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Note 11 - Share Based Compensation and Employee Benefit Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | Average |  |  |  |  |
|  |  |  |  |  | Average |  |  | Remaining |  |  | Aggregate |
|  |  |  |  |  | Exercise |  |  | Contractual |  |  | Intrinsic |
Options |  | Shares |  |  | Price |  |  | Life (in Years) |  |  | Value |
Balance of Outstanding Options at January 1, 2019 |  |  | 2,984,280 |  |  | $ | 27.63 |  |  |  |  |  |  |  |  |
Granted |  |  | 482,663 |  |  |  | 41.15 |  |  |  |  |  |  |  |  |
Exercised |  |  | (375,950 | ) |  |  | 20.19 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (23,333 | ) |  |  | 33.84 |  |  |  |  |  |  |  |  |
Balance of Outstanding Options at December 31, 2019 |  |  | 3,067,660 |  |  | $ | 30.62 |  |  |  | 5.96 |  |  | $ | 48,712,030 |
Expected to vest after December 31, 2019 |  |  | 1,778,219 |  |  | $ | 34.70 |  |  |  | 7.64 |  |  | $ | 20,984,383 |
Vested and exercisable at December 31, 2019 |  |  | 1,259,505 |  |  | $ | 24.65 |  |  |  | 3.55 |  |  | $ | 27,521,030 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  | Number of |  |  | Grant Date |
Non-vested Shares |  | Shares |  |  | Fair Value |
Non-vested at January 1, 2019 |  |  | 1,796,356 |  |  | $ | 11.74 |
Granted |  |  | 482,663 |  |  |  | 12.56 |
Vested |  |  | (447,531 | ) |  |  | 11.12 |
Forfeited |  |  | (23,333 | ) |  |  | 11.92 |
Non-vested at December 31, 2019 |  |  | 1,808,155 |  |  | $ | 12.11 |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  |  |  |  |  | Weighted |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Average |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | Remaining |  |  | Aggregate |  |  | Average |
|  |  |  |  |  | Contractual |  |  | Intrinsic |  |  | Grant Date |
Stock Awards and Units |  | Shares |  |  | Life (in Years) |  |  | Value |  |  | Fair Value |
Outstanding non-vested shares at January 1, 2019 |  |  | 573,134 |  |  |  |  |  |  |  |  |  |  | $ | 34.07 |
Granted |  |  | 330,909 |  |  |  |  |  |  |  |  |  |  |  | 40.36 |
Vested |  |  | (293,615 | ) |  |  |  |  |  |  |  |  |  |  | 30.32 |
Outstanding non-vested at December 31, 2019 |  |  | 610,428 |  |  |  | 8.6 |  |  | $ | 27,896,560 |  |  | $ | 39.06 |
Expected to vest after December 31, 2019 |  |  | 609,419 |  |  |  | 8.6 |  |  | $ | 27,850,441 |  |  |  |  |

X
- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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