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Note 13 - Fair Value (Tables)
12 Months Ended
Dec. 31, 2023
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)

 

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)  - 

December 31, 2022

            

Mortgage-backed securities

 $-  $3,540,002  $- 

U.S. Treasury securities

  36,382   -   - 

Interest rate swaps

  -   4,983   - 

Interest rate swaptions

  -   27,416   - 

Interest rate caps

  -   1,119   - 

TBA securities

  -   (507)  -