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Finance Lease Liabilities (Details Textual) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Finance Lease Liabilities (Textual)        
Interest expense $ 74,079 $ 82,511 $ 167,152 $ 187,170