Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	250,000,000	100,000,000
Common stock, shares issued (in shares)	73,562,648	59,844,850
Common stock, shares outstanding (in shares)	73,562,648	59,844,850