Major Customers and Vendors  | 
9 Months Ended | 
|---|---|
Sep. 30, 2021  | |
| Major Customers and Vendors | |
| Major Customers and Vendors | 
 13. Major Customers and Vendors: 
 The Company had two major vendors that accounted for 20% and 9%, respectively, of total purchases during the three months ended September 30, 2021 and 21% and 12%, respectively, of total purchases during the three months ended September 30, 2020. The Company had two major vendors that accounted for 20% and 9%, respectively, of total purchases during the nine months ended September 30, 2021 and 20% and 9%, respectively, of total purchases during the nine months ended September 30, 2020. 
 The Company had two major customers that accounted for 21% and 18%, respectively, of its net sales during the three months ended September 30, 2021 and 22% and 12%, respectively, of its net sales during the three months ended September 30, 2020. The Company had two major customers that accounted for 22% and 17%, respectively, of its net sales during the nine months ended September 30, 2021 and 26% and 14%, respectively, of its net sales during the nine months ended September 30, 2020. These same customers accounted for 16% and 15%, respectively, of total net accounts receivable as of September 30, 2021 and 19% and 9%, respectively, of total net accounts receivable as of December 31, 2020. 
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