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Note 15 - Acquisition (Details Textual)
$ / shares in Units, € in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
Mar. 01, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
Mar. 31, 2021
EUR (€)
Mar. 01, 2021
EUR (€)
Feb. 04, 2021
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.001 $ 0.001 $ 0.001     $ 0.001 $ 0.001
Business Combination, Consideration, Liability, Current | $ $ 2,006   $ 2,006      
Woorank SRL ([Member]              
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   $ 723     € 600    
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares   29,433          
Business Combination, Consideration, Liability, Current | €       € 550      
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $     $ 153        
Woorank SRL ([Member] | Acquired Software [Member]              
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) 5 years            
Woorank SRL ([Member] | Customer Relationships [Member]              
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) 8 years            
Woorank SRL ([Member] | Domain And Trade Names [Member]              
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) 12 years            
Woorank SRL ([Member] | Minimum [Member]              
Business Combination, Contingent Consideration, Shares Issuable, Price Per Share (in dollars per share) | $ / shares   $ 3.38