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Note 6 - Acquired Intangible Assets, Net (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amortization of Intangible Assets, Total $ 1,000 $ 1,000 $ 1,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 900    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 900    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 1,000    
Impairment of Intangible Assets, Finite-lived 389
Finite-Lived Intangible Assets, Amortization Expense, Year Three 900    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 900    
Developed Technology Rights [Member]      
Impairment of Intangible Assets, Finite-lived 389    
Selling, General and Administrative Expenses [Member]      
Impairment of Intangible Assets, Finite-lived 400    
Selling, General and Administrative Expenses [Member] | Developed Technology Rights [Member]      
Impairment of Intangible Assets, Finite-lived $ 300