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Note 2 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Restricted Cash and Cash Equivalents, Noncurrent | $ 488 | $ 468 |
Allocated Share-based Compensation Expense | $ 12,938 | 7,794 | $ 4,664
Minimum Tax Percentage Attained Likely to be Realized upon Ultimate Settlement | 50.00% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 8.33% |  |
Severance Costs | $ 3,775 | 3,085 | 2,651
Restricted Cash and Cash Equivalents, Current | 0 | 0 |
Asset Impairment Charges | 0 | 0 | 0
Short-term Investments | 65,493 | 57,103 |
Interest-bearing Deposits [Member] |  |  |
Short-term Investments | $ 0 |  |
U.S. Plan [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% |  |
Defined Contribution, Plan Employer Matching Contribution, Percent of Participants Contribution | 50.00% |  |
Foreign Pension Plan [Member] | VSUK Plan [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% |  |
Defined Contribution Plan, Contributions, Percentage of Participants Base Pay | 3.00% |  |
Foreign Exchange Forward Contract Derivatives [Member] |  |  |
Derivative, Loss on Derivative | $ 332 | 307 |
Employees and Consultants [Member] |  |  |
Allocated Share-based Compensation Expense | $ 12,938 | $ 7,794 | $ 4,664
Israel, New Shekels |  |  |
Investment Interest Rate | 15.00% |  |
Minimum [Member] |  |  |
Short-term Investment, Maturity Period | 90 days |  |
Minimum [Member] | U.S. Plan [Member] |  |  |
Defined Contribution Plan, Contributions, Percentage of Participants Base Pay | 3.00% |  |
Minimum [Member] | United States of America, Dollars |  |  |
Investment Interest Rate | 0.55% | 0.30% |
Maximum [Member] |  |  |
Short-term Investment, Maturity Period | 1 year |  |
Maximum [Member] | U.S. Plan [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Base Pay | 3.00% |  |
Defined Contribution Plan, Contributions, Percentage of Participants Base Pay | 5.00% |  |
Participant Matching Contribution Percentage of Base Remuneration | 80.00% |  |
Maximum [Member] | United States of America, Dollars |  |  |
Investment Interest Rate | 1.11% | 1.00% |

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