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Note 18 - Business Segments - Geographic Information about Property, Plant and Equipment Associated with Particular Regions (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Property, Plant and Equipment, Net $ 8,997 $ 8,565
North America [Member]    
Property, Plant and Equipment, Net 8,777 8,113
Europe [Member]    
Property, Plant and Equipment, Net 174 397
Asia Pacific [Member]    
Property, Plant and Equipment, Net $ 46 $ 55