Note 4 - Warrants and Equity - Warrant Activity (Details)	9 Months Ended
	Sep. 30, 2025 $ / shares shares
Liability Classified Warrants [Member]
Balance, number of shares under warrants (in shares) | shares	0
Granted, number of shares under warrants (in shares) | shares	113,104,864
Exercised, number of shares under warrants (in shares) | shares	(19,212,408)
Balance, number of shares under warrants (in shares) | shares	93,892,456
Balance, weighted average remaining contractual life (Year)	5 years
Vested and Exercisable, number of shares under warrants (in shares) | shares	93,892,456
Vested and Exercisable, weighted average remaining contractual life (Year)	5 years
Liability Classified Warrants [Member] | Minimum [Member]
Balance, warrant exercise price (in dollars per share)	$ 0
Granted, warrant exercise price (in dollars per share)	0.37
Exercised, warrant exercise price (in dollars per share)	0.37
Balance, warrant exercise price (in dollars per share)	0.37
Vested and Exercisable, warrant exercise price (in dollars per share)	0.37
Liability Classified Warrants [Member] | Maximum [Member]
Balance, warrant exercise price (in dollars per share)	0
Granted, warrant exercise price (in dollars per share)	0.55
Exercised, warrant exercise price (in dollars per share)	0.37
Balance, warrant exercise price (in dollars per share)	0.55
Vested and Exercisable, warrant exercise price (in dollars per share)	0.55
Liability Classified Warrants [Member] | Weighted Average [Member]
Balance, warrant exercise price (in dollars per share)	0
Granted, warrant exercise price (in dollars per share)	0.47
Exercised, warrant exercise price (in dollars per share)	0.37
Balance, warrant exercise price (in dollars per share)	0.49
Vested and Exercisable, warrant exercise price (in dollars per share)	$ 0.49
Equity Classified Warrants [Member]
Balance, number of shares under warrants (in shares) | shares	7,810,033
Balance, warrant exercise price (in dollars per share)
Granted, number of shares under warrants (in shares) | shares	19,966,089
Exercised, number of shares under warrants (in shares) | shares	(7,477,570)
Balance, number of shares under warrants (in shares) | shares	20,230,882
Balance, warrant exercise price (in dollars per share)	$ 0.43
Vested and Exercisable, number of shares under warrants (in shares) | shares	18,976,140
Expired warrants, number of shares under warrants (in shares) | shares	(67,670)
Equity Classified Warrants [Member] | Minimum [Member]
Balance, warrant exercise price (in dollars per share)	$ 0
Granted, warrant exercise price (in dollars per share)	0.43
Exercised, warrant exercise price (in dollars per share)	0
Balance, warrant exercise price (in dollars per share)	0
Vested and Exercisable, warrant exercise price (in dollars per share)	0.75
Expired warrants, warrant exercise price (in dollars per share)	94.5
Equity Classified Warrants [Member] | Maximum [Member]
Balance, warrant exercise price (in dollars per share)	0
Granted, warrant exercise price (in dollars per share)	1.64
Exercised, warrant exercise price (in dollars per share)	2.23
Balance, warrant exercise price (in dollars per share)	0.55
Vested and Exercisable, warrant exercise price (in dollars per share)	54.45
Expired warrants, warrant exercise price (in dollars per share)	$ 94.5