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Note 11 - Pledged Collateral Related to Securities Sold Under Repurchase Agreements (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]
   

2020

   

2019

 
   

Remaining Contractual Maturity of the Agreements

 
   

Overnight

   

Overnight

 
                 
                 

Securities sold under agreements to repurchase:

               

U.S. government treasuries

  $ 2,069     $ 3,528  

U.S. government agencies

    39,362       35,557  

U.S. government mortgage-backed securities

    14,320       19,614  
                 

Total pledged collateral

  $ 55,751     $ 58,699