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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2013
Accounting Policies [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Basic and diluted loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (1,651 | ) |  | $ | (928 | ) |  | $ | (3,758 | ) |  | $ | (3,695 | )
Basic and diluted loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding |  |  | 49,158 |  |  |  | 44,542 |  |  |  | 46,712 |  |  |  | 40,241 |
Basic and diluted net loss per share |  | $ | (0.03 | ) |  | $ | (0.02 | ) |  | $ | (0.08 | ) |  | $ | (0.09 | )
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Cost of sales |  | $ | 1 |  |  | $ | - |  |  | $ | 2 |  |  | $ | - |
Research and development |  |  | 11 |  |  |  | 7 |  |  |  | 26 |  |  |  | 19 |
Sales and marketing |  |  | 8 |  |  |  | 6 |  |  |  | 23 |  |  |  | 20 |
General and administrative |  |  | 33 |  |  |  | 29 |  |  |  | 98 |  |  |  | 107 |
Total stock-based compensation |  | $ | 53 |  |  | $ | 42 |  |  | $ | 149 |  |  | $ | 146 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Nine months ended September 30, |
|  | 2013 |  |  | 2012 |
Fair value of options issued |  | $ | 0.17 |  |  | $ | 0.15 |
Exercise price |  | $ | 0.25 |  |  | $ | 0.27 |
Expected life of option (years) |  |  | 7.2 |  |  |  | 5.6 |
Risk-free interest rate |  |  | 1.3 | % |  |  | 0.8 | %
Expected volatility |  |  | 90.2 | % |  |  | 59.0 | %
Dividend yield |  |  | 0 | % |  |  | 0 | %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractural Term (in Years) |
Outstanding as of December 31, 2012 |  |  | 2,184,583 |  |  | $ | 2.20 |  |  |  |  |
Granted |  |  | 1,684,500 |  |  |  | 0.25 |  |  |  |  |
Exercised |  |  | - |  |  |  | - |  |  |  |  |
Cancelled/forfeited |  |  | (651,377 | ) |  |  | 0.52 |  |  |  |  |
Outstanding as of September 30, 2013 |  |  | 3,217,706 |  |  | $ | 1.52 |  |  |  | 7.3 |
Exercisable as of September 30, 2013 |  |  | 1,875,274 |  |  | $ | 2.35 |  |  |  | 6.0 |
Schedule of Product Warranty Liability [Table Text Block] |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Balance at the beginning of the period |  | $ | 150 |  |  | $ | 125 |  |  | $ | 159 |  |  | $ | 100 |
Accruals for warranties issued |  |  | 7 |  |  |  | 52 |  |  |  | 46 |  |  |  | 110 |
Settlements made during the period (in cash or in kind) |  |  | (17 | ) |  |  | (18 | ) |  |  | (65 | ) |  |  | (51 | )
Balance at the end of the period |  | $ | 140 |  |  | $ | 159 |  |  | $ | 140 |  |  | $ | 159 |

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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