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Note 4 - Fair Value Measurements - Estimated Fair Value Assumptions (Details) - January 2022 Warrants [Member]
Dec. 31, 2022
Measurement Input, Expected Term [Member]  
Measurement Input 1.9
Measurement Input, Price Volatility [Member]  
Measurement Input 0.499
Measurement Input, Risk Free Interest Rate [Member]  
Measurement Input 0.0448
Measurement Input, Expected Dividend Rate [Member]  
Measurement Input 0.0000
Measurement Input, Share Price [Member]  
Measurement Input 1.25
Measurement Input, Exercise Price [Member]  
Measurement Input 0.7949