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Note 15 - Stock Based Compensation - Stock Options Outstanding by Range of Exercise Prices (Details) | 9 Months Ended
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Sep. 30, 2017 $ / shares shares
Range of exercise prices, minimum (in dollars per share) | $ 17.55
Range of exercise prices, maximum (in dollars per share) | $ 48.13
Options outstanding, number of shares (in shares) | shares | 430,820
Options outstanding, weighted average remaining contractual life (Year) | 7 years 43 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 43.82
Options exercisable, number of shares (in shares) | shares | 324,622
Options exercisable, weighted average exercise price (in dollars per share) | $ 43.23
Range01 [Member] |
Range of exercise prices, minimum (in dollars per share) | 17.55
Range of exercise prices, maximum (in dollars per share) | $ 21.13
Options outstanding, number of shares (in shares) | shares | 3,950
Options outstanding, weighted average remaining contractual life (Year) | 2 years 277 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 19.38
Options exercisable, number of shares (in shares) | shares | 3,950
Options exercisable, weighted average exercise price (in dollars per share) | $ 19.38
Range 02 [Member] |
Range of exercise prices, minimum (in dollars per share) | 21.29
Range of exercise prices, maximum (in dollars per share) | $ 21.29
Options outstanding, number of shares (in shares) | shares | 3,700
Options outstanding, weighted average remaining contractual life (Year) | 5 years 109 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 21.29
Options exercisable, number of shares (in shares) | shares | 2,500
Options exercisable, weighted average exercise price (in dollars per share) | $ 21.29
Range 03 [Member] |
Range of exercise prices, minimum (in dollars per share) | 21.51
Range of exercise prices, maximum (in dollars per share) | $ 21.51
Options outstanding, number of shares (in shares) | shares | 1,250
Options outstanding, weighted average remaining contractual life (Year) | 2 years 109 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 21.51
Options exercisable, number of shares (in shares) | shares | 1,250
Options exercisable, weighted average exercise price (in dollars per share) | $ 21.51
Range 04 [Member] |
Range of exercise prices, minimum (in dollars per share) | 30.31
Range of exercise prices, maximum (in dollars per share) | $ 30.31
Options outstanding, number of shares (in shares) | shares | 22,180
Options outstanding, weighted average remaining contractual life (Year) | 229 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 30.31
Options exercisable, number of shares (in shares) | shares | 22,180
Options exercisable, weighted average exercise price (in dollars per share) | $ 30.31
Range 05 [Member] |
Range of exercise prices, minimum (in dollars per share) | 40.57
Range of exercise prices, maximum (in dollars per share) | $ 40.57
Options outstanding, number of shares (in shares) | shares | 40,490
Options outstanding, weighted average remaining contractual life (Year) | 7 years 91 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 40.57
Options exercisable, number of shares (in shares) | shares | 40,490
Options exercisable, weighted average exercise price (in dollars per share) | $ 40.57
Range 06 [Member] |
Range of exercise prices, minimum (in dollars per share) | 40.72
Range of exercise prices, maximum (in dollars per share) | $ 40.72
Options outstanding, number of shares (in shares) | shares | 1,500
Options outstanding, weighted average remaining contractual life (Year) | 7 years 47 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 40.72
Options exercisable, number of shares (in shares) | shares | 600
Options exercisable, weighted average exercise price (in dollars per share) | $ 40.72
Range 07 [Member] |
Range of exercise prices, minimum (in dollars per share) | 44.40
Range of exercise prices, maximum (in dollars per share) | $ 44.40
Options outstanding, number of shares (in shares) | shares | 49,870
Options outstanding, weighted average remaining contractual life (Year) | 7 years 91 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 44.40
Options exercisable, number of shares (in shares) | shares | 37,144
Options exercisable, weighted average exercise price (in dollars per share) | $ 44.40
Range 08 [Member] |
Range of exercise prices, minimum (in dollars per share) | 45.50
Range of exercise prices, maximum (in dollars per share) | $ 45.50
Options outstanding, number of shares (in shares) | shares | 246,485
Options outstanding, weighted average remaining contractual life (Year) | 7 years 226 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 45.50
Options exercisable, number of shares (in shares) | shares | 193,025
Options exercisable, weighted average exercise price (in dollars per share) | $ 45.50
Range 09 [Member] |
Range of exercise prices, minimum (in dollars per share) | 47.02
Range of exercise prices, maximum (in dollars per share) | $ 47.02
Options outstanding, number of shares (in shares) | shares | 58,090
Options outstanding, weighted average remaining contractual life (Year) | 7 years 288 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 47.02
Options exercisable, number of shares (in shares) | shares | 20,838
Options exercisable, weighted average exercise price (in dollars per share) | $ 47.02
Range 10 [Member] |
Range of exercise prices, minimum (in dollars per share) | 48.13
Range of exercise prices, maximum (in dollars per share) | $ 48.13
Options outstanding, number of shares (in shares) | shares | 3,305
Options outstanding, weighted average remaining contractual life (Year) | 7 years 350 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 48.13
Options exercisable, number of shares (in shares) | shares | 2,645
Options exercisable, weighted average exercise price (in dollars per share) | $ 48.13

X
- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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