Note 11 - Share-based Awards and Cash-based Awards - Schedule of Outstanding Restricted Stock Units Issued to Eligible Employees (Details) - Restricted Stock Units (RSUs) [Member] - shares |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|---|---|
| Awards expected to vest (in shares) | 1,614,722 | 3,355,917 | 5,765,251 | 6,107,248 |
| Vesting in 2020 [Member] | ||||
| Awards expected to vest (in shares) | 821,656 | |||
| Vesting in 2021 [Member] | ||||
| Awards expected to vest (in shares) | 793,066 |
| X | ||||||||||
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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