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Note 14 - Employee Benefit Plans - Stock Options Outstanding by Range of Exercise Prices (Details) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Range of exercise prices, minimum (in dollars per share) | $ 8.78
Range of exercise prices, maximum (in dollars per share) | $ 24.07
Options outstanding, number of shares (in shares) | shares | 812
Options outstanding, weighted average remaining contractual life (Year) | 6 years 302 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 21.98
Options exercisable, number of shares (in shares) | shares | 711
Options exercisable, weighted average exercise price (in dollars per share) | $ 21.85
Range01 [Member] |
Range of exercise prices, minimum (in dollars per share) | 8.78
Range of exercise prices, maximum (in dollars per share) | $ 10.57
Options outstanding, number of shares (in shares) | shares | 7
Options outstanding, weighted average remaining contractual life (Year) | 2 years 131 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 9.64
Options exercisable, number of shares (in shares) | shares | 7
Options exercisable, weighted average exercise price (in dollars per share) | $ 9.64
Range 02 [Member] |
Range of exercise prices, minimum (in dollars per share) | 10.65
Range of exercise prices, maximum (in dollars per share) | $ 10.65
Options outstanding, number of shares (in shares) | shares | 7
Options outstanding, weighted average remaining contractual life (Year) | 5 years 21 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 10.65
Options exercisable, number of shares (in shares) | shares | 4
Options exercisable, weighted average exercise price (in dollars per share) | $ 10.65
Range 03 [Member] |
Range of exercise prices, minimum (in dollars per share) | 10.76
Range of exercise prices, maximum (in dollars per share) | $ 10.76
Options outstanding, number of shares (in shares) | shares | 3
Options outstanding, weighted average remaining contractual life (Year) | 2 years 18 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 10.76
Options exercisable, number of shares (in shares) | shares | 3
Options exercisable, weighted average exercise price (in dollars per share) | $ 10.76
Range 04 [Member] |
Range of exercise prices, minimum (in dollars per share) | 15.16
Range of exercise prices, maximum (in dollars per share) | $ 15.16
Options outstanding, number of shares (in shares) | shares | 36
Options outstanding, weighted average remaining contractual life (Year) | 149 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 15.16
Options exercisable, number of shares (in shares) | shares | 36
Options exercisable, weighted average exercise price (in dollars per share) | $ 15.16
Range 05 [Member] |
Range of exercise prices, minimum (in dollars per share) | 20.29
Range of exercise prices, maximum (in dollars per share) | $ 20.29
Options outstanding, number of shares (in shares) | shares | 78
Options outstanding, weighted average remaining contractual life (Year) | 7 years
Options outstanding, weighted average exercise price (in dollars per share) | $ 20.29
Options exercisable, number of shares (in shares) | shares | 78
Options exercisable, weighted average exercise price (in dollars per share) | $ 20.29
Range 06 [Member] |
Range of exercise prices, minimum (in dollars per share) | 20.36
Range of exercise prices, maximum (in dollars per share) | $ 20.36
Options outstanding, number of shares (in shares) | shares | 3
Options outstanding, weighted average remaining contractual life (Year) | 6 years 321 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 20.36
Options exercisable, number of shares (in shares) | shares | 2
Options exercisable, weighted average exercise price (in dollars per share) | $ 20.36
Range 07 [Member] |
Range of exercise prices, minimum (in dollars per share) | 22.20
Range of exercise prices, maximum (in dollars per share) | $ 22.20
Options outstanding, number of shares (in shares) | shares | 82
Options outstanding, weighted average remaining contractual life (Year) | 6 years 339 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 22.20
Options exercisable, number of shares (in shares) | shares | 57
Options exercisable, weighted average exercise price (in dollars per share) | $ 22.20
Range 08 [Member] |
Range of exercise prices, minimum (in dollars per share) | 22.75
Range of exercise prices, maximum (in dollars per share) | $ 22.75
Options outstanding, number of shares (in shares) | shares | 481
Options outstanding, weighted average remaining contractual life (Year) | 7 years 54 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 22.75
Options exercisable, number of shares (in shares) | shares | 481
Options exercisable, weighted average exercise price (in dollars per share) | $ 22.75
Range 09 [Member] |
Range of exercise prices, minimum (in dollars per share) | 23.51
Range of exercise prices, maximum (in dollars per share) | $ 23.51
Options outstanding, number of shares (in shares) | shares | 108
Options outstanding, weighted average remaining contractual life (Year) | 7 years 299 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 23.51
Options exercisable, number of shares (in shares) | shares | 36
Options exercisable, weighted average exercise price (in dollars per share) | $ 23.51
Range 10 [Member] |
Range of exercise prices, minimum (in dollars per share) | 24.07
Range of exercise prices, maximum (in dollars per share) | $ 24.07
Options outstanding, number of shares (in shares) | shares | 7
Options outstanding, weighted average remaining contractual life (Year) | 7 years 259 days
Options outstanding, weighted average exercise price (in dollars per share) | $ 24.07
Options exercisable, number of shares (in shares) | shares | 7
Options exercisable, weighted average exercise price (in dollars per share) | $ 24.07

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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