XML 30 R20.htm IDEA: XBRL DOCUMENT v3.10.0.1
Accounts Receivable (Details 1) - Trade Accounts Receivable [Member] - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Accounts receivable allowance, beginning of year $ 181,473 $ 200,266
Provision adjustment 84,592 (18,793)
Write-off (141,038) 0
Accounts receivable allowance, end of period $ 125,027 $ 181,473