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Note 13 - Fair Value (Tables)
 9 Months Ended
Sep. 30, 2024
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

(in thousands)

                        
   

Quoted Prices

                  
   

in Active

    

Significant

          
   

Markets for

    

Other

    

Significant

  
   

Identical

    

Observable

    

Unobservable

  
   

Assets

    

Inputs

    

Inputs

  
   

(Level 1)

    

(Level 2)

    

(Level 3)

  

September 30, 2024

                        

Mortgage-backed securities

   $ -     $ 5,442,804     $ -  

U.S. Treasury securities

     99,467       -       -  

Interest rate swaps

     -       14,678       -  

TBA securities

     -       2,168       -  

December 31, 2023

                        

Mortgage-backed securities

   $ -     $ 3,894,012     $ -  

U.S. Treasury securities

     148,820       -       -  

Interest rate swaps

     -       6,348       -  

Interest rate swaptions

     -       72       -  

TBA securities

     -       (12,694 )     -