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Note 5 - Intangible Assets (Details Textual)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) 4 years 4 years 7 months 6 days
Minimum [Member]    
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) 1 year  
Maximum [Member]    
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) 6 years