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Note 5 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Shares |  |  | Weighted-average Exercise Price |  |  | Weighted-average Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value (in thousands) |
Balance, December 31, 2015 |  |  | 1,031,170 |  |  | $ | 31.27 |  |  |  | 0.9 |  |  | $ | 3,268 |
Exercised |  |  | (2,110 | ) |  |  | 23.37 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (608,670 | ) |  |  | 36.46 |  |  |  |  |  |  |  |  |
Balance, March 31, 2016 |  |  | 420,390 |  |  | $ | 23.80 |  |  |  | 1.8 |  |  | $ | 2,026 |
Exercisable, March 31, 2016 |  |  | 420,390 |  |  | $ | 23.80 |  |  |  | 1.8 |  |  | $ | 2,026 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Units |
Balance at December 31, 2015 |  |  | 542,375 |
Vested |  |  | (4,812 | )
Balance at March 31, 2016 |  |  | 537,563 |
Schedule of Tax Benefit (Short-fall) from Share-based Payment Arrangements [Table Text Block] |
|  | Three months ended March 31, |
(Dollars in thousands) |  | 2016 |  |  | 2015 |
Tax benefit/(short-fall) of tax deductions in excess of grant-date fair value |  | $ | (3,298 | ) |  | $ | (4,395 | )
Benefit of tax deductions on grant-date fair value |  |  | 3,302 |  |  |  | 4,442 |
Total benefit of tax deductions |  | $ | 4 |  |  | $ | 47 |

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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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