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Note 7 - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

March 31,
2022

  

December 31,
2021

 
  

(unaudited)

     

Carrying amount (excluding unamortized debt issuance costs)

 $1,151,115  $1,144,052 

Estimated fair value

 $1,138,150  $1,199,409