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Note 10 - Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
      

Weighted

 
      

Average

 
  

Shares

  

Fair Value

 
         

Nonvested at beginning of year

  228,646  $35.84 

Grants

  84,685   50.34 

Vested

  (109,158)  32.10 

Forfeited

  (4,771)  42.70 
         

Nonvested at end of year

  199,402  $43.31 
Corporate and Bank Board Members [Member]  
Notes Tables  
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]
      Total Cost  

Grant Year

 

Shares Granted

  

(in thousands)

 

Covered Period

2022

  11,166  $359 

June 1, 2022 - May 31, 2023

2023

  11,529   350 

June 1, 2023 - May 31, 2024

2024

  11,316   423 

June 1, 2024 - May 31, 2025

2025

  10,007   444 

June 1, 2025 - May 31, 2026