Bank Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of short term bank loans
Bank loans	$ 28,839	$ 29,497
Industrial and Commercial Bank of China [Member]
Schedule of short term bank loans
Bank loans	14,900	14,540
Nanjing Bank [Member]
Schedule of short term bank loans
Bank loans	3,725	5,089
China Minsheng Bank [Member]
Schedule of short term bank loans
Bank loans	2,980	2,908
Bank of Communications [Member]
Schedule of short term bank loans
Bank loans	2,965	2,893
Shanghai Pudong Development Bank [Member]
Schedule of short term bank loans
Bank loans	2,678	2,613
China Everbright Bank [Member]
Schedule of short term bank loans
Bank loans	1,490	1,454
HSBC [Member]
Schedule of short term bank loans
Bank loans	$ 101