Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2025	Dec. 31, 2024
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	190,000,000	175,000,000
Common stock, issued (in shares)	158,736,286	156,204,159
Common stock, outstanding (in shares)	158,168,688	155,836,256
Treasury stock, shares (in shares)	567,598	367,903