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Note 7 - Debt, Credit Facility and Leases (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedule of Long-Term Debt Instruments [Table Text Block] |
|  | June 30, 2022 |
|  | Senior Notes |  |  | IQ Notes |  |  | Total |
Principal |  | $ | 475,000 |  |  | $ | 37,433 |  |  | $ | 512,433 |
Unamortized discount/premium and issuance costs |  |  | (5,096 | ) |  |  | 504 |  |  |  | (4,592 | )
Long-term debt balance |  | $ | 469,904 |  |  | $ | 37,937 |  |  | $ | 507,841 |
|  | December 31, 2021 |
|  | Senior Notes |  |  | IQ Notes |  |  | Total |
Principal |  | $ | 475,000 |  |  | $ | 38,051 |  |  | $ | 513,051 |
Unamortized discount/premium and issuance costs |  |  | (5,552 | ) |  |  | 596 |  |  |  | (4,956 | )
Long-term debt balance |  | $ | 469,448 |  |  | $ | 38,647 |  |  | $ | 508,095 |
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 |
2023 |  | $ | 34,438 |  |  | $ | 2,441 |  |  | $ | 6,424 |  |  | $ | 3,011 |
2024 |  |  | 34,438 |  |  |  | 2,441 |  |  |  | 5,220 |  |  |  | 2,041 |
2025 |  |  | 34,438 |  |  |  | 2,441 |  |  |  | 3,070 |  |  |  | 1,072 |
2026 |  |  | 34,438 |  |  |  | 37,528 |  |  |  | 1,213 |  |  |  | 1,059 |
2027 |  |  | 34,438 |  |  |  | — |  |  |  | — |  |  |  | 1,010 |
Thereafter |  |  | 496,521 |  |  |  | — |  |  |  | — |  |  |  | 6,043 |
Total |  | $ | 668,711 |  |  | $ | 44,851 |  |  | $ | 15,927 |  |  | $ | 14,236 |

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