Note 3 - Shareholders' Equity - Summary of Restricted Stock Activity (Details) - Restricted Stock [Member]	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Non-vested restricted stock (in shares) | shares	600,000
Non-vested restricted stock, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 0.26
Granted (in shares) | shares	0
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 0
Vested (in shares) | shares	0
Vested, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 0
Cancelled/expired (in shares) | shares	0
Cancelled/expired/rescinded, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 0
Non-vested restricted stock (in shares) | shares	600,000
Non-vested restricted stock, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 0.26
Non-vested restricted stock, weighted-average contractual life (Year)	9 years 1 month 6 days