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Note 9 - Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Nine Months Ended September 30, |
|  | 2015 |  |  | 2014 |
|  | Shares |  |  | Weighted-Average Exercise Price |  |  | Shares |  |  | Weighted-Average Exercise Price |
Beginning balance |  |  | 759,683 |  |  | $ | 11.36 |  |  |  | 503,834 |  |  | $ | 10.41 |
Issued |  |  | - |  |  |  | - |  |  |  | 21,000 |  |  |  | 32.77 |
Exercised |  |  | (377,357 | ) |  |  | 12.73 |  |  |  | (64,926 | ) |  |  | 16.78 |
Forfeited |  |  | (12,380 | ) |  |  | 29.58 |  |  |  | (110 | ) |  |  | 5.76 |
Expired |  |  | (8,476 | ) |  |  | 17.32 |  |  |  | (1,225 | ) |  |  | 9.00 |
Ending balance |  |  | 361,470 |  |  | $ | 9.16 |  |  |  | 458,573 |  |  | $ | 10.54 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Weighted-Average |
Outstanding: |  |  | Stock Options |  |  | Weighted-Average |  |  | Remaining |
Range of Exercise Prices |  |  | Outstanding |  |  | Exercise Price |  |  | Contractual Life |
$ | 5.76 |  |  | $ | 9.21 |  |  |  | 221,669 |  |  | $ | 5.76 |  |  |  | 3.28 |
$ | 9.22 |  |  | $ | 15.47 |  |  |  | 108,611 |  |  |  | 12.40 |  |  |  | 2.15 |
$ | 15.48 |  |  | $ | 22.66 |  |  |  | 18,794 |  |  |  | 19.28 |  |  |  | 7.75 |
$ | 22.67 |  |  | $ | 32.36 |  |  |  | 12,396 |  |  |  | 26.18 |  |  |  | 2.19 |
|  |  |  |  |  |  |  |  | 361,470 |  |  | $ | 9.16 |  |  |  | 3.13 |
Exercisable: |  |  | Stock Options |  |  | Weighted-Average |  |  |  |  |
Range of Exercise Prices |  |  | Exercisable |  |  | Exercise Price |  |  |  |  |
$ | 5.76 |  |  | $ | 9.21 |  |  |  | 164,759 |  |  | $ | 5.76 |  |  |  |  |
$ | 9.22 |  |  | $ | 15.47 |  |  |  | 101,941 |  |  |  | 12.51 |  |  |  |  |
$ | 15.48 |  |  | $ | 22.66 |  |  |  | 15,164 |  |  |  | 19.60 |  |  |  |  |
$ | 22.67 |  |  | $ | 32.36 |  |  |  | 10,896 |  |  |  | 26.36 |  |  |  |  |
|  |  |  |  |  |  |  |  | 292,760 |  |  | $ | 9.60 |  |  |  |  |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Nine Months Ended |  |  | Years Ended December 31, |
|  | September 30, 2015 |  |  | 2014 |  |  | 2013 |
Expected volatility |  |  | N/A |  |  |  | 34.25 | % |  |  | 34.12 | %
Weighted-Average volatility |  |  | N/A |  |  |  | 34.25 | % |  |  | 34.12 | %
Expected dividends |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected term (in years) |  |  | N/A |  |  |  | 9.4 |  |  |  | 7.5 |
Risk-free rate |  |  | N/A |  |  |  | 2.26 | % |  |  | 1.31 | %
Weighted-average fair value (grant date) |  |  | N/A |  |  | $ | 13.49 |  |  | $ | 7.83 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Nine Months Ended September 30, |
|  | 2015 |  |  | 2014 |
|  | Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Shares |  |  | Weighted- Average Grant Date Fair Value |
Unvested at beginning |  |  | 509,336 |  |  | $ | 21.58 |  |  |  | 614,580 |  |  | $ | 18.71 |
Issued |  |  | 78,070 |  |  |  | 36.06 |  |  |  | 78,947 |  |  |  | 33.24 |
Forfeited |  |  | (4,150 | ) |  |  | 31.83 |  |  |  | (832 | ) |  |  | 23.59 |
Vested |  |  | (195,503 | ) |  |  | 20.74 |  |  |  | (184,921 | ) |  |  | 17.54 |
Unvested at end |  |  | 387,753 |  |  | $ | 24.81 |  |  |  | 507,774 |  |  | $ | 21.33 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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