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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 | (130.90%) | 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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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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