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Note 8 - Debt, Credit Facility and Leases (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
  

September 30, 2021

 
  

Senior Notes

  

IQ Notes

  

Total

 

Principal

 $475,000  $37,862  $512,862 

Unamortized discount/premium and issuance costs

  (5,779)  629   (5,150)

Long-term debt balance

 $469,221  $38,491  $507,712 
  

December 31, 2020

 
  

Senior Notes

  

IQ Notes

  

Total

 

Principal

 $475,000  $37,886  $512,886 

Unamortized discount/premium and issuance costs

  (6,462)  818   (5,644)

Long-term debt balance

 $468,538  $38,704  $507,242 
Schedule of Maturities of Long Term Debt and Finance and Operating Lease Liabilities [Table Text Block]

Twelve-month

period ending

September 30,

 

Senior Notes

  

IQ Notes

  

Finance Leases

  

Operating Leases

 

2022

 $34,438  $2,467  $6,336  $3,166 

2023

  34,438   2,467   4,590   2,590 

2024

  34,438   2,467   3,313   1,037 

2025

  34,438   2,467   855   533 

2026

  34,438   37,301      524 

Thereafter

  522,349         1,953 

Total

 $694,539  $47,169  $15,094  $9,803