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Note 9 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  | Year ended December 31,
|  | 2016 |  | 2015 |  | 2014
Domestic |  | $ | (16,898 | ) |  | $ | (20,098 | ) |  | $ | (15,606 | )
Foreign |  |  | 319 |  |  |  | (499 | ) |  |  | (3,416 | )
|  | $ | (16,579 | ) |  | $ | (20,597 | ) |  | $ | (19,022 | )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year ended December 31,
|  | 2016 |  | 2015 |  | 2014
Domestic: |  |  |  |  |  |
Federal |  | $ | 92 |  |  | $ | — |  |  | $ | — |
State |  |  | 109 |  |  |  | 85 |  |  |  | 16 |
Foreign |  |  | 930 |  |  |  | 601 |  |  |  | 360 |
|  | $ | 1,131 |  |  | $ | 686 |  |  | $ | 376 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31,
|  | 2016 |  | 2015
Carry forward losses and credits |  | $ | 6,294 |  |  | $ | 9,220 |
Deferred revenues |  |  | 16,774 |  |  |  | 12,223 |
Accrued payroll, commissions, vacation |  |  | 2,078 |  |  |  | 1,247 |
Allowance for doubtful accounts |  |  | 43 |  |  |  | 88 |
Accrued severance pay |  |  | 372 |  |  |  | 328 |
Other |  |  | 2,939 |  |  |  | 2,393 |
Net deferred tax assets before valuation allowance |  |  | 28,500 |  |  |  | 25,499 |
Valuation allowance |  |  | (28,500 | ) |  |  | (25,499 | )
Net deferred tax assets |  | $ | — |  |  | $ | — |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year ended December 31,
|  | 2016 |  | 2015 |  | 2014
Loss before taxes, as reported in the consolidated statements of operations |  | $ | (16,579 | ) |  | $ | (20,597 | ) |  | $ | (19,022 | )
Statutory tax rate |  |  | 34 | % |  |  | 34 | % |  |  | 34 | %
Theoretical tax benefits on the above amount at the US statutory tax rate |  | $ | (5,637 | ) |  | $ | (7,003 | ) |  | $ | (6,468 | )
Income tax at rate other than the U.S. statutory tax rate |  |  | 68 |  |  |  | 333 |  |  |  | 993 |
Tax advances and non-deductible expenses including equity based compensation expenses |  |  | 4,298 |  |  |  | 1,061 |  |  |  | 1,296 |
Operating losses and other temporary differences for which valuation allowance was provided |  |  | 3,001 |  |  |  | 6,558 |  |  |  | 4,596 |
Research and Development Tax Credit |  |  | (1,182 | ) |  |  | - |  |  |  | - |
State tax |  |  | (536 | ) |  |  | (477 | ) |  |  | (409 | )
Impact of rate change |  |  | (360 | ) |  |  | (82 | ) |  |  | 49 |
Change in tax reserve for uncertain tax positions |  |  | 1,209 |  |  |  | 320 |  |  |  | 308 |
Other individually immaterial income tax items |  |  | 270 |  |  |  | (24 | ) |  |  | 11 |
Actual tax expense |  | $ | 1,131 |  |  | $ | 686 |  |  | $ | 376 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
Gross unrecognized tax benefits as of January 1, 2015 |  | $ | 577 |
Increase/decrease in tax position for prior years |  |  | 460 |
Decrease for lapse of statute of limitations |  |  | (140 | )
Gross unrecognized tax benefits as of December 31, 2015 |  |  | 897 |
Increase/decrease in tax position for current year |  |  | 992 |
Increase/decrease in tax position for prior years |  |  | 217 |
Gross unrecognized tax benefits as of December 31, 2016 |  | $ | 2,106 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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