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Note 19 - Acquisition (Details Textual)
$ in Thousands
6 Months Ended 12 Months Ended
Feb. 01, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Combination, Acquisition Related Costs     $ 1,089
Dielectrics [Member]          
Business Acquisition, Percentage of Voting Interests Acquired 100.00%        
Payments to Acquire Businesses, Gross $ 80,000        
Business Combination, Consideration Transferred, Working Capital Adjustment $ 250        
Lessee, Operating Lease, Term of Contract 5 years        
Number of Lease Term Options 2        
Business Combination, Acquisition Related Costs   $ 1,100      
Lessee, Operating Lease, Renewal Term 5 years