Bank Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of short term bank loans
Bank loans	$ 25,999	$ 29,497
Industrial and Commercial Bank Of China [Member]
Schedule of short term bank loans
Bank loans	11,648	14,540
Nanjing Bank [Member]
Schedule of short term bank loans
Bank loans	5,824	5,089
China Minsheng Bank [Member]
Schedule of short term bank loans
Bank loans	2,912	2,908
Bank of Communications [Member]
Schedule of short term bank loans
Bank loans	2,897	2,893
Shanghai Pudong Development Bank [Member]
Schedule of short term bank loans
Bank loans	2,617	2,613
China Everbright Bank [Member]
Schedule of short term bank loans
Bank loans		1,454
HSBC [Member]
Schedule of short term bank loans
Bank loans	$ 101