Note 6 - Stockholders' Equity - Schedule of Restricted Stock (Details) - Restricted Stock [Member]	3 Months Ended
	Mar. 31, 2023 $ / shares shares
Non-vested as January 1, 2023 (in shares)	435,293
Non-vested as January 1, 2023 (in dollars per share) | $ / shares	$ 1.18
Granted, Shares (in shares)	0
Granted, Weighted Average Grant-Date Fair Value per Award (in dollars per share) | $ / shares	$ 0
Vested, Shares (in shares)	(192,835)
Vested, Weighted Average Grant-Date Fair Value per Award (in dollars per share) | $ / shares	$ 0
Cancelled, , Weighted Average Grant-Date Fair Value per Award (in shares)	0
Non-vested as March 31, 2023 (in shares)	242,458
Non-vested as March 31, 2023 (in dollars per share) | $ / shares	$ 1.33