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Note 14 - Discontinued Operations (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
May 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent, Total   $ 0 $ (140)
PUC-regulated Assets of Kapalua Water Company, Ltd and Kapalua Waste Treatment Company, Ltd [Member]      
Proceeds from Sale of Productive Assets, Total $ 4,200    
PUC-regulated Assets of Kapalua Water Company, Ltd and Kapalua Waste Treatment Company, Ltd [Member] | Discontinued Operations, Disposed of by Sale [Member]      
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent, Total   $ (100)