Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2023	Dec. 31, 2022
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	50,000,000	20,000,000
Common stock, shares issued (in shares)	10,053,544	8,481,848
Common stock, shares outstanding (in shares)	10,053,544	8,481,848
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred Stock, Shares Outstanding (in shares)	0	0