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Note 6 - Assets Held for Sale (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
ft²
Gain (Loss) on Disposition of Property Plant Equipment, Total   $ 1,174 $ (0)  
Facility in Maple Plain, Minnesota [Member]        
Area of Real Estate Property (Square Foot) | ft²       35,000
Assets Held-for-sale, Not Part of Disposal Group, Total       $ 2,000
Proceeds from Sale of Property, Plant, and Equipment, Total $ 3,200      
Facility in Maple Plain, Minnesota [Member] | General and Administrative Expense [Member]        
Gain (Loss) on Disposition of Property Plant Equipment, Total $ 1,200