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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 201 5 |
Balance at beginning of the year |  | $ | 187 |  |  | $ | 54 |  |  | $ | 58 |
Allowance increase (decrease) |  |  | 287 |  |  |  | 148 |  |  |  | 36 |
Write offs , net of recoveries |  |  | (2 | ) |  |  | (15 | ) |  |  | (40 | )
Balance at end of the year |  | $ | 472 |  |  | $ | 187 |  |  | $ | 54 |
Schedule of Deferred Revenue and Associated Cost of Goods Sold and Gross Profit [Table Text Block] |
|  | As of December 31, |
|  | 2017 |  |  | 2016 |
Deferred revenue |  | $ | 4,635 |  |  | $ | 3,882 |
Deferred cost of goods sold |  |  | 1,555 |  |  |  | 1,530 |
Deferred gross profit |  | $ | 3,080 |  |  | $ | 2,352 |
Schedule of Product Warranty Liability [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 201 5 |
Balance at the beginning of year |  | $ | 246 |  |  | $ | 288 |  |  | $ | 331 |
Accruals/additions |  |  | 399 |  |  |  | 361 |  |  |  | 442 |
Usage/claims |  |  | (400 | ) |  |  | (403 | ) |  |  | (485 | )
Balance at end of year |  | $ | 245 |  |  | $ | 246 |  |  | $ | 288 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 201 5 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  | $ | (14,172 | ) |  | $ | 2,444 |  |  | $ | 6,776 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares |  |  | 8,576,588 |  |  |  | 9,021,980 |  |  |  | 9,127,385 |
Dilutive common stock equivalents using treasury stock method |  |  | - |  |  |  | 284,054 |  |  |  | 467,274 |
Diluted weighted average shares |  |  | 8,576,588 |  |  |  | 9,306,034 |  |  |  | 9,594,659 |
Basic earnings per common share: |  | $ | (1.65 | ) |  | $ | 0.27 |  |  | $ | 0.74 |
Diluted earnings per common share: |  | $ | (1.65 | ) |  | $ | 0.26 |  |  | $ | 0.71 |
Weighted average options outstanding |  |  | 815,870 |  |  |  | 885,163 |  |  |  | 1,053,785 |
Anti-dilutive options not included in the computation |  |  | 815,870 |  |  |  | 323,644 |  |  |  | 177,125 |

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