Note 8 - Summary of Stock Options (Details) - Summary of Options Outstanding and Exercisable (USD $)	3 Months Ended
Mar. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in Shares)	2,905,783
Weighted Average Exercise Price, Outstanding	$ 0.90
Weighted Average Remaining Contractual Term	9 years 73 days
Weighted Average Exercise Price, Execisable	$ 2.16
Number Exercisable (in Shares)	608,492
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower	$ 0.46
Range of Exercise Price, Upper	$ 0.47
Number Outstanding (in Shares)	635,000
Weighted Average Exercise Price, Outstanding	$ 0.47
Weighted Average Remaining Contractual Term	9 years 313 days
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Upper	$ 0.60
Number Outstanding (in Shares)	1,881,476
Weighted Average Exercise Price, Outstanding	$ 0.60
Weighted Average Remaining Contractual Term	9 years 6 months
Weighted Average Exercise Price, Execisable	$ 0.60
Number Exercisable (in Shares)	219,185
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Upper	$ 1.24
Number Outstanding (in Shares)	312,373
Weighted Average Exercise Price, Outstanding	$ 1.24
Weighted Average Remaining Contractual Term	7 years 237 days
Weighted Average Exercise Price, Execisable	$ 1.24
Number Exercisable (in Shares)	312,373
Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower	$ 7.00
Range of Exercise Price, Upper	$ 9.00
Number Outstanding (in Shares)	57,603
Weighted Average Exercise Price, Outstanding	$ 8.64
Weighted Average Remaining Contractual Term	2 years 211 days
Weighted Average Exercise Price, Execisable	$ 8.64
Number Exercisable (in Shares)	57,603
Range Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower	$ 12.00
Range of Exercise Price, Upper	$ 18.63
Number Outstanding (in Shares)	19,081
Weighted Average Exercise Price, Outstanding	$ 15.29
Weighted Average Remaining Contractual Term	3 years 25 days
Weighted Average Exercise Price, Execisable	$ 15.29
Number Exercisable (in Shares)	19,081
Range Six [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Upper	$ 37.00
Number Outstanding (in Shares)	250
Weighted Average Exercise Price, Outstanding	$ 37.00
Weighted Average Remaining Contractual Term	2 years 175 days
Weighted Average Exercise Price, Execisable	$ 37.00
Number Exercisable (in Shares)	250

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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)

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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

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-Publisher FASB

-Name Accounting Standards Codification

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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

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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

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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

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-Publisher FASB

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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

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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

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