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Note 9 - Debt, Credit Facility and Leases (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Long-term Debt Instruments [Table Text Block] |
|  | 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 |
|  | 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 [Table Text Block] |
|  | Senior Notes |  |  | IQ Notes |
2022 |  | $ | 34,438 |  |  | $ | 2,479 |
2023 |  |  | 34,438 |  |  |  | 2,479 |
2024 |  |  | 34,438 |  |  |  | 2,479 |
2025 |  |  | 34,438 |  |  |  | 39,342 |
2026 |  |  | 34,438 |  |  |  | — |
2027 |  |  | 34,438 |  |  |  | — |
2028 |  |  | 479,302 |  |  |  | — |
Total |  | $ | 685,930 |  |  | $ | 46,779 |
Schedule of Line of Credit Facilities [Table Text Block] |
Interest rates: |  |  |  |
Spread over the London Interbank Offered Rate |  |  | 2.25 - 4.00 | %
Spread over alternative base rate |  |  | 1.25 - 3.00 | %
Standby fee per annum on undrawn amounts |  |  | 0.5625 - 1.00 | %
Covenant financial ratios: |  |  |  |
Senior leverage ratio (debt secured by liens/EBITDA) |  | not more than 2.50:1 |
Leverage ratio (total debt less unencumbered cash/EBITDA) |  | not more than 4.00:1 |
Interest coverage ratio (EBITDA/interest expense) |  | not less than 3.00:1 |
Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] |
Twelve-month period ending December 31, |  |  |  |
2022 |  | $ | 6,097 |
2023 |  |  | 4,422 |
2024 |  |  | 3,156 |
2025 |  |  | 556 |
Total |  |  | 14,231 |
Less: imputed interest |  |  | (843 | )
Net finance lease obligation |  | $ | 13,388 |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] |
Twelve-month period ending December 31, |  |  |  |
2022 |  | $ | 3,153 |
2023 |  |  | 3,011 |
2024 |  |  | 1,084 |
2025 |  |  | 1,058 |
2026 |  |  | 1,059 |
More than 5 years |  |  | 6,418 |
Total |  |  | 15,783 |
Effect of discounting |  |  | (3,347 | )
Operating lease liability |  | $ | 12,436 |

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