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Note 13 - Acquisition (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Feb. 01, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Combination, Acquisition Related Costs   $ 0   $ 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          
Business Combination, Acquisition Related Costs       $ 1,100