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Note 14 - Stock Option Plans - Summary of Exercise Prices, Weighted Average Remaining Contractual Life and Intrinsic Values of Outstanding Options (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / shares shares
Number outstanding (in shares) | shares | 754,497
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 49.94
Weighted average remaining contractual life, options outstanding (Year) | 4 years 146 days
Aggregate intrinsic value, options outstanding | $ | $ 9,224
Number exercisable (in shares) | shares | 356,066
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 40.64
Weighted average remaining contractual life, options exercisable (Year) | 3 years 73 days
Aggregate intrinsic value, options exercisable | $ | $ 7,590
Exercise Price Range 01 [Member] |
Exercise price - lower (in dollars per share) | $ 8.56
Exercise price - higher (in dollars per share) | $ 8.56
Number outstanding (in shares) | shares | 19,535
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 8.56
Weighted average remaining contractual life, options outstanding (Year) | 146 days
Aggregate intrinsic value, options outstanding | $ | $ 1,040
Number exercisable (in shares) | shares | 19,535
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 8.56
Weighted average remaining contractual life, options exercisable (Year) | 146 days
Aggregate intrinsic value, options exercisable | $ | $ 1,039
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 | 74,465
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 16.42
Weighted average remaining contractual life, options outstanding (Year) | 1 year 255 days
Aggregate intrinsic value, options outstanding | $ | $ 3,378
Number exercisable (in shares) | shares | 73,215
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 16.36
Weighted average remaining contractual life, options exercisable (Year) | 1 year 255 days
Aggregate intrinsic value, options exercisable | $ | $ 3,326
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 | 58,750
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 23.73
Weighted average remaining contractual life, options outstanding (Year) | 2 years 36 days
Aggregate intrinsic value, options outstanding | $ | $ 2,236
Number exercisable (in shares) | shares | 48,750
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 24.27
Weighted average remaining contractual life, options exercisable (Year) | 1 year 328 days
Aggregate intrinsic value, options exercisable | $ | $ 1,829
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) | 3 years 146 days
Aggregate intrinsic value, options outstanding | $ | $ 372
Number exercisable (in shares) | shares | 11,875
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 36.02
Weighted average remaining contractual life, options exercisable (Year) | 3 years 109 days
Aggregate intrinsic value, options exercisable | $ | $ 306
Exercise Price Range 05 [Member] |
Exercise price - lower (in dollars per share) | $ 47
Exercise price - higher (in dollars per share) | $ 47
Number outstanding (in shares) | shares | 5,000
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 47
Weighted average remaining contractual life, options outstanding (Year) | 4 years 73 days
Aggregate intrinsic value, options outstanding | $ | $ 74
Number exercisable (in shares) | shares | 2,500
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 47
Weighted average remaining contractual life, options exercisable (Year) | 4 years 73 days
Aggregate intrinsic value, options exercisable | $ | $ 37
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 | 340,078
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 55.53
Weighted average remaining contractual life, options outstanding (Year) | 4 years 182 days
Aggregate intrinsic value, options outstanding | $ | $ 2,124
Number exercisable (in shares) | shares | 172,802
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 55.68
Weighted average remaining contractual life, options exercisable (Year) | 4 years 73 days
Aggregate intrinsic value, options exercisable | $ | $ 1,053
Exercise Price Range 07 [Member] |
Exercise price - lower (in dollars per share) | $ 61.33
Exercise price - higher (in dollars per share) | $ 64.10
Number outstanding (in shares) | shares | 242,294
Weighted average exercise price per share, options outstanding (in dollars per share) | $ 62.99
Weighted average remaining contractual life, options outstanding (Year) | 6 years
Aggregate intrinsic value, options outstanding | $ |
Number exercisable (in shares) | shares | 27,389
Weighted average exercise price per share, options exercisable (in dollars per share) | $ 64.10
Weighted average remaining contractual life, options exercisable (Year) | 5 years 146 days
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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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