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Taxes (Details 1)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]    
Federal statutory rate (34.00%) (34.00%)
Effect of:    
State income taxes (net of federal tax benefit) (0.50%) (2.70%)
Taxes on foreign income at rates that differ from U.S. statutory rate 28.00% 17.30%
Change in valuation allowance on deferred tax assets (90.10%) (34.50%)
2017 Tax Act 136.90% 0.00%
Deemed dividend under Section 956 of the Internal Revenue Code (35.40%) 75.90%
Increase (decrease) in unrecognized tax benefits 0.70% 1.60%
Other 0.00% 0.10%
Effective tax rate 5.60% 23.70%