Note 10 - Share-based Awards and Cash-based Awards - Summary of Compensation Expense Related to Share-based Awards and Cash-Based Awards (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Share-based compensation expense | $ 3,959 | $ 3,690 | $ 3,540 |
| Total charged to operating income | 8,827 | 14,793 | 16,722 |
| General and Administrative Expense [Member] | |||
| Share-based compensation expense | 3,959 | 3,690 | 3,540 |
| Cash-based incentive compensation | 4,019 | 8,897 | 9,586 |
| Lease Operating Expense [Member] | |||
| Cash-based incentive compensation | $ 849 | $ 2,206 | $ 3,596 |
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Cash-based incentive compensation charged to operating income (loss). No definition available.
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| X | ||||||||||
- Definition The total amount of share-based and cash-based incentive compensation charged to operating income. No definition available.
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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