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Note 3 - Taxation (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
Origin of income before taxes |  | 2012 |  |  | 2011 |  |  | 2010 |
United States |  | $ | 5,655 |  |  | $ | 8,244 |  |  | $ | 4,144 |
Foreign |  |  | (577 | ) |  |  | 1,013 |  |  |  | (458 | )
Income before taxes |  | $ | 5,078 |  |  | $ | 9,257 |  |  | $ | 3,686 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Current: |  |  |  |  |  |  |  |  |
Federal |  | $ | 1,529 |  |  | $ | 1,456 |  |  | $ | 2,520 |
State |  |  | 425 |  |  |  | 402 |  |  |  | 414 |
Foreign |  |  | 471 |  |  |  | 482 |  |  |  | 103 |
Total current |  |  | 2,425 |  |  |  | 2,340 |  |  |  | 3,037 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 9 |  |  |  | 674 |  |  |  | (1,051 | )
State |  |  | 1 |  |  |  | 95 |  |  |  | (97 | )
Foreign |  |  | (133 | ) |  |  | - |  |  |  | 44 |
Total deferred |  |  | (123 | ) |  |  | 769 |  |  |  | (1,104 | )
Income tax expense |  | $ | 2,302 |  |  | $ | 3,109 |  |  | $ | 1,933 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Provision at the U.S. federal statutory rate |  |  | 34.0 | % |  |  | 34.0 | % |  |  | 35.0 | %
State taxes, net of federal benefit |  |  | 4.2 | % |  |  | 3.2 | % |  |  | 3.9 | %
Foreign tax rate differential |  |  | 0.0 | % |  |  | (1.2 | %) |  |  | 0.6 | %
Valuation allowance |  |  | 10.5 | % |  |  | 2.7 | % |  |  | 6.5 | %
Research credits |  |  | (10.0 | %) |  |  | (6.5 | %) |  |  | 0.0 | %
Stock-based compensation |  |  | 0.3 | % |  |  | 0.0 | % |  |  | 4.4 | %
Other |  |  | 6.3 | % |  |  | 1.4 | % |  |  | 2.0 | %
Income tax expense effective rate |  |  | 45.3 | % |  |  | 33.6 | % |  |  | 52.4 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | 2012 |  |  | 2011 |
Deferred tax assets: |  |  |  |  |  |
Stock compensation expense |  | $ | 7,936 |  |  | $ | 7,734 |
Alternative minimum tax credit |  |  | 71 |  |  |  | 71 |
Warranty reserve |  |  | 291 |  |  |  | 118 |
Accounts receivable |  |  | 65 |  |  |  | 161 |
Vacation accrual |  |  | 157 |  |  |  | 118 |
Commissions and other accruals |  |  | 205 |  |  |  | - |
Deferred rent liability |  |  | 53 |  |  |  | 47 |
Equipment |  |  | 69 |  |  |  | - |
Intangible assets |  |  | 778 |  |  |  | 603 |
Net operating loss carryforwards |  |  | 1,868 |  |  |  | 1,327 |
Total deferred tax assets |  |  | 11,493 |  |  |  | 10,179 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Equipment |  |  | (1,466 | ) |  |  | (1,513 | )
Prepaid expenses |  |  | (200 | ) |  |  | (285 | )
Patents |  |  | (489 | ) |  |  | (384 | )
Goodwill |  |  | (3,193 | ) |  |  | (2,689 | )
Other |  |  | (16 | ) |  |  | (20 | )
Total deferred tax liabilities |  |  | (5,364 | ) |  |  | (4,891 | )
Net deferred tax asset before valuation allowance |  |  | 6,129 |  |  |  | 5,288 |
Valuation allowances for deferred tax assets |  |  | (1,868 | ) |  |  | (1,327 | )
Net deferred tax asset |  | $ | 4,261 |  |  | $ | 3,961 |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
Current assets |  | $ | 573 |  |  | $ | 163 |
Long-term assets |  |  | 3,688 |  |  |  | 3,798 |
Net deferred tax asset |  | $ | 4,261 |  |  | $ | 3,961 |
Summary of Valuation Allowance [Table Text Block] |
Year |  | Balance at January 1 |  | Charged to costs and expenses |  | (Deductions)/Other |  | Balance at December 31
2010 |  | $ | 1,177 |  |  |  | - |  |  |  | (75 | ) |  | $ | 1,102 |
2011 |  | $ | 1,102 |  |  |  | - |  |  |  | 225 |  |  | $ | 1,327 |
2012 |  | $ | 1,327 |  |  |  | - |  |  |  | 541 |  |  | $ | 1,868 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
Description |  | 2012 |  |  | 2011 |  |  | 2010 |
Balance at beginning of period |  | $ | 505 |  |  | $ | 664 |  |  | $ | 724 |
Increases in positions taken in a prior period |  |  | - |  |  |  | - |  |  |  | - |
Decreases in positions taken in a prior period |  |  | - |  |  |  | - |  |  |  | - |
Increases in positions taken in a current period |  |  | 39 |  |  |  | 117 |  |  |  | 60 |
Decreases in positions taken in a current period |  |  | - |  |  |  | - |  |  |  | - |
Decreases due to settlements |  |  | (202 | ) |  |  | - |  |  |  | - |
Decreases due to lapse of statute of limitations |  |  | (303 | ) |  |  | (276 | ) |  |  | (120 | )
Balance at end of period |  | $ | 39 |  |  | $ | 505 |  |  | $ | 664 |

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