Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Series B preferred stock, par value (in dollars per share)	$ 0.25	$ 0.25
Series B preferred stock, shares issued (in shares)	157,776	157,776
Series B preferred stock, shares outstanding (in shares)	157,776	157,776
Series B preferred stock, liquidation preference	$ 7,889	$ 7,889
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	610,490,740	607,619,495
Treasury stock, shares (in shares)	8,229,212	8,132,553