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Note 7 - Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   

September 30,

2023

   

December 31,

2022

 
   

(unaudited)

         

Carrying amount (excluding unamortized debt issuance costs)

  $ 1,211,856     $ 1,171,238  

Estimated fair value

  $ 1,117,041     $ 1,092,345