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Note 6 - Restructuring and Other Exit Costs (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Asset Impairment Charges, Total $ 0 $ 460 $ 0 $ 1,401  
Restructuring Charges, Total 319 914 1,895 914  
Restructuring Reserve, Ending Balance 608   608   $ 368
Facility Closing [Member]          
Restructuring Charges, Total $ 0 $ 460 $ 0 460  
In Process Research and Development [Member]          
Impairment of Intangible Assets (Excluding Goodwill), Total       $ 900