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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, 2021 USD ($) $ / shares shares
Number outstanding (in shares) | shares | 956,234
Weighted average exercise price per share, options outstanding (in dollars per share) | $ / shares | $ 62.88
Weighted average remaining contractual life, options outstanding (Year) | 4 years 7 months 6 days
Aggregate intrinsic value, options outstanding | $ | $ 15,479
Number exercisable (in shares) | shares | 470,317
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ / shares | $ 54.87
Weighted average remaining contractual life, options exercisable (Year) | 3 years 2 months 12 days
Aggregate intrinsic value, options exercisable | $ | $ 11,326
Exercise Price Range 01 [Member] |
Number outstanding (in shares) | shares | 24,500
Weighted average exercise price per share, options outstanding (in dollars per share) | $ / shares | $ 19.56
Weighted average remaining contractual life, options outstanding (Year) | 7 months 6 days
Aggregate intrinsic value, options outstanding | $ | $ 1,455
Number exercisable (in shares) | shares | 24,500
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ / shares | $ 19.56
Weighted average remaining contractual life, options exercisable (Year) | 7 months 6 days
Aggregate intrinsic value, options exercisable | $ | $ 1,455
Exercise Price Range 02 [Member] |
Number outstanding (in shares) | shares | 20,892
Weighted average exercise price per share, options outstanding (in dollars per share) | $ / shares | $ 21.10
Weighted average remaining contractual life, options outstanding (Year) | 1 year 3 months 18 days
Aggregate intrinsic value, options outstanding | $ | $ 1,209
Number exercisable (in shares) | shares | 20,892
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ / shares | $ 21.10
Weighted average remaining contractual life, options exercisable (Year) | 1 year 3 months 18 days
Aggregate intrinsic value, options exercisable | $ | $ 1,209
Exercise Price Range 03 [Member] |
Number outstanding (in shares) | shares | 4,375
Weighted average exercise price per share, options outstanding (in dollars per share) | $ / shares | $ 37.35
Weighted average remaining contractual life, options outstanding (Year) | 3 months 18 days
Aggregate intrinsic value, options outstanding | $ | $ 182
Number exercisable (in shares) | shares | 4,375
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ / shares | $ 37.35
Weighted average remaining contractual life, options exercisable (Year) | 3 months 18 days
Aggregate intrinsic value, options exercisable | $ | $ 182
Exercise Price Range 04 [Member] |
Number outstanding (in shares) | shares | 13,000
Weighted average exercise price per share, options outstanding (in dollars per share) | $ / shares | $ 47.36
Weighted average remaining contractual life, options outstanding (Year) | 4 years 3 months 18 days
Aggregate intrinsic value, options outstanding | $ | $ 411
Number exercisable (in shares) | shares | 7,000
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ / shares | $ 47.29
Weighted average remaining contractual life, options exercisable (Year) | 3 years 3 months 18 days
Aggregate intrinsic value, options exercisable | $ | $ 222
Exercise Price Range 05 [Member] |
Number outstanding (in shares) | shares | 253,656
Weighted average exercise price per share, options outstanding (in dollars per share) | $ / shares | $ 55.57
Weighted average remaining contractual life, options outstanding (Year) | 2 years 9 months 18 days
Aggregate intrinsic value, options outstanding | $ | $ 5,930
Number exercisable (in shares) | shares | 239,131
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ / shares | $ 55.59
Weighted average remaining contractual life, options exercisable (Year) | 2 years 8 months 12 days
Aggregate intrinsic value, options exercisable | $ | $ 5,586
Exercise Price Range 06 [Member] |
Number outstanding (in shares) | shares | 360,661
Weighted average exercise price per share, options outstanding (in dollars per share) | $ / shares | $ 62.02
Weighted average remaining contractual life, options outstanding (Year) | 4 years 9 months 18 days
Aggregate intrinsic value, options outstanding | $ | $ 6,107
Number exercisable (in shares) | shares | 164,219
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ / shares | $ 63.07
Weighted average remaining contractual life, options exercisable (Year) | 4 years 6 months
Aggregate intrinsic value, options exercisable | $ | $ 2,607
Exercise Price Range 07 [Member] |
Number outstanding (in shares) | shares | 279,150
Weighted average exercise price per share, options outstanding (in dollars per share) | $ / shares | $ 78.69
Weighted average remaining contractual life, options outstanding (Year) | 6 years 4 months 24 days
Aggregate intrinsic value, options outstanding | $ | $ 185
Number exercisable (in shares) | shares | 10,200
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ / shares | $ 72.64
Weighted average remaining contractual life, options exercisable (Year) | 6 years 2 months 12 days
Aggregate intrinsic value, options exercisable | $ | $ 65

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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 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 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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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are 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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