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Note 4 - Property and Equipment - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment, Net $ 26,207 $ 25,171
Manufacturing Equipment [Member]    
Property, Plant and Equipment, Net 3,053 3,492
Winnebago Building [Member]    
Property, Plant and Equipment, Net 19,591 19,406
Property, Plant and Equipment, Other Types [Member]    
Property, Plant and Equipment, Net $ 3,563 $ 2,273