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Note 5 - Property, Plant and Equipment, Net (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Depreciation, Depletion and Amortization, Nonproduction, Total $ 8,132 $ 8,272 $ 7,906
Property, Plant and Equipment [Member]      
Depreciation, Depletion and Amortization, Nonproduction, Total $ 4,300 $ 4,500 $ 4,100