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Note 5 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2016
Notes Tables |
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 |
Forfeited |  |  | (12,000 | ) |  |  | 38.26 |  |  |  |  |  |  |  |  |
Balance, June 30, 2016 |  |  | 408,390 |  |  | $ | 23.37 |  |  |  | 1.6 |  |  | $ | 1,973 |
Exercised |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Balance, September 30, 2016 |  |  | 408,390 |  |  | $ | 23.37 |  |  |  | 1.4 |  |  | $ | 3,026 |
Exercisable, September 30, 2016 |  |  | 408,390 |  |  | $ | 23.37 |  |  |  | 1.4 |  |  | $ | 3,026 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Units |
Balance at December 31, 2015 |  |  | 542,375 |
Granted |  |  | 88,693 |
Vested |  |  | (13,780 | )
Forfeited |  |  | (3,290 | )
Balance at September 30, 2016 |  |  | 613,998 |
Schedule Of Tax Benefit Short Fall From Share Based Payment Arrangements [Table Text Block] |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
(Dollars in thousands) |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Tax benefit/(short-fall) of tax deductions in excess of grant-date fair value |  | $ | - |  |  | $ | 17 |  |  | $ | (3,366 | ) |  | $ | (5,602 | )
Benefit of tax deductions on grant-date fair value |  |  | - |  |  |  | 275 |  |  |  | 3,370 |  |  |  | 6,421 |
Total benefit of tax deductions |  | $ | - |  |  | $ | 292 |  |  | $ | 4 |  |  | $ | 819 |

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