, Excluding Assessed Tax	$ 24,296	$ 25,746	$ 62,852	$ 62,067
Number of Golf Courses	4
Accounts Receivable, Allowance for Credit Loss	$ 400		400		$ 200
Contract with Customer, Asset, after Allowance for Credit Loss	776	$ 814	776	$ 814	541	$ 988	$ 1,037	$ 582
Contract with Customer, Liability	$ 4,600		4,600		3,500
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers	0
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage	12.00%	24.00%
Waste Management Services [Member]
Accounts Receivable, after Allowance for Credit Loss	$ 8,700		$ 8,700		8,800
Waste Management Services [Member] | Maximum [Member]
Contract Term (Year)	1 year
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	46.00%	50.00%	52.00%	52.00%
Number of Major Customers	0		0	0
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers	1	2
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage	14.00%	26.00%
Golf and Related Operations [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 13,198	$ 12,828	$ 30,132	$ 29,729
Number of Golf Courses	4
Membership Agreement, Term	1 year
Accounts Receivable, after Allowance for Credit Loss	$ 1,500		$ 1,500		$ 1,000
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	54.00%	50.00%	48.00%	48.00%
Number of Major Customers			0	0
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers	0				0
Salt Water Injection Wells [Member] | Waste Management Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 0	$ 0	$ 0	$ 0
Customer Advance Deposits [Member]
Contract with Customer, Liability	$ 1,498	$ 1,473	$ 1,498	$ 1,473	$ 1,688	$ 1,656	$ 1,649	$ 1,565