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Note 4 - Reportable Segments (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

		Year Ended December 31, 2023
(in thousands)		Land and Water Resources				Water Filtration Technology				Total
Total revenues			1,251				740				1,991
Costs and expenses:
Cost of sales			2,241				646				2,887
General and administrative			18,042				755				18,797
Depreciation			1,096				151				1,247
Total costs and expenses			21,379				1,552				22,931
Operating loss		$	(20,128	)		$	(812	)		$	(20,940	)

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

		December 31, 2023				December 31, 2022
Operating Segment:
Water and Land Resources		$	101,946			$	107,439
Water Filtration Technology			5,428				3,348
		$	107,374			$	110,787

Schedule of Goodwill [Table Text Block]

		December 31, 2023				December 31, 2022
Operating Segment:
Water and Land Resources		$	3,813			$	3,813
Water Filtration Technology			1,901				1,901
		$	5,714			$	5,714

Property, Plant and Equipment [Table Text Block]

		December 31, 2023
		Water and Land Resources				Water Filtration Technology
Land and land improvements		$	32,357			$	-
Water programs			29,209				-
Pipeline			22,096				-
Buildings			1,730				-
Leasehold improvements, furniture and fixtures			1,605				4
Machinery and equipment			3,719				210
Construction in progress			5,664				-
			96,380				214
Less accumulated depreciation			(9,238	)			(139	)
		$	87,142			$	75

		December 31, 2022
		Water and Land Resources				Water Filtration Technology
Land and land improvements		$	30,579			$	-
Water programs			29,210				-
Pipeline			22,091				-
Buildings			1,715				-
Leasehold improvements, furniture and fixtures			1,606				3
Machinery and equipment			3,229				166
Construction in progress			3,680				-
			92,110				169
Less accumulated depreciation			(8,141	)			-
		$	83,969			$	169

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