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Note 15 - Share-based Payments - Summary of Exercise Prices, Weighted Average Remaining Contractual Life and Intrinsic Values of Outstanding Options (Details) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($) $ / shares shares
Number outstanding (in shares) | shares | 871,662
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 54.38
Weighted average remaining contractual life, options outstanding (Year) | 4 years 6 months
Aggregate intrinsic value, options outstanding | $ | $ 12,660
Number exercisable (in shares) | shares | 436,862
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 48.57
Weighted average remaining contractual life, options exercisable (Year) | 3 years 3 months 18 days
Aggregate intrinsic value, options exercisable | $ | $ 8,881
Exercise Price Range 01 [Member] |
Exercise price - lower limit (in dollars per share) | $ 10.16
Exercise price - upper limit (in dollars per share) | $ 19.95
Number outstanding (in shares) | shares | 61,514
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 16.21
Weighted average remaining contractual life, options outstanding (Year) | 1 year
Aggregate intrinsic value, options outstanding | $ | $ 3,241
Number exercisable (in shares) | shares | 61,514
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 16.21
Weighted average remaining contractual life, options exercisable (Year) | 1 year
Aggregate intrinsic value, options exercisable | $ | $ 3,241
Exercise Price Range 02 [Member] |
Exercise price - lower limit (in dollars per share) | $ 21.10
Exercise price - upper limit (in dollars per share) | $ 27.53
Number outstanding (in shares) | shares | 36,250
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 23.76
Weighted average remaining contractual life, options outstanding (Year) | 1 year 8 months 12 days
Aggregate intrinsic value, options outstanding | $ | $ 1,636
Number exercisable (in shares) | shares | 36,250
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 23.76
Weighted average remaining contractual life, options exercisable (Year) | 1 year 8 months 12 days
Aggregate intrinsic value, options exercisable | $ | $ 1,636
Exercise Price Range 03 [Member] |
Exercise price - lower limit (in dollars per share) | $ 32.25
Exercise price - upper limit (in dollars per share) | $ 37.35
Number outstanding (in shares) | shares | 5,625
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 36.88
Weighted average remaining contractual life, options outstanding (Year) | 1 year 8 months 12 days
Aggregate intrinsic value, options outstanding | $ | $ 180
Number exercisable (in shares) | shares | 4,375
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 37.35
Weighted average remaining contractual life, options exercisable (Year) | 1 year 3 months 18 days
Aggregate intrinsic value, options exercisable | $ | $ 138
Exercise Price Range 04 [Member] |
Exercise price - lower limit (in dollars per share) | $ 46.90
Exercise price - upper limit (in dollars per share) | $ 48.00
Number outstanding (in shares) | shares | 14,000
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 47.33
Weighted average remaining contractual life, options outstanding (Year) | 5 years 4 months 24 days
Aggregate intrinsic value, options outstanding | $ | $ 302
Number exercisable (in shares) | shares | 3,750
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 47.00
Weighted average remaining contractual life, options exercisable (Year) | 3 years 4 months 24 days
Aggregate intrinsic value, options exercisable | $ | $ 82
Exercise Price Range 05 [Member] |
Exercise price - lower limit (in dollars per share) | $ 51.82
Exercise price - upper limit (in dollars per share) | $ 59.98
Number outstanding (in shares) | shares | 329,046
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 55.52
Weighted average remaining contractual life, options outstanding (Year) | 3 years 9 months 18 days
Aggregate intrinsic value, options outstanding | $ | $ 4,402
Number exercisable (in shares) | shares | 248,490
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 55.52
Weighted average remaining contractual life, options exercisable (Year) | 3 years 7 months 6 days
Aggregate intrinsic value, options exercisable | $ | $ 3,325
Exercise Price Range 06 [Member] |
Exercise price - lower limit (in dollars per share) | $ 60.01
Exercise price - upper limit (in dollars per share) | $ 68.41
Number outstanding (in shares) | shares | 425,227
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 62.08
Weighted average remaining contractual life, options outstanding (Year) | 5 years 9 months 18 days
Aggregate intrinsic value, options outstanding | $ | $ 2,899
Number exercisable (in shares) | shares | 82,483
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 63.33
Weighted average remaining contractual life, options exercisable (Year) | 5 years 1 month 6 days
Aggregate intrinsic value, options exercisable | $ | $ 459

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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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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