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Note 9 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Fair Value Option, Disclosures [Table Text Block]
    

September 30, 2022

  

December 31, 2021

 
  

Fair Value

 

Carrying

  

Estimated

  

Carrying

  

Estimated

 

(In thousands)

 

Hierarchy Level

 

Value

  

Fair Value

  

Value

  

Fair Value

 

Debt:

                  

NRP 2025 Senior Notes

 1 $120,199  $124,165  $296,236  $300,000 

Opco Senior Notes (1)

 3  118,524   122,146   137,309   138,484 

Opco Credit Facility

 3            
                   

Assets:

                  

Contract receivable, net (current and long-term) (2)

 3 $31,948  $25,144  $33,612  $26,010