Note 5 - Revenues (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 03, 2014
Number of Suspended Saltwater Injection Wells	2		2						2
Revenue from Contract with Customer, Excluding Assessed Tax	$ 25,746	$ 24,235	$ 62,067	$ 66,150
Accounts Receivable, Allowance for Credit Loss	300		300		$ 300
Contract with Customer, Asset, after Allowance for Credit Loss	814	$ 845	814	$ 845	582	$ 1,037	$ 1,110	$ 567
Contract with Customer, Liability	$ 4,600		$ 4,600		$ 3,500
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers	0	0	0	0
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage			22.00%		12.00%
Waste Management Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 12,918	$ 11,461	$ 32,338	$ 36,151
Accounts Receivable, after Allowance for Credit Loss	10,600		$ 10,600		$ 7,500
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			50.00%	47.00%
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers			1		1
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage			26.00%		14.00%
Golf and Related Operations [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	12,828	$ 12,774	$ 29,729	$ 29,999
Number of Golf Courses			4
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage			48.00%	45.00%
Membership Agreement, Term			1 year
Accounts Receivable, after Allowance for Credit Loss	$ 1,900		$ 1,900		$ 1,100
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	50.00%	53.00%
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers			0
Salt Water Injection Wells [Member] | Waste Management Services [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			$ 0	$ 0
Customer Advance Deposits [Member]
Contract with Customer, Liability	$ 1,473	$ 1,305	$ 1,473	$ 1,305	$ 1,565	$ 1,649	$ 1,311	$ 1,223