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Note 1 - Basis of Presentation and Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Debt Securities, Held-to-Maturity [Table Text Block]
  

Amortized Cost

  

Gross Unrealized Gain

  

Fair Value

 

Held to maturity U.S. Treasury securities

 $58,822  $384  $59,206