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Note 13 - Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Quarterly Financial Information [Table Text Block] |
(in thousands except per share data) |  |  |
|  | Quarter Ended |
|  | March 31, 2012 |  |  | June 30, 2012 |  |  | September 30, 2012 |  |  | December 31, 2012 |
Revenues |  | $ | 31 |  |  | $ | 6 |  |  | $ | 287 |  |  | $ | 38 |
Gross profit |  |  | 31 |  |  |  | 4 |  |  |  | (6 | ) |  |  | (188 | )
Operating loss |  |  | (2,885 | ) |  |  | (2,986 | ) |  |  | (3,068 | ) |  |  | (4,129 | )
Net loss |  |  | (4,448 | ) |  |  | (4,584 | ) |  |  | (4,736 | ) |  |  | (5,806 | )
Basic and diluted net loss per common share |  | $ | (0.29 | ) |  | $ | (0.30 | ) |  | $ | (0.31 | ) |  | $ | (0.38 | )
|  | Quarter Ended |
|  | March 31, 2011 |  |  | June 30, 2011 |  |  | September 30, 2011 |  |  | December 31, 2011 |
Revenues |  | $ | 457 |  |  | $ | 40 |  |  | $ | 121 |  |  | $ | 401 |
Gross profit |  |  | 25 |  |  |  | 22 |  |  |  | (145 | ) |  |  | (324 | )
Operating loss |  |  | (3,029 | ) |  |  | (2,288 | ) |  |  | (2,704 | ) |  |  | (3,213 | )
Net loss |  |  | (4,254 | ) |  |  | (3,728 | ) |  |  | (4,105 | ) |  |  | (4,750 | )
Basic and diluted net loss per common share |  | $ | (0.31 | ) |  | $ | (0.27 | ) |  | $ | (0.29 | ) |  | $ | (0.33 | )

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration