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Note 6 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2026
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   

June 30,
2026

   

December 31,
2025

 
                 

Carrying amount (excluding unamortized debt issuance costs)

  $ 1,287,225     $ 1,286,233  

Estimated fair value

  $ 1,265,119     $ 1,267,698