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Accounts Receivable (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable    
Trade accounts receivable $ 1,709,842 $ 1,812,660
Other receivables 298,492 211,027
Less allowance for bad debts (17,546) (31,843)
Accounts Receivable, Net, Current $ 1,990,788 $ 1,991,844