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Note 11 - Share Based Compensation and Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
Options |  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (in Years) |  |  | Aggregate Intrinsic Value |
Balance of Outstanding Options at January 1, 2015 |  |  | 3,182,976 |  |  | $ | 19.55 |  |  |  |  |  |  |  |  |
Granted |  |  | 484,838 |  |  |  | 27.10 |  |  |  |  |  |  |  |  |
Exercised |  |  | (182,199 | ) |  |  | 12.47 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (10,500 | ) |  |  | 28.13 |  |  |  |  |  |  |  |  |
Balance of Outstanding Options at December 31, 2015 |  |  | 3,475,115 |  |  | $ | 20.95 |  |  |  | 5.77 |  |  | $ | 12,011,648 |
Expected to vest after December 31, 2015 |  |  | 1,851,300 |  |  | $ | 25.97 |  |  |  | 7.53 |  |  | $ | 559,698 |
Vested and exercisable at December 31, 2015 |  |  | 1,555,242 |  |  | $ | 14.78 |  |  |  | 3.61 |  |  | $ | 11,409,144 |
Schedule of Nonvested Share Activity [Table Text Block] |
Non-vested Shares |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested at January 1, 2015 |  |  | 2,038,064 |  |  | $ | 11.48 |
Granted |  |  | 484,838 |  |  |  | 11.27 |
Vested |  |  | (592,529 | ) |  |  | 8.63 |
Forfeited |  |  | (10,500 | ) |  |  | 13.57 |
Non-vested at December 31, 2015 |  |  | 1,919,873 |  |  | $ | 12.30 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
Stock Awards and Units |  | Shares |  |  | Weighted Average Remaining Contractual Life (in Years) |  |  | Aggregate Intrinsic Value |  |  | Weighted Average Grant Date Fair Value |
Outstanding Non-vested shares at January 1, 2015 |  |  | 402,350 |  |  |  |  |  |  |  |  |  |  | $ | 24.53 |
Granted |  |  | 285,950 |  |  |  |  |  |  |  |  |  |  |  | 24.75 |
Vested |  |  | (204,965 | ) |  |  |  |  |  |  |  |  |  |  | 24.35 |
Forfeited |  |  | ─ |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Non-vested at December 31, 2015 |  |  | 483,335 |  |  |  | 8.6 |  |  | $ | 10,580,203 |  |  | $ | 24.73 |
Expected to vest after December 31, 2015 |  |  | 479,921 |  |  |  | 8.6 |  |  | $ | 10,505,471 |  |  |  |  |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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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