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Note 3 - Property and Equipment - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment, Net $ 24,802 $ 24,897
Manufacturing Equipment [Member]    
Property, Plant and Equipment, Net 1,885 2,104
Winnebago Building [Member]    
Property, Plant and Equipment, Net 20,724 20,643
Property, Plant and Equipment, Other Types [Member]    
Property, Plant and Equipment, Net $ 2,193 $ 2,150