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Income Tax (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013
Income Taxes [Line Items]
Effective income tax rate	(12.50%)	15.00%
Net operating losses	$ 14,150
Deferred tax asset valuation allowance	100.00%
Operating income loss carryforwards, period	20 years
Foreign pretax earnings	$ 1,210	$ 22,380
Federal income additional taxes	23,850
Undistributed earnings	$ 113,160
Yinghua and Shanghai TCH [Member]
Income Taxes [Line Items]
Effective income tax rate	25.00%	25.00%
Xi'an TCH [Member]
Income Taxes [Line Items]
Effective income tax rate	25.00%		15.00%
Erdos TCH Zhonghong Huahong [Member]
Income Taxes [Line Items]
Effective income tax rate	25.00%	25.00%

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