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Note 13 - Taxes on Income (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year ended December 31, |
|  | 2016 |  |  | 2017 |  |  | 2018 |
Domestic taxes: |  |  |  |  |  |  |  |  |  |  |  |
Current |  | $ | 6 |  |  | $ | (227 | ) |  | $ | 3 |
Deferred |  |  | — |  |  |  | — |  |  |  | — |
Foreign taxes: |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 3,932 |  |  |  | 3,473 |  |  |  | 2,913 |
Deferred |  |  | (613 | ) |  |  | (1,375 | ) |  |  | (2,187 | )
|  | $ | 3,325 |  |  | $ | 1,871 |  |  | $ | 729 |
Income before taxes on income: |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | (3,488 | ) |  | $ | (5,946 | ) |  | $ | (5,680 | )
Foreign |  |  | 19,913 |  |  |  | 24,845 |  |  |  | 6,983 |
|  | $ | 16,425 |  |  | $ | 18,899 |  |  | $ | 1,303 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year ended December 31, |
|  | 2016 |  |  | 2017 |  |  | 2018 |
Income before taxes on income |  | $ | 16,425 |  |  | $ | 18,899 |  |  | $ | 1,303 |
Theoretical tax at U.S. statutory rate |  |  | 5,585 |  |  |  | 6,426 |  |  |  | 274 |
Foreign income taxes at rates other than U.S. rate |  |  | (1,831 | ) |  |  | (2,304 | ) |  |  | 369 |
Approved and benefited enterprises benefits (*) |  |  | (2,767 | ) |  |  | (2,698 | ) |  |  | (239 | )
Subpart F |  |  | 538 |  |  |  | 737 |  |  |  | 563 |
Non-deductible items |  |  | 682 |  |  |  | 294 |  |  |  | 217 |
Non-taxable items |  |  | (505 | ) |  |  | (529 | ) |  |  | (434 | )
Changes in uncertain tax position |  |  | 505 |  |  |  | (1,757 | ) |  |  | 16 |
Stock-based compensation expense |  |  | — |  |  |  | (1,503 | ) |  |  | (62 | )
Deemed mandatory repatriation |  |  | — |  |  |  | 1,916 |  |  |  | 3,542 |
Impacts of GILTI |  |  | — |  |  |  | — |  |  |  | 880 |
Changes in valuation allowance |  |  | 1,212 |  |  |  | 2,076 |  |  |  | (5,005 | )
Other, net |  |  | (94 | ) |  |  | (787 | ) |  |  | 608 |
Taxes on income |  | $ | 3,325 |  |  | $ | 1,871 |  |  | $ | 729 |
(*)Basic and diluted earnings per share amounts of the benefit resulting from the “Approved Enterprise” and “Benefited Enterprise” status |  | $ | 0.13 |  |  | $ | 0.12 |  |  | $ | 0.01 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | As at December 31, |
|  | 2017 |  |  | 2018 |
Deferred tax assets |  |  |  |  |  |  |  |
Operating loss carryforward |  | $ | 13,069 |  |  | $ | 9,505 |
Accrued expenses and deferred revenues |  |  | 1,057 |  |  |  | 1,274 |
Temporary differences related to R&D expenses |  |  | 2,118 |  |  |  | 3,194 |
Equity-based compensation |  |  | 1,956 |  |  |  | 2,724 |
Tax credit carry forward |  |  | 1,866 |  |  |  | 1,381 |
Other |  |  | 476 |  |  |  | 705 |
Total gross deferred tax assets |  |  | 20,542 |  |  |  | 18,783 |
Valuation allowance |  |  | (16,590 | ) |  |  | (12,745 | )
Net deferred tax assets |  | $ | 3,952 |  |  | $ | 6,038 |
Deferred tax liabilities |  |  |  |  |  |  |  |
Intangible assets |  | $ | 275 |  |  | $ | 114 |
Other |  |  | 34 |  |  |  | — |
Total deferred tax liabilities |  | $ | 309 |  |  | $ | 114 |
Net deferred tax assets (*) |  | $ | 3,643 |  |  | $ | 5,924 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | Year ended December 31, |
|  | 201 7 |  |  | 201 8 |
Beginning of year |  | $ | 3,784 |  |  | $ | 2,224 |
Additions for current year tax positions |  |  | 1,188 |  |  |  | 575 |
Additions for prior year’s tax positions |  |  | 255 |  |  |  | — |
Reductions for prior year’s tax positions |  |  | — |  |  |  | (60 | )
Decrease as a result of the completion of a tax audit for prior years |  |  | (3,003 | ) |  |  | — |
Balance at December 31 |  | $ | 2,224 |  |  | $ | 2,739 |

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