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Note 12 - Preferred Stock (Details Textual)
$ / shares in Thousands
 6 Months Ended
Aug. 19, 2021
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
shares
Dec. 31, 2021
$ / shares
Stock Issued During Period, Shares, New Issues (in shares) | shares   153 446  
Stock Issued During Period, Value, New Issues   $ 0 $ 0  
Preferred Stock, No Par Value (in dollars per share) | $ / shares   $ 0   $ 0
Series A Preferred Stock [Member]        
Preferred Stock, Dividend Rate, Percentage 5.25%      
Preferred Stock, No Par Value (in dollars per share) | $ / shares $ 0      
Preferred Stock, Liquidation Preference, Value $ 1,000      
Series A Preferred Stock [Member] | Underwritten Public Offering [Member]        
Stock Issued During Period, Shares, New Issues (in shares) | shares 115,000      
Stock Issued During Period, Value, New Issues $ 115,000,000.0      
Depositary Shares, Interest in Preferred Stock 0.025      
Proceeds from Issuance of Preferred Stock and Preference Stock $ 110,900,000