Annual report pursuant to Section 13 and 15(d)

Allowance for Doubtful Accounts (Details)

v3.19.1
Allowance for Doubtful Accounts (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance at the beginning of the year $ 83,789 $ 23,000
(Recoveries)/provision for bad debts (14,000) 63,000
Charge-offs (6,062) (2,211)
Balance at the end of the year $ 63,727 $ 83,789