Note 3 - Fair Value Measurements - Estimated Fair Value Assumptions (Details)	Mar. 31, 2022
Measurement Input, Expected Term [Member]
Measurement Input	0.25
Measurement Input, Price Volatility [Member]
Measurement Input	112
Measurement Input, Discount Rate [Member]
Measurement Input	1.46
Measurement Input, Expected Dividend Rate [Member]
Measurement Input	0.00
Measurement Input, Share Price [Member]
Measurement Input	1.93
Measurement Input, Exercise Price [Member]
Measurement Input	0.0001