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Note 15 - Stockholders' Equity - Dividends Declared (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Common Shares (in dollars per share) $ 0.23000 $ 0.20000 $ 0.46000 $ 0.39000
Series L Preferred Stock [Member]        
Preferred Shares (in dollars per share) 0.32031 0.32031 0.64062 0.64062
Series M Preferred Stock [Member]        
Preferred Shares (in dollars per share) $ 0.32813 $ 0.32813 $ 0.65626 $ 0.65626