Note 5 - Warrant Liabilities - Warrant Valuation Assumptions (Details)	Jun. 30, 2025	Dec. 31, 2024
Notes Warrants [Member] | Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input	0.86	1.31
Notes Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.039	0.042
Notes Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0	0
Notes Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input	2.12	2.61
Notes Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	1.173	1.059
Additional Warrants [Member] | Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input	0.86	1.31
Additional Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.039	0.043
Additional Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0	0
Additional Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input	2.62	3.12
Additional Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	1.127	0.996