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Note 17 - Share Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Weighted average grant date fair value |  | $ | 19.33 |  |  | $ | 17.86 |  |  | $ | 16.84 |
Assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Expected stock price volatility |  |  | 33 | % |  |  | 37 | % |  |  | 40 | %
Risk free interest rate |  |  | 2.52 | % |  |  | 2.60 | % |  |  | 1.92 | %
Expected annual dividend per share |  | $ | - |  |  | $ | - |  |  | $ | - |
Expected life of options (years) |  |  | 6.25 |  |  |  | 6.25 |  |  |  | 6.25 |
Share-based Payment Arrangement, Option, 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, 2016 |  |  | 1,482,964 |  |  | $ | 27.49 |  |  |  | 7.5 |  |  | $ | 23,840 |
Granted |  |  | 346,421 |  |  |  | 40.13 |  |  |  |  |  |  |  |  |
Exercised |  |  | (287,375 | ) |  |  | 10.58 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (69,880 | ) |  |  | 41.12 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2017 |  |  | 1,472,130 |  |  |  | 33.11 |  |  |  | 7.3 |  |  | $ | 25,281 |
Granted |  |  | 366,231 |  |  |  | 43.88 |  |  |  |  |  |  |  |  |
Exercised |  |  | (267,909 | ) |  |  | 19.90 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (49,285 | ) |  |  | 43.34 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2018 |  |  | 1,521,167 |  |  |  | 37.70 |  |  |  | 7.0 |  |  | $ | 19,212 |
Granted |  |  | 369,779 |  |  |  | 52.07 |  |  |  |  |  |  |  |  |
Exercised |  |  | (263,250 | ) |  |  | 30.75 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (35,010 | ) |  |  | 43.79 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2019 |  |  | 1,592,686 |  |  |  | 42.04 |  |  |  | 6.9 |  |  | $ | 93,242 |
Exercisable as of December 31, 2019 |  |  | 726,817 |  |  |  | 37.78 |  |  |  | 5.3 |  |  | $ | 45,649 |
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Grant-Date Fair Value |
Non-vested as of December 31, 2016 |  |  | 361,403 |  |  | $ | 38.18 |
Granted |  |  | 211,769 |  |  |  | 39.91 |
Vested |  |  | (133,796 | ) |  |  | 40.60 |
Forfeited |  |  | (47,100 | ) |  |  | 42.48 |
Non-vested as of December 31, 2017 |  |  | 392,276 |  |  |  | 37.77 |
Granted |  |  | 208,803 |  |  |  | 44.49 |
Vested |  |  | (128,433 | ) |  |  | 39.03 |
Forfeited |  |  | (46,650 | ) |  |  | 39.43 |
Non-vested as of December 31, 2018 |  |  | 425,996 |  |  |  | 40.50 |
Granted |  |  | 265,255 |  |  |  | 62.38 |
Vested |  |  | (184,628 | ) |  |  | 38.78 |
Forfeited |  |  | (14,986 | ) |  |  | 44.23 |
Non-vested as of December 31, 2019 |  |  | 491,637 |  |  |  | 52.84 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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