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Note 14 - Business Acquisition - Identifiable Intangible Assets Acquired (Details) - USD ($)
3 Months Ended
Sep. 30, 2019
Jul. 01, 2019
Dec. 31, 2018
Goodwill, Ending Balance $ 164,774,000   $ 159,791,000
Asset Purchase Agreement [Member]      
Goodwill, Ending Balance 4,983,000 $ 4,983,000  
Intangible assets, net 9,683,000    
Asset Purchase Agreement [Member] | Trade Name and Trademarks [Member]      
Intangible assets, net $ 300,000    
Intangible assets, Weighted Average Amortization Period (Year) 4 years    
Asset Purchase Agreement [Member] | Developed Technology Rights [Member]      
Intangible assets, net $ 2,100,000    
Intangible assets, Weighted Average Amortization Period (Year) 4 years    
Asset Purchase Agreement [Member] | Customer Relationships [Member]      
Intangible assets, net $ 2,300,000    
Intangible assets, Weighted Average Amortization Period (Year) 6 years