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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) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021
Number outstanding (in shares) | 883,254 |
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 64.37 |
Weighted average remaining contractual life, options outstanding (Year) | 4 years 3 months 18 days |
Aggregate intrinsic value, options outstanding | $ 6,456 |
Number exercisable (in shares) | 405,846 | 378,258
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ 56.40 |
Weighted average remaining contractual life, options exercisable (Year) | 2 years 10 months 24 days |
Aggregate intrinsic value, options exercisable | $ 4,888 |
Exercise Price Range 01 [Member] |  |
Exercise price - lower limit (in dollars per share) | $ 19.95 |
Exercise price - upper limit (in dollars per share) | $ 19.95 |
Number outstanding (in shares) | 7,000 |
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 19.95 |
Weighted average remaining contractual life, options outstanding (Year) | 10 months 24 days |
Aggregate intrinsic value, options outstanding | $ 338 |
Number exercisable (in shares) | 7,000 |
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ 19.95 |
Weighted average remaining contractual life, options exercisable (Year) | 10 months 24 days |
Aggregate intrinsic value, options exercisable | $ 338 |
Exercise Price Range 02 [Member] |  |
Exercise price - lower limit (in dollars per share) | $ 21.10 |
Exercise price - upper limit (in dollars per share) | $ 21.10 |
Number outstanding (in shares) | 20,892 |
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 21.10 |
Weighted average remaining contractual life, options outstanding (Year) | 9 months 18 days |
Aggregate intrinsic value, options outstanding | $ 986 |
Number exercisable (in shares) | 20,892 |
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ 21.10 |
Weighted average remaining contractual life, options exercisable (Year) | 9 months 18 days |
Aggregate intrinsic value, options exercisable | $ 986 |
Exercise Price Range 03 [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) | 11,000 |
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 47.35 |
Weighted average remaining contractual life, options outstanding (Year) | 3 years 7 months 6 days |
Aggregate intrinsic value, options outstanding | $ 231 |
Number exercisable (in shares) | 6,000 |
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ 47.17 |
Weighted average remaining contractual life, options exercisable (Year) | 2 years 6 months |
Aggregate intrinsic value, options exercisable | $ 127 |
Exercise Price Range 04 [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) | 219,671 |
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 55.59 |
Weighted average remaining contractual life, options outstanding (Year) | 2 years 4 months 24 days |
Aggregate intrinsic value, options outstanding | $ 2,793 |
Number exercisable (in shares) | 209,396 |
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ 55.60 |
Weighted average remaining contractual life, options exercisable (Year) | 2 years 2 months 12 days |
Aggregate intrinsic value, options exercisable | $ 2,660 |
Exercise Price Range 05 [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) | 335,716 |
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 62.03 |
Weighted average remaining contractual life, options outstanding (Year) | 4 years 3 months 18 days |
Aggregate intrinsic value, options outstanding | $ 2,108 |
Number exercisable (in shares) | 149,858 |
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ 63.13 |
Weighted average remaining contractual life, options exercisable (Year) | 4 years |
Aggregate intrinsic value, options exercisable | $ 777 |
Exercise Price Range 06 [Member] |  |
Exercise price - lower limit (in dollars per share) | $ 70.13 |
Exercise price - upper limit (in dollars per share) | $ 79.51 |
Number outstanding (in shares) | 272,475 |
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 78.47 |
Weighted average remaining contractual life, options outstanding (Year) | 6 years |
Aggregate intrinsic value, options outstanding | $ 0 |
Number exercisable (in shares) | 12,700 |
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ 72.61 |
Weighted average remaining contractual life, options exercisable (Year) | 5 years 8 months 12 days |
Aggregate intrinsic value, options exercisable | $ 0 |
Exercise Price Range 07 [Member] |  |
Exercise price - lower limit (in dollars per share) | $ 80.61 |
Exercise price - upper limit (in dollars per share) | $ 82.07 |
Number outstanding (in shares) | 16,500 |
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 81.27 |
Weighted average remaining contractual life, options outstanding (Year) | 6 years 6 months |
Aggregate intrinsic value, options outstanding | $ 0 |
Number exercisable (in shares) | 0 |
Weighted average remaining contractual life, options exercisable (in dollars per share) | $ 0 |
Aggregate intrinsic value, options exercisable | $ 0 |

X
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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