Income Tax (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax (Textual)
Income tax, description			One significant change was to decrease the general corporate income tax rate from 34% to 21%. This reduction had no effect on the Company's income tax expense as the reduction in deferred tax assets was offset by an equivalent reduction in the valuation allowance. Another significant change resulting from U.S. Tax Reform is that any future remittances to the parent company from business income earned by its subsidiaries outside of the U.S. will no longer to taxable to the Company under U.S. tax law. The Company would be liable for payment of income tax, or reduction of the net operating loss carryover, at a reduced rate for any accumulated earnings and profits of its non-U.S. subsidiaries at December 31, 2017.
PRC [Member]
Income Tax (Textual)
PRC statutory rate	25.00%	25.00%	25.00%	25.00%
Income tax rate for dividends distribution			10.00%
Hong Kong China [Member]
Income Tax (Textual)
PRC statutory rate			16.50%
Income tax, description			Its income tax rate is 8.25% when its profit is under HKD 2.0 million and its income tax rate is 16.5% when its profit is over HKD 2.0 million.
Maximum [Member]
Income Tax (Textual)
Effective income tax reduction, percent			15.00%
Minimum [Member]
Income Tax (Textual)
Effective income tax reduction, percent			9.00%
Xizang (Tibet) [Member]
Income Tax (Textual)
PRC statutory rate			15.00%
Non-U.S. subsidiaries [Member]
Income Tax (Textual)
U.S. deferred income taxes			$ 99,900