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Note 9 - Income Taxes - Schedule of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 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 |  |

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