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Note 10 - Stock-based Compensation - Stock Options Vested and Expected to Vest (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares | 1,861,952
Shares of common stock, vested, weighted-average per share exercise price (in dollars per share) | $ / shares | $ 4.22
Shares of common stock, vested, weighted-average remaining contractual life | 6 years 255 days
Shares of common stock, vested, aggregate intrinsic value | $ | $ 0
Shares of common stock, expected to vest (in shares) | shares | 1,149,545
Shares of common stock, expected to vest, weighted-average per share exercise price (in dollars per share) | $ / shares | $ 3.69
Shares of common stock, expected to vest, weighted-average remaining contractual life | 8 years 182 days
Shares of common stock, expected to vest, aggregate intrinsic value | $ | $ 0
Shares of common stock, total (in shares) | shares | 3,011,498
Shares of common stock, total, weighted-average per share exercise price (in dollars per share) | $ / shares | $ 4.01
Shares of common stock, total, weighted-average remaining contractual life | 7 years 146 days
Shares of common stock, total, aggregate intrinsic value | $ | $ 0

X
- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of expected to vest options outstanding. + References No definition available. + Details
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- Definition As of the balance sheet date, the number of shares into which expected to vest stock options outstanding can be converted under the option plan. + References No definition available. + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are expected to vest. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + 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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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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