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Note 4 - Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2014
Disclosure Text Block Supplement [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2014 |  |  | 2013 |
Cost of Design-to-silicon-yield solutions |  | $ | 724 |  |  | $ | 534 |
Research and development |  |  | 371 |  |  |  | 322 |
Selling, general and administrative |  |  | 565 |  |  |  | 453 |
Stock-based compensation expenses |  | $ | 1,660 |  |  | $ | 1,309 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Stock Plans Three Months Ended March 31, |  |  | Employee Stock Purchase Plan Three Months Ended March 31, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Expected life (in years) |  |  | 4.58 |  |  |  | 4.78 |  |  |  | 1.25 |  |  |  | 1.25 |
Volatility |  |  | 43.4 | % |  |  | 56.4 | % |  |  | 34.6 | % |  |  | 46.1 | %
Risk-free interest rate |  |  | 1.56 | % |  |  | 0.80 | % |  |  | 0.18 | % |  |  | 0.19 | %
Expected dividend |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Weighted average fair value per share of options granted during the period |  | $ | 7.75 |  |  | $ | 7.54 |  |  |  | — |  |  |  | — |
Weighted average fair value per share of employee stock purchase plan rights granted during the period |  |  | — |  |  |  | — |  |  | $ | 7.18 |  |  | $ | 5.28 |
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, 2014 |  |  | 2,880 |  |  | $ | 7.35 |  |  |  |  |  |  |  |  |
Granted (weighted average fair value of $7.75 per share) |  |  | 5 |  |  | $ | 20.39 |  |  |  |  |  |  |  |  |
Exercised |  |  | (117 | ) |  | $ | 6.68 |  |  |  |  |  |  |  |  |
Canceled |  |  | (11 | ) |  | $ | 8.74 |  |  |  |  |  |  |  |  |
Expired |  |  | (7 | ) |  | $ | 5.91 |  |  |  |  |  |  |  |  |
Outstanding, March 31, 2014 |  |  | 2,750 |  |  | $ | 7.40 |  |  |  | 6.35 |  |  | $ | 29,694 |
Vested and expected to vest, March 31, 2014 |  |  | 2,692 |  |  | $ | 7.36 |  |  |  | 6.31 |  |  | $ | 29,155 |
Exercisable, March 31, 2014 |  |  | 1,858 |  |  | $ | 6.87 |  |  |  | 5.61 |  |  | $ | 21,003 |
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, 2014 |  |  | 759 |  |  | $ | 14.44 |
Granted |  |  | 5 |  |  | $ | 20.39 |
Vested |  |  | (3 | ) |  | $ | 6.90 |
Forfeited |  |  | (3 | ) |  | $ | 16.50 |
Nonvested, March 31, 2014 |  |  | 758 |  |  | $ | 14.51 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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