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Note 4 - Property and Equipment - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Property, Plant and Equipment, Net $ 27,276 $ 28,307
Manufacturing Equipment [Member]    
Property, Plant and Equipment, Net 3,183 3,796
Winnebago Building [Member]    
Property, Plant and Equipment, Net 21,417 21,587
Property, Plant and Equipment, Other Types [Member]    
Property, Plant and Equipment, Net $ 2,676 $ 2,924