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Accounts Receivable and Significant Concentrations (Details Textual) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Provision for Doubtful Accounts $ (5,766) $ 31,187
Commercial Customer [Member]    
Provision for Doubtful Accounts 31,200  
Allowance for Doubtful Accounts Receivable, Write-offs $ 274,500