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Note 1 - Organization and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
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, Stock Options and Stock Appreciation Rights, Valuation Assumptions [Table Text Block] |
|  | 2016 (* |
Expected dividend yield |  |  | 0% |  |
Expected volatility |  | 38% | - | 49% |
Risk-free interest rate |  | 0.5% | - | 2.4% |
Expected forfeiture (employees) |  |  | — |  |
Expected forfeiture (executives) |  |  | 5% |  |
Contractual term of up to (years) |  |  | 10 |  |
Suboptimal exercise multiple (employees) |  |  | — |  |
Suboptimal exercise multiple (executives) |  |  | 2.4 |  |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  | 2016 |  |  | 2017 |  |  | 2018 |
Expected dividend yield |  |  | 0% |  |  |  |  | 0% |  |  |  |  | 0% |  |
Expected volatility |  | 29% | - | 57% |  |  | 28% | - | 46% |  |  | 35% | - | 42% |
Risk-free interest rate |  | 0.3% | - | 0.5% |  |  | 0.5% | - | 1.1% |  |  | 0.7% | - | 2.2% |
Expected forfeiture |  |  | 0% |  |  |  |  | 0% |  |  |  |  | 0% |  |
Contractual term of up to (months) |  |  | 24 |  |  |  |  | 24 |  |  |  |  | 24 |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year ended December 31, |
|  | 201 6 |  |  | 201 7 |  |  | 201 8 |
Cost of revenue |  | $ | 246 |  |  | $ | 459 |  |  | $ | 588 |
Research and development, net |  |  | 2,860 |  |  |  | 3,839 |  |  |  | 5,141 |
Sales and marketing |  |  | 922 |  |  |  | 1,428 |  |  |  | 1,587 |
General and administrative |  |  | 2,208 |  |  |  | 2,967 |  |  |  | 3,051 |
Total equity-based compensation expense |  | $ | 6,236 |  |  | $ | 8,693 |  |  | $ | 10,367 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year ended December 31, |
|  | 2016 |  |  | 2017 |  |  | 2018 |
Numerator : |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 13,100 |  |  | $ | 17,028 |  |  | $ | 574 |
Denominator (in thousands) : |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average common stock outstanding |  |  | 20,850 |  |  |  | 21,771 |  |  |  | 22,034 |
Effect of stock-based awards |  |  | 715 |  |  |  | 790 |  |  |  | 469 |
Diluted weighted-average common stock outstanding |  |  | 21,565 |  |  |  | 22,561 |  |  |  | 22,503 |
Basic net income per share |  | $ | 0.63 |  |  | $ | 0.78 |  |  | $ | 0.03 |
Diluted net income per share |  | $ | 0.61 |  |  | $ | 0.75 |  |  | $ | 0.03 |

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