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