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Note 6 - Share-based Compensation - Stock Options Outstanding (Details) | 9 Months Ended
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Sep. 30, 2018 $ / shares shares
Lower range of exercise prices on options (in dollars per share) | $ 3.82
Upper range of exercise prices on options (in dollars per share) | $ 24.28
Options outstanding (in shares) | shares | 711,029
Weighted average remaining contractual life on options (Year) | 3 years 43 days
Weighted average exercise price on options (in dollars per share) | $ 15.36
Exercise Price Range 1 [Member] |
Lower range of exercise prices on options (in dollars per share) | 3.82
Upper range of exercise prices on options (in dollars per share) | $ 5.88
Options outstanding (in shares) | shares | 89,000
Weighted average remaining contractual life on options (Year) | 2 years 313 days
Weighted average exercise price on options (in dollars per share) | $ 5.33
Exercise Price Range 2 [Member] |
Lower range of exercise prices on options (in dollars per share) | 7.36
Upper range of exercise prices on options (in dollars per share) | $ 10.38
Options outstanding (in shares) | shares | 126,767
Weighted average remaining contractual life on options (Year) | 1 year 200 days
Weighted average exercise price on options (in dollars per share) | $ 7.85
Exercise Price Range 3 [Member] |
Lower range of exercise prices on options (in dollars per share) | 16.35
Upper range of exercise prices on options (in dollars per share) | $ 18.66
Options outstanding (in shares) | shares | 352,232
Weighted average remaining contractual life on options (Year) | 3 years 54 days
Weighted average exercise price on options (in dollars per share) | $ 17.49
Exercise Price Range 4 [Member] |
Lower range of exercise prices on options (in dollars per share) | 21.63
Upper range of exercise prices on options (in dollars per share) | $ 24.28
Options outstanding (in shares) | shares | 143,030
Weighted average remaining contractual life on options (Year) | 4 years 211 days
Weighted average exercise price on options (in dollars per share) | $ 23.03

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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 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 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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