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Note 7 - Taxes on Income (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 34.00% | 34.00%
Income Tax Expense (Benefit), Total | $ 5,000 | $ 4,420 | $ 9,760 | $ 5,260
Tax Adjustments, Settlements, and Unusual Provisions | 4,000 |  | 4,000 |
Net Discrete Tax Adjustment, Tax Act |  |  | 3,300 |
Net Discrete Tax Adjustment, Other Miscellaneous Discrete Items |  |  | 700 |
Accumulated Foreign Earnings and Profits Tax Rate, Liquid Assets |  | 15.50% |  |
Accumulated Foreign Earnings and Profits Tax Rate, Unremitted Foreign E&P |  | 8.00% |  |
Additional Deferred Tax Expense |  | $ 900 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total |  | 100 | 100 | 100
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | 100 | 100 | $ 100
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 100 | 100 | 100 |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit |  | $ 100 |  |
Domestic Tax Authority [Member] | Earliest Tax Year [Member] |  |  |  |
Open Tax Year |  | 2015 |  |
State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |  |  |
Open Tax Year |  | 2011 |  |
Other Noncurrent Liabilities [Member] |  |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 500 | $ 600 | $ 500 |

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