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Note 11 - Share Based Compensation and Employee Benefit Plans - Non-vested Options (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Non-vested balance (in shares) | 1,836,062 |  |
Non-vested, weighted average grant date fair value (in dollars per share) | $ 11.12 |  |
Granted (in shares) | 459,663 |  |
Weighted-average fair value of stock options granted (in dollars per share) | $ 15.46 | $ 12.33 | $ 6.54
Vested (in shares) | (430,040) |  |
Vested, weighted average grant date fair value (in dollars per share) | $ 13.26 |  |
Forfeited (in shares) | (69,329) |  |
Forfeited, weighted average grant date fair value (in dollars per share) | $ 10.73 |  |
Non-vested balance (in shares) | 1,796,356 | 1,836,062 |
Non-vested, weighted average grant date fair value (in dollars per share) | $ 11.74 | $ 11.12 |

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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X
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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