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Note 8 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Depreciation $ 2,200 $ 2,100 $ 6,500 $ 6,800    
Gain (Loss) on Disposition of Property Plant Equipment     3,819 $ 1,596    
Jersey City [Member]            
Asset, Held-for-Sale, Not Part of Disposal Group           $ 1,500
Gain (Loss) on Disposition of Property Plant Equipment     $ 3,800      
Jersey City [Member] | Disposal of Corporate Headquarters [Member]            
Disposal Group, Including Discontinued Operation, Consideration         $ 5,900