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Note 22 - Acquisition (Details Textual)
3 Months Ended 12 Months Ended
Feb. 01, 2018
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Combination, Acquisition Related Costs                   $ 1,089,000
Revenue from Contract with Customer, Including Assessed Tax   $ 50,697,000 $ 47,808,000 $ 49,019,000 $ 42,931,000 $ 37,220,000 $ 35,684,000 $ 37,886,000 $ 37,053,000 190,455,000 147,843,000 146,132,000
Net Income (Loss) Attributable to Parent, Total                   14,311,000 $ 9,210,000 $ 7,970,000
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                   36,200,000    
Net Income (Loss) Attributable to Parent, Total                   $ 6,300,000