Note 7 - Share-based Awards and Cash-based Awards - Summary of Compensation Expense Related to Share-based Awards and Cash-Based Awards (Details) - USD ($) $ in Thousands |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2021 |
Mar. 31, 2020 |
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| Share-based compensation expense | $ 454 | $ 1,048 | ||
| Total charged to operating income | 3,975 | 5,528 | ||
| General and Administrative Expense [Member] | ||||
| Share-based compensation expense | 454 | 1,048 | ||
| Cash-based incentive compensation | [1] | 2,682 | 3,631 | |
| Lease Operating Expense [Member] | ||||
| Cash-based incentive compensation | [1] | $ 839 | $ 849 | |
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| 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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