Note 13 - Stock Based Compensation - Summary of Restricted Stock (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Effect of reverse stock split (in shares)	(381,945)
Restricted Stock [Member]
Outstanding (in shares)	416,666	429,597
Outstanding, weighted average grant date fair value (in dollars per share)	$ 0.60	$ 0.61
Vested (in shares)	0	(12,931)
Vested, weighted average grant date fair value (in dollars per share)		$ 1.16
Outstanding (in shares)	34,721	416,666
Outstanding, weighted average grant date fair value (in dollars per share)	$ 7.20	$ 0.60