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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
shares in Thousands
Jun. 30, 2023
Dec. 31, 2022
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 480,000 480,000
Common stock, shares issued (in shares) 157,500 143,500
Common stock, shares outstanding (in shares) 157,500 143,500
Treasury stock, common shares (in shares) 1,003,174 991,089
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 500 500
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Series A Convertible Preferred Stock [Member]    
Temporary equity, liquidation preference (in dollars per share) $ 1,000 $ 1,000
Temporary equity, shares issued (in shares) 87,978 82,948
Temporary equity, shares outstanding (in shares) 87,978 82,948
Series B Convertible Preferred Stock [Member]    
Temporary equity, liquidation preference (in dollars per share) $ 1,000 $ 1,000
Temporary equity, shares issued (in shares) 84,037 79,239
Temporary equity, shares outstanding (in shares) 84,037 79,239
Series C Convertible Preferred Stock [Member]    
Temporary equity, liquidation preference (in dollars per share) $ 1,000 $ 1,000
Temporary equity, shares issued (in shares) 62,959 59,366
Temporary equity, shares outstanding (in shares) 62,959 59,366