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Note 15 - Stock-based Compensation - Options Outstanding (Details) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Number outstanding (in shares) | shares | 513,554
Number exercisable (in shares) | shares | 354,269
Range 1 [Member] |
Exercise price range, lower range (in dollars per share) | $ 7.99
Exercise price range, upper range (in dollars per share) | $ 8.93
Number outstanding (in shares) | shares | 27,850
Weighted average remaining contractual life (Year) | 3 years 21 days
Weighted average exercise price options outstanding (in dollars per share) | $ 8.09
Number exercisable (in shares) | shares | 27,850
Weighted average exercise price options exercisable (in dollars per share) | $ 8.09
Range 2 [Member] |
Exercise price range, lower range (in dollars per share) | 9
Exercise price range, upper range (in dollars per share) | $ 9.30
Number outstanding (in shares) | shares | 148,755
Weighted average remaining contractual life (Year) | 2 years 281 days
Weighted average exercise price options outstanding (in dollars per share) | $ 9.22
Number exercisable (in shares) | shares | 147,955
Weighted average exercise price options exercisable (in dollars per share) | $ 9.22
Range 3 [Member] |
Exercise price range, lower range (in dollars per share) | 15
Exercise price range, upper range (in dollars per share) | $ 16.85
Number outstanding (in shares) | shares | 90,668
Weighted average remaining contractual life (Year) | 4 years 215 days
Weighted average exercise price options outstanding (in dollars per share) | $ 15.63
Number exercisable (in shares) | shares | 79,369
Weighted average exercise price options exercisable (in dollars per share) | $ 15.64
Range 4 [Member] |
Exercise price range, lower range (in dollars per share) | 17.10
Exercise price range, upper range (in dollars per share) | $ 18
Number outstanding (in shares) | shares | 132,816
Weighted average remaining contractual life (Year) | 6 years 208 days
Weighted average exercise price options outstanding (in dollars per share) | $ 17.31
Number exercisable (in shares) | shares | 81,521
Weighted average exercise price options exercisable (in dollars per share) | $ 17.26
Range 5 [Member] |
Exercise price range, lower range (in dollars per share) | 21.71
Exercise price range, upper range (in dollars per share) | $ 31.53
Number outstanding (in shares) | shares | 70,215
Weighted average remaining contractual life (Year) | 8 years 29 days
Weighted average exercise price options outstanding (in dollars per share) | $ 22.63
Number exercisable (in shares) | shares | 16,273
Weighted average exercise price options exercisable (in dollars per share) | $ 22.64
Range 6 [Member] |
Exercise price range, upper range (in dollars per share) | $ 48.50
Number outstanding (in shares) | shares | 43,250
Weighted average remaining contractual life (Year) | 9 years 73 days
Weighted average exercise price options outstanding (in dollars per share) | $ 43.86
Number exercisable (in shares) | shares | 1,301
Weighted average exercise price options exercisable (in dollars per share) | $ 42.75

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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://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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