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Note 9 - Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Six Months Ended June 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 |  |  | (369,952 | ) |  |  | 12.70 |  |  |  | (24,897 | ) |  |  | 12.25 |
Forfeited |  |  | (1,650 | ) |  |  | 15.48 |  |  |  | (110 | ) |  |  | 5.76 |
Expired |  |  | (8,007 | ) |  |  | 16.90 |  |  |  | (408 | ) |  |  | 9.37 |
Ending balance |  |  | 380,074 |  |  | $ | 9.92 |  |  |  | 499,419 |  |  | $ | 11.26 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
| Outstanding: |  |  | Stock Options |  |  | Weighted-Average |  |  | Weighted-Average Remaining |
| Range of Exercise Prices |  |  | Outstanding |  |  | Exercise Price |  |  | Contractual Life |
| $ | 5.76 $9.21 |  |  |  | 223,329 |  |  | $ | 5.76 |  |  |  | 3.53 |
| $ | 9.22 $15.47 |  |  |  | 110,305 |  |  |  | 12.38 |  |  |  | 2.46 |
| $ | 15.48 $22.66 |  |  |  | 22,706 |  |  |  | 19.07 |  |  |  | 7.99 |
| $ | 22.67 $32.36 |  |  |  | 23,734 |  |  |  | 28.82 |  |  |  | 5.96 |
|  |  |  |  |  | 380,074 |  |  | $ | 9.92 |  |  |  | 3.64 |
| Exercisable: |  |  | Stock Options |  |  | Weighted-Average |  |  |  |  |
| Range of Exercise Prices |  |  | Exercisable |  |  | Exercise Price |  |  |  |  |
| $ | 5.76 $9.21 |  |  |  | 166,419 |  |  | $ | 5.76 |  |  |  |  |
| $ | 9.22 $15.47 |  |  |  | 103,305 |  |  |  | 12.48 |  |  |  |  |
| $ | 15.48 $22.66 |  |  |  | 19,076 |  |  |  | 19.28 |  |  |  |  |
| $ | 22.67 $32.36 |  |  |  | 11,334 |  |  |  | 26.27 |  |  |  |  |
|  |  |  |  |  | 300,134 |  |  | $ | 9.71 |  |  |  |  |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Six Months Ended |  |  | Years Ended December 31, |
|  | June 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] |
|  | Six Months Ended June 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 |  |  | (1,209 | ) |  |  | 28.67 |  |  |  | (832 | ) |  |  | 23.59 |
Vested |  |  | (193,930 | ) |  |  | 20.66 |  |  |  | (184,921 | ) |  |  | 17.54 |
Unvested at end |  |  | 392,267 |  |  | $ | 24.89 |  |  |  | 507,774 |  |  | $ | 21.39 |

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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 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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