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Note 7 - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   

March 31,
2023

   

December 31,
2022

 
   

(unaudited)

         

Carrying amount (excluding unamortized debt issuance costs)

  $ 1,187,267     $ 1,171,238  

Estimated fair value

  $ 1,136,730     $ 1,092,345