Note 13 - Equity Incentive Plans - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Stock options, outstanding (in shares)	222,700	0
Stock options, granted (in shares)	226,746	222,700
Stock options, weighted average exercise price, granted (in dollars per share)	$ 3.18	$ 7.45
Granted		$ 3,094
Stock options, intrinsic value, outstanding	$ 0	$ 3,094
Stock options, outstanding, weighted average remaining contractual term (Year)	8 years 10 months 24 days	9 years 8 months 12 days
Stock options, expired (in shares)	0
Stock options, forfeited (in shares)	(23,800)
Stock options, weighted average exercise price, forfeited (in dollars per share)	$ 7.45
Stock options, outstanding (in shares)	425,646	222,700
Stock options, weighted average exercise price, outstanding (in dollars per share)	$ 5.17	$ 7.45
Stock options, exercisable (in shares)	150,495
Stock options, weighted average exercise price, exercisable (in dollars per share)	$ 5.81
Stock options, aggregate intrinsic value, exercisable	$ 0
Stock options, exercisable, weighted average remaining contractual term (Year)	8 years 10 months 24 days