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Note 8 - Shareholders' Equity - Fair Value Assumptions of Warrants (Details) - Minimum [Member]
Jun. 30, 2021
Measurement Input, Weighted Average Exercise Price [Member]  
Warrants and Rights Outstanding, Measurement Input 3.74
Measurement Input, Risk Free Interest Rate [Member]  
Warrants and Rights Outstanding, Measurement Input 0.39
Measurement Input, Price Volatility [Member]  
Warrants and Rights Outstanding, Measurement Input 103.42
Measurement Input, Expected Term [Member]  
Warrants and Rights Outstanding, Measurement Input 2.8