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Note 7 - Debt, Credit Facility and Leases (Tables) | 6 Months Ended
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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 |

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