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Note 1 - Organization and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Property, Plant and Equipment, Annual Depreciation Rates [Table Text Block] |
|  | %
Computers, software and equipment |  | 10 | - | 33
Office furniture and equipment |  | 7 | - | 33
Leasehold improvements |  | 10 | - | 25
|  | (the shorter of the expected lease term or useful economic life)
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  | 2017 |  | 2018 |  | 2019
Expected dividend yield |  |  | 0% |  |  |  | 0% |  |  |  | 0% |
Expected volatility |  | 28% | - | 46% |  | 35% | - | 42% |  | 42% | - | 43%
Risk-free interest rate |  | 0.5% | - | 1.1% |  | 0.7% | - | 2.2% |  | 2.0% | - | 2.5%
Expected forfeiture |  |  | 0% |  |  |  | 0% |  |  |  | 0% |
Contractual term of up to (months) |  |  | 24 |  |  |  | 24 |  |  |  | 24 |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year ended December 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
Cost of revenue |  | $ | 459 |  |  | $ | 588 |  |  | $ | 630 |
Research and development, net |  |  | 3,839 |  |  |  | 5,141 |  |  |  | 5,857 |
Sales and marketing |  |  | 1,428 |  |  |  | 1,587 |  |  |  | 1,495 |
General and administrative |  |  | 2,967 |  |  |  | 3,051 |  |  |  | 2,736 |
Total equity-based compensation expense |  | $ | 8,693 |  |  | $ | 10,367 |  |  | $ | 10,718 |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Balance at beginning of period |  |  | Additions |  |  | Deduction |  |  | Balance at end of period |
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | — |  |  | $ | 327 |  |  | $ | — |  |  | $ | 327 |
Year ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Year ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year ended December 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
Numerator : |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 17,028 |  |  | $ | 574 |  |  | $ | 28 |
Denominator (in thousands) : |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average common stock outstanding |  |  | 21,771 |  |  |  | 22,034 |  |  |  | 21,932 |
Effect of stock-based awards |  |  | 790 |  |  |  | 469 |  |  |  | 391 |
Diluted weighted-average common stock outstanding |  |  | 22,561 |  |  |  | 22,503 |  |  |  | 22,323 |
Basic net earnings per share |  | $ | 0.78 |  |  | $ | 0.03 |  |  | $ | 0.00 |
Diluted net earnings per share |  | $ | 0.75 |  |  | $ | 0.03 |  |  | $ | 0.00 |
Immervision [Member] |
Notes Tables |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] |
Prepaid expenses |  | $ | 2,937 |
Intangible assets: |  |  |  |
Core technologies |  |  | 7,063 |
Total assets |  | $ | 10,000 |
Acquisition of Hillcrest Labs [Member] |
Notes Tables |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] |
Tangible assets (including inventory, property and equipment and other) |  | $ | 681 |
Intangible assets: |  |  |  |
Developed technologies |  |  | 2,475 |
Customer relationships |  |  | 3,518 |
Customer backlog |  |  | 72 |
Goodwill |  |  | 4,458 |
Total assets |  | $ | 11,204 |

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