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Note 13 - Acquisition (Details Textual)
3 Months Ended 9 Months Ended
Feb. 01, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Business Combination, Acquisition Related Costs   $ 1,089,000
Revenue from Contract with Customer, Including Assessed Tax   47,808,000 35,684,000 139,758,000 110,623,000
Net Income (Loss) Attributable to Parent, Total   $ 4,134,000 $ 1,695,000 9,901,000 $ 6,495,000
Dielectrics [Member]          
Lessee, Operating Lease, Term of Contract 5 years        
Number of Lease Term Options 2        
Dielectrics [Member]          
Business Acquisition, Percentage of Voting Interests Acquired 100.00%        
Payments to Acquire Businesses, Gross $ 80,000,000        
Business Combination, Consideration Transferred, Working Capital Adjustment $ 250,000        
Business Combination, Acquisition Related Costs       1,100,000  
Revenue from Contract with Customer, Including Assessed Tax       25,100,000  
Net Income (Loss) Attributable to Parent, Total       $ 4,400,000