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Note 4 - Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2013
Disclosure Text Block Supplement [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Cost of design-to-silicon yield-solutions |  | $ | 649 |  |  | $ | 432 |  |  | $ | 1,183 |  |  | $ | 751 |
Research and development |  |  | 337 |  |  |  | 251 |  |  |  | 659 |  |  |  | 438 |
Selling, general and administrative |  |  | 723 |  |  |  | 636 |  |  |  | 1,176 |  |  |  | 1,035 |
Stock-based compensation expenses |  | $ | 1,709 |  |  | $ | 1,319 |  |  | $ | 3,018 |  |  | $ | 2,224 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Expected life (in years) |  |  | 4.78 |  |  |  | 4.87 |  |  |  | 4.78 |  |  |  | 4.84 |
Volatility |  |  | 55.0 | % |  |  | 59.5 | % |  |  | 56.1 | % |  |  | 59.6 | %
Risk-free interest rate |  |  | 1.33 | % |  |  | 0.78 | % |  |  | 0.93 | % |  |  | 0.78 | %
Expected dividend |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Weighted average fair value per share of options granted during the period |  | $ | 8.50 |  |  | $ | 4.32 |  |  | $ | 7.77 |  |  | $ | 4.21 |
|  |  |  |  |  |  |  |  |  | Six Months Ended June 30, |
|  |  |  |  |  |  |  |  |  | 2013 |  |  | 2012 |
Expected life (in years) |  |  |  |  |  |  |  |  |  |  | 1.25 |  |  |  | 1.25 |
Volatility |  |  |  |  |  |  |  |  |  |  | 46.1 | % |  |  | 51.1 | %
Risk-free interest rate |  |  |  |  |  |  |  |  |  |  | 0.19 | % |  |  | 0.16 | %
Expected dividend |  |  |  |  |  |  |  |  |  |  | — |  |  |  | — |
Weighted average fair value of purchase rights granted under the purchase plan |  |  |  |  |  |  |  |  |  | $ | 5.28 |  |  | $ | 2.33 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Options (in thousands) |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding, January 1, 2013 |  |  | 3,810 |  |  | $ | 6.91 |  |  |  |  |  |  |  |  |
Granted |  |  | 63 |  |  | $ | 15.83 |  |  |  |  |  |  |  |  |
Exercised |  |  | (427 | ) |  | $ | 6.51 |  |  |  |  |  |  |  |  |
Canceled |  |  | (72 | ) |  | $ | 6.93 |  |  |  |  |  |  |  |  |
Expired |  |  | (16 | ) |  | $ | 5.44 |  |  |  |  |  |  |  |  |
Outstanding, June 30, 2013 |  |  | 3,358 |  |  | $ | 7.12 |  |  |  | 7.05 |  |  | $ | 37,964 |
Vested and expected to vest, June 30, 2013 |  |  | 3,181 |  |  | $ | 7.05 |  |  |  | 6.96 |  |  | $ | 36,191 |
Exercisable, June 30, 2013 |  |  | 1,890 |  |  | $ | 6.57 |  |  |  | 6.01 |  |  | $ | 22,416 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Shares (in thousands) |  |  | Weighted Average Grant Date Fair Value Per Share |
Nonvested, January 1, 2013 |  |  | 450 |  |  | $ | 7.97 |
Granted |  |  | 547 |  |  | $ | 18.48 |
Vested |  |  | (87 | ) |  | $ | 9.01 |
Forfeited |  |  | (20 | ) |  | $ | 8.01 |
Nonvested, June 30, 2013 |  |  | 890 |  |  | $ | 14.22 |

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