Bank Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of short term bank loans
Bank loans	$ 29,931	$ 29,497
Industrial and Commercial Bank of China [Member]
Schedule of short term bank loans
Bank loans	18,629	14,540
Nanjing Bank [Member]
Schedule of short term bank loans
Bank loans	6,449	5,089
China Minsheng Bank [Member]
Schedule of short term bank loans
Bank loans	2,866	2,908
Bank of Communications [Member]
Schedule of short term bank loans
Bank loans	1,426	2,893
HSBC [Member]
Schedule of short term bank loans
Bank loans	561
Shanghai Pudong Development Bank [Member]
Schedule of short term bank loans
Bank loans		2,613
China Everbright Bank Shanghai Pudong Development Bank [Member]
Schedule of short term bank loans
Bank loans		$ 1,454