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Note 8 - Debt, Credit Facility and Leases (Tables) | 9 Months Ended
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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 |

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