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Note 13 - Fair Value (Tables)
9 Months Ended
Sep. 30, 2025
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, 2025

            

Mortgage-backed securities

 $-  $8,356,080  $- 

U.S. Treasury securities

  125,440   -   - 

Interest rate swaps

  -   (2,267)  - 

TBA securities

  -   (134)  - 

December 31, 2024

            

Mortgage-backed securities

 $-  $5,253,310  $- 

U.S. Treasury securities

  100,551   -   - 

Interest rate swaps

  -   4,574   - 

TBA securities

  -   4,371   -