Note 13 - Quarterly Financial Information (Unaudited) (Details) - Quarterly Financial Information (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information [Abstract]
Revenues	$ 16us-gaap_Revenues	$ 305us-gaap_Revenues	$ 11us-gaap_Revenues	$ 4us-gaap_Revenues	$ 111us-gaap_Revenues	$ 182us-gaap_Revenues	$ 4us-gaap_Revenues	$ 4us-gaap_Revenues	$ 336us-gaap_Revenues	$ 301us-gaap_Revenues	$ 362us-gaap_Revenues
Gross profit (loss)	(59)us-gaap_GrossProfit	23us-gaap_GrossProfit	11us-gaap_GrossProfit	4us-gaap_GrossProfit	(152)us-gaap_GrossProfit	(110)us-gaap_GrossProfit	4us-gaap_GrossProfit	4us-gaap_GrossProfit
Operating loss	(2,883)us-gaap_OperatingIncomeLoss	(2,375)us-gaap_OperatingIncomeLoss	(2,453)us-gaap_OperatingIncomeLoss	(2,648)us-gaap_OperatingIncomeLoss	(4,050)us-gaap_OperatingIncomeLoss	(3,107)us-gaap_OperatingIncomeLoss	(2,871)us-gaap_OperatingIncomeLoss	(3,944)us-gaap_OperatingIncomeLoss	(10,359)us-gaap_OperatingIncomeLoss	(13,972)us-gaap_OperatingIncomeLoss	(13,068)us-gaap_OperatingIncomeLoss
Net loss	$ (5,106)	$ (4,566)	$ (4,515)	$ (4,694)	$ (5,980)	$ (4,797)	$ (4,461)	$ (7,439)	$ (18,881)	$ (22,677)	$ (19,574)
Basic and diluted net loss per common share (in Dollars per share)	$ (0.30)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.28)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.28)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.29)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.38)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.31)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.29)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.48)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.15)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.46)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.27)us-gaap_EarningsPerShareBasicAndDiluted

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

No definition available.

+ Details

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

+ Details

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- Definition

Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256

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The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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