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Note 7 - Exercise Price Ranges (Details) | 12 Months Ended
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Dec. 31, 2015 $ / shares shares
Exercise Price Range 1 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options | shares | 702,903
Range of exercise prices, lower limit (in dollars per share) | $ 3.80
Range of exercise prices, upper limit (in dollars per share) | $ 7
Options outstanding, weighted-average remaining contractual life | 6 years 113 days
Options outstanding, weighted-average exercise price (in dollars per share) | $ 5.92
Options exercisable (in shares) | shares | 466,373
Options exercisable, weighted-average exercise price (in dollars per share) | $ 5.38
Exercise Price Range 2 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options | shares | 2,302,688
Options outstanding, weighted-average remaining contractual life | 7 years 120 days
Options outstanding, weighted-average exercise price (in dollars per share) | $ 7.20
Options exercisable (in shares) | shares | 711,687
Options exercisable, weighted-average exercise price (in dollars per share) | $ 7.20
Exercise Price Range 3 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options | shares | 2,047,712
Range of exercise prices, lower limit (in dollars per share) | $ 7.61
Range of exercise prices, upper limit (in dollars per share) | $ 9.05
Options outstanding, weighted-average remaining contractual life | 8 years 109 days
Options outstanding, weighted-average exercise price (in dollars per share) | $ 8.91
Options exercisable (in shares) | shares | 711,561
Options exercisable, weighted-average exercise price (in dollars per share) | $ 8.84
Exercise Price Range 4 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options | shares | 1,702,732
Range of exercise prices, lower limit (in dollars per share) | $ 9.20
Range of exercise prices, upper limit (in dollars per share) | $ 28.30
Options outstanding, weighted-average remaining contractual life | 7 years 83 days
Options outstanding, weighted-average exercise price (in dollars per share) | $ 14.89
Options exercisable (in shares) | shares | 692,974
Options exercisable, weighted-average exercise price (in dollars per share) | $ 12.17
Exercise Price Range 5 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options | shares | 1,678,953
Range of exercise prices, lower limit (in dollars per share) | $ 28.73
Range of exercise prices, upper limit (in dollars per share) | $ 128
Options outstanding, weighted-average remaining contractual life | 9 years 259 days
Options outstanding, weighted-average exercise price (in dollars per share) | $ 30.23
Options exercisable (in shares) | shares | 4,797
Options exercisable, weighted-average exercise price (in dollars per share) | $ 42.60
Exercise Price Range 6 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options | shares | 8,434,988
Range of exercise prices, lower limit (in dollars per share) | $ 3.80
Range of exercise prices, upper limit (in dollars per share) | $ 128
Options outstanding, weighted-average remaining contractual life | 7 years 343 days
Options outstanding, weighted-average exercise price (in dollars per share) | $ 13.64
Options exercisable (in shares) | shares | 2,587,392
Options exercisable, weighted-average exercise price (in dollars per share) | $ 8.72
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options | shares | 8,434,988

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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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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