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Note 6 - Income Taxes - Reconciliation of Income Tax Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net loss before income taxes $ 12,545 $ 8,052 $ 3,013
Expected income tax benefit 4,391 2,818 1,055
Tax rate differential 581 297 95
Non-deductible expenses (152) (351) (240)
Others (63) 28 (5)
Change in valuation allowance (4,757) (2,792) (905)
Total income tax benefit