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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2014
Accounting Policies [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended March 31, |
|  | 2014 |  |  | 2013 |
Basic and diluted loss per share: |  |  |  |  |  |  |  |
Net loss |  | $ | (4,070 | ) |  | $ | (1,428 | )
Basic and diluted loss per share: |  |  |  |  |  |  |  |
Weighted average shares outstanding |  |  | 51,725 |  |  |  | 44,699 |
Basic and diluted net loss per share |  | $ | (0.08 | ) |  | $ | (0.03 | )
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three months ended March 31, |
|  | 2014 |  |  | 2013 |
Cost of sales |  | $ | 2 |  |  | $ | - |
Research and development |  |  | (1 | ) |  |  | 7 |
Selling, general, and administrative |  |  | 122 |  |  |  | 38 |
Total stock-based compensation |  | $ | 123 |  |  | $ | 45 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Three months ended March 31, |
|  | 2014 |  |  | 2013 |
Fair value of options issued |  | $ | 0.32 |  |  | $ | 0.15 |
Exercise price |  | $ | 0.42 |  |  | $ | 0.23 |
Expected life of option (years) |  | 5.6 |  |  | 8.3 |
Risk-free interest rate |  |  | 1.78 | % |  |  | 1.57 | %
Expected volatility |  |  | 98.02 | % |  |  | 83.82 | %
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, 2013 |  |  | 2,861,893 |  |  | $ | 1.53 |  |  |  |  |
Granted |  |  | 1,950,000 |  |  |  | 0.42 |  |  |  |  |
Exercised |  |  | (5,000 | ) |  |  | 0.23 |  |  |  |  |
Cancelled/forfeited |  |  | (273,521 | ) |  |  | 2.00 |  |  |  |  |
Outstanding as of March 31, 2014 |  |  | 4,533,372 |  |  | $ | 1.03 |  |  |  | 8.2 |
Vested and expected to vest as of March 31, 2014 |  |  | 4,094,707 |  |  | $ | 0.91 |  |  |  | 8.2 |
Exercisable as of March 31, 2014 |  |  | 2,152,493 |  |  | $ | 1.68 |  |  |  | 6.6 |
Schedule of Product Warranty Liability [Table Text Block] |
|  | Three months ended March 31, |
|  | 2014 |  |  | 2013 |
Balance at the beginning of the period |  | $ | 75 |  |  | $ | 159 |
Accruals for warranties issued |  |  | 16 |  |  |  | 16 |
Settlements made during the period (in cash or in kind) |  |  | (16 | ) |  |  | (35 | )
Balance at the end of the period |  | $ | 75 |  |  | $ | 140 |

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