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Accounts Receivable (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Accounts Receivable [Abstract]    
Allowances for doubtful accounts $ 839,895 $ 839,895
Provision for doubtful accounts 0 810,580
Accounts receivable write offs $ 0 $ 4,920