Note 8 - Stockholders' Equity - Schedule of Restricted Stock (Details) - Restricted Stock [Member]	3 Months Ended
	Mar. 31, 2022 $ / shares shares
Non-vested, Shares (in shares)	96,557
Non-vested, Weighted Average Grant-Date Fair Value per Award (in dollars per share) | $ / shares	$ 2.33
Granted, Shares (in shares)	75,758
Granted, Weighted Average Grant-Date Fair Value per Award (in dollars per share) | $ / shares	$ 1.32
Vested, Shares (in shares)	0
Cancelled, Shares (in shares)	(41,499)
Non-vested, Shares (in shares)	130,816
Non-vested, Weighted Average Grant-Date Fair Value per Award (in dollars per share) | $ / shares	$ 1.90