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Note 15 - Share Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 201 6 |  |  | 201 5 |  |  | 201 4 |
Weighted average grant date fair value |  | $ | 13.77 |  |  | $ | 19.07 |  |  | $ | 26.35 |
Assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Expected stock price volatility |  |  | 41 | % |  |  | 41 | % |  |  | 45 | %
Risk free interest rate |  |  | 1.31 | % |  |  | 1.72 | % |  |  | 1.90 | %
Expected annual dividend per share |  | $ | - |  |  | $ | - |  |  | $ | - |
Expected life of options (years) |  |  | 6.25 |  |  |  | 6.25 |  |  |  | 6.25 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value ($ in thousands) |
Outstanding as of December 31, 2013 |  |  | 2,937,301 |  |  | $ | 5.74 |  |  |  | 9.5 |  |  | $ | 148,369 |
Granted |  |  | 187,189 |  |  |  | 57.21 |  |  |  |  |  |  |  |  |
Exercised |  |  | (549,282 | ) |  |  | 3.44 |  |  |  |  |  |  |  |  |
Expired |  |  | (259 | ) |  |  | 15.94 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (32,810 | ) |  |  | 12.68 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2014 |  |  | 2,542,139 |  |  |  | 9.94 |  |  |  | 8.5 |  |  | $ | 96,518 |
Granted |  |  | 287,165 |  |  |  | 45.18 |  |  |  |  |  |  |  |  |
Exercised |  |  | (604,088 | ) |  |  | 3.79 |  |  |  |  |  |  |  |  |
Expired |  |  | (6,409 | ) |  |  | 50.11 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (90,793 | ) |  |  | 37.27 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2015 |  |  | 2,128,014 |  |  |  | 15.15 |  |  |  | 7.7 |  |  | $ | 40,271 |
Granted |  |  | 398,313 |  |  |  | 33.24 |  |  |  |  |  |  |  |  |
Exercised |  |  | (995,469 | ) |  |  | 2.89 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (47,894 | ) |  |  | 37.41 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2016 |  |  | 1,482,964 |  |  |  | 27.49 |  |  |  | 7.5 |  |  | $ | 23,840 |
Exercisable as of December 31, 2016 |  |  | 787,654 |  |  |  | 17.64 |  |  |  | 6.7 |  |  | $ | 19,897 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Shares |  |  | Weighted- Average Grant- Date Fair Value |
Non-vested as of December 31, 2013 |  |  | 304,406 |  |  | $ | 29.68 |
Granted |  |  | 115,473 |  |  |  | 54.35 |
Vested |  |  | (105,123 | ) |  |  | 28.31 |
Forfeited |  |  | (47,472 | ) |  |  | 42.31 |
Non-vested as of December 31, 2014 |  |  | 267,284 |  |  |  | 38.72 |
Granted |  |  | 193,117 |  |  |  | 41.31 |
Vested |  |  | (183,362 | ) |  |  | 32.56 |
Forfeited |  |  | (33,999 | ) |  |  | 47.77 |
Non-vested as of December 31, 2015 |  |  | 243,040 |  |  |  | 44.16 |
Granted |  |  | 232,295 |  |  |  | 33.56 |
Vested |  |  | (95,858 | ) |  |  | 41.93 |
Forfeited |  |  | (18,074 | ) |  |  | 38.30 |
Non-vested as of December 31, 2016 |  |  | 361,403 |  |  |  | 38.18 |

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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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