Note 10 - Equity, Share-based Compensation and Warrants - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Nonvested, shares issued (in shares)	1,266,033
Nonvested, unrecognized stock compensation	$ (658)
Nonvested (Year)	10 months 24 days	10 months 24 days
Granted, nonvested, shares issued (in shares)	370,000
Granted, unrecognized stock compensation	$ (153)
Granted (Year)	2 years
Forfeited, shares issued (in shares)	(10,000)
Forfeited, unrecognized stock compensation	$ 7
Forfeited (Year)	8 months 12 days
Vested, shares issued (in shares)	(224,751)
Vested (Year)	0 years
Expensed, unrecognized stock compensation	$ 212
Nonvested, shares issued (in shares)	1,401,282	1,266,033
Nonvested, unrecognized stock compensation	$ (592)	$ (658)