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CONCENTRATION OF CREDIT RISK (Tables) | 6 Months Ended
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Sep. 30, 2021
Accounts Receivable |
Concentration of credit risk and major customers |
Schedule of revenues from customers who accounted for more than 10% of our net sales | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021 | ​ | March 31, 2021 |
Customer |  | Amount |  | Percent |  | Amount |  | Percent |
A | ​ | $ | 1,079,264 | ​ | 41 | % | $ | * | ​ | * | %
B | ​ | $ | * |  | * | % | $ | 399,692 |  | 66 | %
C | ​ | $ | 576,640 |  | 22 | % | $ | 193,368 |  | 32 | %
D | ​ | $ | 290,503 | ​ | 11 | % | $ | * | ​ | * | %
* less than 10% of total

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