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Note 7 - Debt, Credit Facility and Leases (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Schedule of Long-Term Debt Instruments [Table Text Block] |
|  | March 31, 2022 |
|  | Senior Notes |  |  | IQ Notes |  |  | Total |
Principal |  | $ | 475,000 |  |  | $ | 38,605 |  |  | $ | 513,605 |
Unamortized discount/premium and issuance costs |  |  | (5,324 | ) |  |  | 571 |  |  |  | (4,753 | )
Long-term debt balance |  | $ | 469,676 |  |  | $ | 39,176 |  |  | $ | 508,852 |
|  | 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 March 31, |  | Senior Notes |  |  | IQ Notes |  |  | Finance Leases |  |  | Operating Leases |
2023 |  | $ | 34,438 |  |  | $ | 2,515 |  |  | $ | 6,365 |  |  | $ | 3,057 |
2024 |  |  | 34,438 |  |  |  | 2,515 |  |  |  | 4,881 |  |  |  | 2,528 |
2025 |  |  | 34,438 |  |  |  | 2,515 |  |  |  | 3,313 |  |  |  | 1,079 |
2026 |  |  | 34,438 |  |  |  | 39,295 |  |  |  | 943 |  |  |  | 1,059 |
2027 |  |  | 34,438 |  |  |  | — |  |  |  | — |  |  |  | 1,041 |
Thereafter |  |  | 505,130 |  |  |  | — |  |  |  | — |  |  |  | 6,174 |
Total |  | $ | 677,320 |  |  | $ | 46,840 |  |  | $ | 15,502 |  |  | $ | 14,938 |

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