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Note 14 - Share-based Payments - Summary of Exercise Prices, Weighted Average Remaining Contractual Life and Intrinsic Values of Outstanding Options (Details) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($) $ / shares shares
Number outstanding (in shares) | shares | 734,196
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 42.39
Weighted average remaining contractual life, options outstanding (Year) | 4 years 328 days
Aggregate intrinsic value, options outstanding | $ | $ 13,852
Number exercisable (in shares) | shares | 229,780
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 16.92
Weighted average remaining contractual life, options exercisable (Year) | 2 years 219 days
Aggregate intrinsic value, options exercisable | $ | $ 10,047
Exercise Price Range 01 [Member] |
Exercise price - lower (in dollars per share) | $ 2.92
Exercise price - higher (in dollars per share) | $ 8.92
Number outstanding (in shares) | shares | 75,367
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 6.94
Weighted average remaining contractual life, options outstanding (Year) | 1 year 73 days
Aggregate intrinsic value, options outstanding | $ | $ 4,048
Number exercisable (in shares) | shares | 75,367
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 6.94
Weighted average remaining contractual life, options exercisable (Year) | 1 year 73 days
Aggregate intrinsic value, options exercisable | $ | $ 4,048
Exercise Price Range 02 [Member] |
Exercise price - lower (in dollars per share) | $ 10.16
Exercise price - higher (in dollars per share) | $ 19.95
Number outstanding (in shares) | shares | 109,488
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 16.38
Weighted average remaining contractual life, options outstanding (Year) | 3 years
Aggregate intrinsic value, options outstanding | $ | $ 4,847
Number exercisable (in shares) | shares | 83,288
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 15.99
Weighted average remaining contractual life, options exercisable (Year) | 2 years 292 days
Aggregate intrinsic value, options exercisable | $ | $ 3,720
Exercise Price Range 03 [Member] |
Exercise price - lower (in dollars per share) | $ 21.10
Exercise price - higher (in dollars per share) | $ 27.53
Number outstanding (in shares) | shares | 72,500
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 23.76
Weighted average remaining contractual life, options outstanding (Year) | 3 years 219 days
Aggregate intrinsic value, options outstanding | $ | $ 2,674
Number exercisable (in shares) | shares | 52,500
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 24.78
Weighted average remaining contractual life, options exercisable (Year) | 3 years 73 days
Aggregate intrinsic value, options exercisable | $ | $ 1,883
Exercise Price Range 04 [Member] |
Exercise price - lower (in dollars per share) | $ 35.25
Exercise price - higher (in dollars per share) | $ 37.35
Number outstanding (in shares) | shares | 14,375
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 35.89
Weighted average remaining contractual life, options outstanding (Year) | 4 years 328 days
Aggregate intrinsic value, options outstanding | $ | $ 356
Number exercisable (in shares) | shares | 10,625
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 36.11
Weighted average remaining contractual life, options exercisable (Year) | 4 years 255 days
Aggregate intrinsic value, options exercisable | $ | $ 261
Exercise Price Range 05 [Member] |
Exercise price - lower (in dollars per share) | $ 43.15
Exercise price - higher (in dollars per share) | $ 47
Number outstanding (in shares) | shares | 18,500
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 44.19
Weighted average remaining contractual life, options outstanding (Year) | 5 years 219 days
Aggregate intrinsic value, options outstanding | $ | $ 305
Number exercisable (in shares) | shares | 8,000
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 43.75
Weighted average remaining contractual life, options exercisable (Year) | 5 years 219 days
Aggregate intrinsic value, options exercisable | $ | $ 135
Exercise Price Range 06 [Member] |
Exercise price - lower (in dollars per share) | $ 53.20
Exercise price - higher (in dollars per share) | $ 58.65
Number outstanding (in shares) | shares | 315,400
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 55.51
Weighted average remaining contractual life, options outstanding (Year) | 5 years 328 days
Aggregate intrinsic value, options outstanding | $ | $ 1,622
Number exercisable (in shares) | shares |
Weighted average exercise price per share, options exercisable (in dollars per share) |
Weighted average remaining contractual life, options exercisable (Year) |
Aggregate intrinsic value, options exercisable | $ |
Exercise Price Range 07 [Member] |
Exercise price - lower (in dollars per share) | $ 64.10
Exercise price - higher (in dollars per share) | $ 64.10
Number outstanding (in shares) | shares | 128,566
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 64.10
Weighted average remaining contractual life, options outstanding (Year) | 6 years 328 days
Aggregate intrinsic value, options outstanding | $ |
Number exercisable (in shares) | shares |
Weighted average exercise price per share, options exercisable (in dollars per share) |
Weighted average remaining contractual life, options exercisable (Year) |
Aggregate intrinsic value, options exercisable | $ |

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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