Note 9 - Equity, Share-based Compensation and Warrants - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Apr. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Nonvested, shares issued (in shares)	1,401,282	1,401,282	1,266,033
Nonvested, unrecognized stock compensation	$ (592)	$ (592)	$ (658)
Nonvested (Year)		10 months 24 days	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)		(94,535)	(10,000)
Forfeited, unrecognized stock compensation		$ 55	$ 7
Forfeited (Year)		0 years	8 months 12 days
Vested with Service, shares issued (in shares)		(344,040)	(224,751)
Vested with Service (Year)		0 years	0 years
Expensed, unrecognized stock compensation		$ 125	$ 212
Before modification, shares issued (in shares)	(114,680)	(114,680)
Before modification, unrecognized stock compensation		$ 125
After modification, shares issued (in shares)		114,680
After modification, unrecognized stock compensation		$ (60)
Forfeited (Year)		0 years	8 months 12 days
Nonvested, shares issued (in shares)		962,707	1,401,282	1,266,033
Nonvested, unrecognized stock compensation		$ (347)	$ (592)	$ (658)
Vested at December 31, 2021 (in shares)	865,052	865,052	865,052
Vested with Service (in shares)		344,040	224,751
Issued at Vesting (in shares)			(224,751)
Issued at Termination of Service (in shares)		(483,879)
Vested at March 31, 2022 (in shares)		725,213	865,052	865,052