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Note 15 - Stock-based Compensation - Options Outstanding (Details) | 12 Months Ended
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Dec. 31, 2018 $ / shares shares
Number outstanding (in shares) | shares | 469,572
Number exercisable (in shares) | shares | 358,270
$7.99 to $8.93 |
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 | 24,175
Weighted average remaining contractual life (Year) | 2 years 26 days
Weighted average exercise price options outstanding (in dollars per share) | $ 8.10
Number exercisable (in shares) | shares | 24,175
Weighted average exercise price options exercisable (in dollars per share) | $ 8.10
$9.00 to $9.30 |
Exercise price range, lower range (in dollars per share) | 9.00
Exercise price range, upper range (in dollars per share) | $ 9.30
Number outstanding (in shares) | shares | 121,724
Weighted average remaining contractual life (Year) | 2 years 1 month 6 days
Weighted average exercise price options outstanding (in dollars per share) | $ 9.21
Number exercisable (in shares) | shares | 121,724
Weighted average exercise price options exercisable (in dollars per share) | $ 9.21
$15.08 to $16.13 |
Exercise price range, lower range (in dollars per share) | 15.08
Exercise price range, upper range (in dollars per share) | $ 16.13
Number outstanding (in shares) | shares | 74,703
Weighted average remaining contractual life (Year) | 4 years 2 months 27 days
Weighted average exercise price options outstanding (in dollars per share) | $ 15.63
Number exercisable (in shares) | shares | 72,303
Weighted average exercise price options exercisable (in dollars per share) | $ 15.64
$17.10 to $18.00 |
Exercise price range, lower range (in dollars per share) | 17.10
Exercise price range, upper range (in dollars per share) | $ 18.00
Number outstanding (in shares) | shares | 125,137
Weighted average remaining contractual life (Year) | 5 years 6 months 22 days
Weighted average exercise price options outstanding (in dollars per share) | $ 17.31
Number exercisable (in shares) | shares | 99,573
Weighted average exercise price options exercisable (in dollars per share) | $ 17.29
$21.71 to $31.53 |
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 | 66,291
Weighted average remaining contractual life (Year) | 7 years 1 month 10 days
Weighted average exercise price options outstanding (in dollars per share) | $ 22.92
Number exercisable (in shares) | shares | 29,633
Weighted average exercise price options exercisable (in dollars per share) | $ 22.64
$42.65 to $48.50 |
Exercise price range, lower range (in dollars per share) | 42.65
Exercise price range, upper range (in dollars per share) | $ 48.50
Number outstanding (in shares) | shares | 57,542
Weighted average remaining contractual life (Year) | 8 years 5 months 16 days
Weighted average exercise price options outstanding (in dollars per share) | $ 43.94
Number exercisable (in shares) | shares | 10,862
Weighted average exercise price options exercisable (in dollars per share) | $ 43.79

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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=109197908&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=109197908&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=109197908&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=109197908&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=109197908&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://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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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