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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2014
Accounting Policies [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended |  |  | Six months ended |
|  | June 30, |  |  | June 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Basic and diluted loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (622 | ) |  | $ | (679 | ) |  | $ | (4,692 | ) |  | $ | (2,107 | )
Basic and diluted loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding |  |  | 7,836 |  |  |  | 4,623 |  |  |  | 6,512 |  |  |  | 4,547 |
Basic and diluted net loss per share |  | $ | (0.08 | ) |  | $ | (0.15 | ) |  | $ | (0.72 | ) |  | $ | (0.46 | )
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three months ended |  |  | Six months ended |
|  | June 30, |  |  | June 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Cost of sales |  | $ | 4 |  |  | $ | 1 |  |  | $ | 6 |  |  | $ | 1 |
Research and development |  |  | 3 |  |  |  | 8 |  |  |  | 2 |  |  |  | 15 |
Selling, general, and administrative |  |  | 128 |  |  |  | 42 |  |  |  | 250 |  |  |  | 80 |
Total stock-based compensation |  | $ | 135 |  |  | $ | 51 |  |  | $ | 258 |  |  | $ | 96 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Six months ended |
|  | June 30, |
|  | 2014 |  |  | 2013 |
Fair value of options issued |  | $ | 3.34 |  |  | $ | 1.58 |
Exercise price |  | $ | 4.34 |  |  | $ | 2.32 |
Expected life of option |  |  | 5.6 |  |  |  | 7.4 |
Risk-free interest rate |  |  | 1.79 | % |  |  | 1.30 | %
Expected volatility |  |  | 98.1 | % |  |  | 89.2 | %
Dividend yield |  |  | 0 | % |  |  | 0 | %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in Years) |
Outstanding as of December 31, 2013 |  |  | 286,188 |  |  | $ | 15.30 |  |  |  |  |
Granted |  |  | 208,000 |  |  |  | 4.34 |  |  |  |  |
Exercised |  |  | (500 | ) |  |  | 2.30 |  |  |  |  |
Cancelled/forfeited |  |  | (83,561 | ) |  |  | 15.61 |  |  |  |  |
Outstanding as of June 30, 2014 |  |  | 410,127 |  |  | $ | 9.70 |  |  |  | 7.6 |
Vested and expected to vest as of June 30, 2014 |  |  | 372,885 |  |  | $ | 8.59 |  |  |  | 8.4 |
Exercisable as of June 30, 2014 |  |  | 207,818 |  |  | $ | 14.83 |  |  |  | 7.2 |
Schedule of Product Warranty Liability [Table Text Block] |
|  | Three months ended |  |  | Six months ended |
|  | June 30, |  |  | June 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Balance at the beginning of the period |  | $ | 75 |  |  | $ | 140 |  |  | $ | 75 |  |  | $ | 159 |
Accruals for warranties issued |  |  | - |  |  |  | 23 |  |  |  | 16 |  |  |  | 39 |
Settlements made during the period (in cash or in kind) |  |  | (7 | ) |  |  | (13 | ) |  |  | (23 | ) |  |  | (48 | )
Balance at the end of the period |  | $ | 68 |  |  | $ | 150 |  |  | $ | 68 |  |  | $ | 150 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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