Note 8 - Stock Warrants - Assumptions (Details)	Dec. 31, 2021
Measurement Input, Exercise Price [Member] \| Minimum [Member]
Warrant assumptions	0.90
Measurement Input, Exercise Price [Member] \| Maximum [Member]
Warrant assumptions	1.00
Measurement Input, Expected Dividend Rate [Member]
Warrant assumptions	0
Measurement Input, Price Volatility [Member] \| Minimum [Member]
Warrant assumptions	0.59
Measurement Input, Price Volatility [Member] \| Maximum [Member]
Warrant assumptions	0.60
Measurement Input, Risk Free Interest Rate [Member] \| Minimum [Member]
Warrant assumptions	0.020
Measurement Input, Risk Free Interest Rate [Member] \| Maximum [Member]
Warrant assumptions	0.021
Measurement Input, Expected Term [Member]
Warrant assumptions	1