Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2022	Dec. 31, 2021
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	325,000,000	325,000,000
Common stock, shares issued (in shares)	157,884,024	82,259,739
Common stock, shares outstanding (in shares)	157,530,961	81,906,676
Treasury stock, shares (in shares)	353,063	353,063