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Note 11 - Business Acquisition - Identifiable Intangible Assets Acquired (Details) - USD ($)
Jul. 01, 2019
Mar. 31, 2020
Dec. 31, 2019
Goodwill, Ending Balance   $ 164,774,000 $ 164,774,000
Asset Purchase Agreement [Member]      
Goodwill, Ending Balance $ 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