Note 5 - Intangible Assets (Details Textual)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)	5 years 292 days	6 years 182 days
Minimum [Member]
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)	2 years
Maximum [Member]
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)	7 years