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, authorized (in shares)	500,000,000	500,000,000
Common stock, issued (in shares)	89,132,183	80,752,290
Common stock, outstanding (in shares)	89,132,183	80,752,290