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Note 7 - Debt, Credit Facility and Leases (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
  

June 30, 2021

 
  

Senior Notes

  

IQ Notes

  

Total

 

Principal

 $475,000  $38,918  $513,918 

Unamortized discount/premium and issuance costs

  (6,007)  700   (5,307)

Long-term debt balance

 $468,993  $39,618  $508,611 
  

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

June 30,

 

Senior Notes

  

IQ Notes

  

Finance Leases

  

Operating Leases

 

2022

 $34,438  $2,536  $6,793  $3,423 

2023

  34,438   2,536   4,637   2,619 

2024

  34,438   2,536   3,447   1,514 

2025

  34,438   2,536   1,276   541 

2026

  34,438   38,980      524 

Thereafter

  530,958         2,084 

Total

 $703,148  $49,124  $16,153  $10,705