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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 | 3 Months Ended
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Mar. 31, 2020 USD ($) $ / shares shares
Options outstanding, Number outstanding (in shares) | shares | 730,037
Options outstanding, Weighted average exercise price per share (in dollars per share) | $ 50.85
Options outstanding, Weighted average remaining contractual life (Year) | 4 years 73 days
Options outstanding, Aggregate intrinsic value | $ | $ 4,070
Options Exercisable, Number exercisable (in shares) | shares | 349,845
Options Exercisable, Weighted average exercise price per share (in dollars per share) | $ 41.65
Options Exercisable, Weighted average remaining contractual life (Year) | 3 years 36 days
Options Exercisable, Aggregate intrinsic value | $ | $ 4,046
Exercise Price Range 01 [Member] |
Exercise price - lower (in dollars per share) | $ 8.56
Exercise price - higher (in dollars per share) | $ 8.56
Options outstanding, Number outstanding (in shares) | shares | 15,722
Options outstanding, Weighted average exercise price per share (in dollars per share) | $ 8.56
Options outstanding, Weighted average remaining contractual life (Year) | 36 days
Options outstanding, Aggregate intrinsic value | $ | $ 624
Options Exercisable, Number exercisable (in shares) | shares | 15,722
Options Exercisable, Weighted average exercise price per share (in dollars per share) | $ 8.56
Options Exercisable, Weighted average remaining contractual life (Year) | 36 days
Options Exercisable, Aggregate intrinsic value | $ | $ 624
Exercise Price Range 02 [Member] |
Exercise price - lower (in dollars per share) | $ 10.16
Exercise price - higher (in dollars per share) | $ 19.95
Options outstanding, Number outstanding (in shares) | shares | 62,990
Options outstanding, Weighted average exercise price per share (in dollars per share) | $ 16.23
Options outstanding, Weighted average remaining contractual life (Year) | 1 year 182 days
Options outstanding, Aggregate intrinsic value | $ | $ 2,018
Options Exercisable, Number exercisable (in shares) | shares | 62,990
Options Exercisable, Weighted average exercise price per share (in dollars per share) | $ 16.23
Options Exercisable, Weighted average remaining contractual life (Year) | 1 year 182 days
Options Exercisable, Aggregate intrinsic value | $ | $ 2,018
Exercise Price Range 03 [Member] |
Exercise price - lower (in dollars per share) | $ 21.10
Exercise price - higher (in dollars per share) | $ 27.53
Options outstanding, Number outstanding (in shares) | shares | 51,250
Options outstanding, Weighted average exercise price per share (in dollars per share) | $ 24.11
Options outstanding, Weighted average remaining contractual life (Year) | 1 year 255 days
Options outstanding, Aggregate intrinsic value | $ | $ 1,237
Options Exercisable, Number exercisable (in shares) | shares | 51,250
Options Exercisable, Weighted average exercise price per share (in dollars per share) | $ 24.11
Options Exercisable, Weighted average remaining contractual life (Year) | 1 year 255 days
Options Exercisable, Aggregate intrinsic value | $ | $ 1,237
Exercise Price Range 04 [Member] |
Exercise price - lower (in dollars per share) | $ 35.25
Exercise price - higher (in dollars per share) | $ 37.35
Options outstanding, Number outstanding (in shares) | shares | 14,375
Options outstanding, Weighted average exercise price per share (in dollars per share) | $ 35.89
Options outstanding, Weighted average remaining contractual life (Year) | 3 years 73 days
Options outstanding, Aggregate intrinsic value | $ | $ 178
Options Exercisable, Number exercisable (in shares) | shares | 13,125
Options Exercisable, Weighted average exercise price per share (in dollars per share) | $ 35.95
Options Exercisable, Weighted average remaining contractual life (Year) | 3 years 36 days
Options Exercisable, Aggregate intrinsic value | $ | $ 162
Exercise Price Range 05 [Member] |
Exercise price - lower (in dollars per share) | $ 44.90
Exercise price - higher (in dollars per share) | $ 47
Options outstanding, Number outstanding (in shares) | shares | 10,000
Options outstanding, Weighted average exercise price per share (in dollars per share) | $ 46.95
Options outstanding, Weighted average remaining contractual life (Year) | 5 years 146 days
Options outstanding, Aggregate intrinsic value | $ | $ 13
Options Exercisable, Number exercisable (in shares) | shares | 3,750
Options Exercisable, Weighted average exercise price per share (in dollars per share) | $ 47
Options Exercisable, Weighted average remaining contractual life (Year) | 4 years
Options Exercisable, Aggregate intrinsic value | $ | $ 5
Exercise Price Range 06 [Member] |
Exercise price - lower (in dollars per share) | $ 51.82
Exercise price - higher (in dollars per share) | $ 58.65
Options outstanding, Number outstanding (in shares) | shares | 337,353
Options outstanding, Weighted average exercise price per share (in dollars per share) | $ 55.53
Options outstanding, Weighted average remaining contractual life (Year) | 4 years 73 days
Options outstanding, Aggregate intrinsic value | $ |
Options Exercisable, Number exercisable (in shares) | shares | 176,527
Options Exercisable, Weighted average exercise price per share (in dollars per share) | $ 55.69
Options Exercisable, Weighted average remaining contractual life (Year) | 4 years
Options Exercisable, Aggregate intrinsic value | $ |
Exercise Price Range 07 [Member] |
Exercise price - lower (in dollars per share) | $ 61.33
Exercise price - higher (in dollars per share) | $ 64.10
Options outstanding, Number outstanding (in shares) | shares | 238,347
Options outstanding, Weighted average exercise price per share (in dollars per share) | $ 62.99
Options outstanding, Weighted average remaining contractual life (Year) | 5 years 255 days
Options outstanding, Aggregate intrinsic value | $ |
Options Exercisable, Number exercisable (in shares) | shares | 26,481
Options Exercisable, Weighted average exercise price per share (in dollars per share) | $ 64.10
Options Exercisable, Weighted average remaining contractual life (Year) | 5 years 73 days
Options Exercisable, Aggregate intrinsic value | $ |

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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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