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Note 3 - Property, Plant, Equipment and Water Programs (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Depreciation, Total $ 206 $ 175
Pipelines [Member]    
Property, Plant and Equipment, Useful Life (Year) 30 years  
Depreciation, Total $ 206