Note 2 - Reportable Segments - Property, Plant, Equipment and Water Programs (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Property, plant, and equipment, net	$ 87,034	$ 87,217
Water and Land Resources [Member]
Property, plant, and equipment	96,750	96,380
Less accumulated depreciation	(9,811)	(9,238)
Property, plant, and equipment, net	86,939	87,142
Water Treatment [Member]
Property, plant, and equipment	255	214
Less accumulated depreciation	(160)	(139)
Property, plant, and equipment, net	95	75
Land and Land Improvements [Member] | Water and Land Resources [Member]
Property, plant, and equipment	33,004	32,357
Land and Land Improvements [Member] | Water Treatment [Member]
Property, plant, and equipment	0	0
Water Programs [Member] | Water and Land Resources [Member]
Property, plant, and equipment	29,321	29,209
Water Programs [Member] | Water Treatment [Member]
Property, plant, and equipment	0	0
Pipelines [Member] | Water and Land Resources [Member]
Property, plant, and equipment	22,098	22,096
Pipelines [Member] | Water Treatment [Member]
Property, plant, and equipment	0	0
Building [Member] | Water and Land Resources [Member]
Property, plant, and equipment	1,805	1,730
Building [Member] | Water Treatment [Member]
Property, plant, and equipment	0	0
Leasehold Improvements, Furniture, Fixtures [Member] | Water and Land Resources [Member]
Property, plant, and equipment	1,605	1,605
Leasehold Improvements, Furniture, Fixtures [Member] | Water Treatment [Member]
Property, plant, and equipment	4	4
Machinery and Equipment [Member] | Water and Land Resources [Member]
Property, plant, and equipment	3,826	3,719
Machinery and Equipment [Member] | Water Treatment [Member]
Property, plant, and equipment	247	210
Construction in Progress [Member] | Water and Land Resources [Member]
Property, plant, and equipment	5,091	5,664
Construction in Progress [Member] | Water Treatment [Member]
Property, plant, and equipment	$ 4	$ 0