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Note 3 - Securities (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
  

Amortized Cost

  

Gross Unrealized Gains

  

Gross Unrealized Losses

  

Fair Value

 

Available-for-Sale Securities

                

June 30, 2022

                

Certificates of deposit

 $248  $  $  $248 

Municipal securities

  400      (13)  387 

U.S. Treasury Notes

  157,573   197   (5,193)  152,577 

Mortgage-backed securities - residential

  4,362   53   (33)  4,382 

Collateralized mortgage obligations - residential

  1,366      (9)  1,357 
  $163,949  $250  $(5,248) $158,951 

December 31, 2021

                

Certificates of deposit

 $2,728  $  $  $2,728 

U.S. Treasury Notes

  76,621   8   (76)  76,553 

Mortgage-backed securities - residential

  4,660   173      4,833 

Collateralized mortgage obligations - residential

  1,576   4      1,580 
  $85,585  $185  $(76) $85,694 
Investments Classified by Contractual Maturity Date [Table Text Block]
  

June 30, 2022

 
  

Amortized Cost

  

Fair Value

 

Due in one year or less

 $408  $407 

Due after one year through five years

  157,813   152,805 
   158,221   153,212 

Mortgage-backed securities - residential

  4,362   4,382 

Collateralized mortgage obligations - residential

  1,366   1,357 
  $163,949  $158,951 
Schedule of Unrealized Loss on Investments [Table Text Block]
  

Less than 12 Months

  

12 Months or More

  

Total

 
  

Count

  

Fair Value

  

Unrealized Loss

  

Count

  

Fair Value

  

Unrealized Loss

  

Count

  

Fair Value

  

Unrealized Loss

 
                                     

June 30, 2022

                                    

Municipal securities

  2  $387  $(13)    $  $   2  $387  $(13)

U.S. Treasury Notes

  187   123,930   (5,193)           187   123,930   (5,193)

Mortgage-backed securities - residential

  15   2,746   (33)           15   2,746   (33)

Collateralized mortgage obligations - residential

  5   1,126   (7)  1   197   (2)  6   1,323   (9)
   209  $128,189  $(5,246)  1  $197  $(2)  210  $128,386  $(5,248)
                                     

December 31, 2021

                                    

U.S. Treasury Notes

  53  $62,246  $(76)    $  $   53  $62,246  $(76)