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Note 17 - Taxation - Reconciliation of the Income Tax (Expense)/Benefit (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Pre-tax loss $ (9,760) $ (6,183)
U.S. federal rate 35.00% 35.00%
Income tax benefit computed at U.S. federal rate $ 3,416 $ 2,164
Rate differential for PRC earnings (724) (354)
Preferential tax treatments and tax holiday effects (238) (158)
Tax effect on toll charge income from the Act (492)
Tax effect on enactment of new tax rate (1,859)
Tax effect on change of net operating loss treatment (924)
Valuation allowance on deferred tax assets (434) (743)
Others 80 (87)
Effective income tax expense $ (251) $ (102)