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Note 1 - Basis of Presentation (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disposal Group, Operating Expense $ 5,194 $ 0 $ 5,194 $ 0
Goodwill, Written Off     630  
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations [Member] | Manufacturing Facility in Japan [Member]        
Disposal Group, Operating Expense 5,200   5,200  
Disposal Group, Employee Severance, Operating Expense 2,200   2,200  
Disposal Group, Write-down of Fixed Assets, Operating Expense 1,200   1,200  
Disposal Group, Facility-related Charges, Operating Expense 900   900  
Goodwill, Written Off 600   600  
Disposal Group, Other Closure Related Charges, Operating Expense $ 300   $ 300