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Concentrations of credit risk
12 Months Ended
Oct. 31, 2018
Risks and Uncertainties [Abstract]  
Concentrations of credit risk
Note 3 - Concentrations of credit risk
 
Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents with high-credit quality financial institutions. At October 31, 2018, the Company had cash and cash equivalent balances in excess of federally insured limits in the amount of approximately $15.4 million.
 
One customer, who is a distributor, accounted for approximately 62% of the Company’s net sales for the fiscal year ended October 31, 2018. This same customer accounted for approximately 27% of the Company’s net sales for the year ended October 31, 2017. This customer’s accounts receivable balance accounted for approximately 48% and 36% of the total net accounts receivable balance at October 31, 2018 and 2017, respectively. Although this customer has been an on-going major customer of the Company continuously in the past, the written agreement with this customer does not have any minimum purchase obligations and they could stop buying the Company’s products at any time and for any reason. A reduction, delay or cancellation of orders from this customer or the loss of this customer could significantly reduce the Company’s future revenues and profits.