Note 12 - Common Stock - Assumptions (Details) - Warrant [Member]	Apr. 15, 2020	Apr. 14, 2020
Measurement Input, Exercise Price [Member]
Warrants and Rights Outstanding, Measurement Input	6.1	15.5
Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input	6.3	6.3
Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input	2.8	2.8
Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	0.97	0.97
Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.0027	0.0027
Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0	0