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REVENUE (Tables) | 6 Months Ended
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Sep. 30, 2021
Schedule of net sales on a disaggregated basis by market and contract type | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net Sales by market |  | Defense |  | Industrial |  | Totals
Three months ended September 30, 2021 | ​ | $ | 4,403,156 | ​ | $ | 394,254 | ​ | $ | 4,797,410
Three months ended September 30, 2020 | ​ | $ | 3,225,503 | ​ | $ | 1,488,430 | ​ | $ | 4,713,933
Six months ended September 30, 2021 | ​ | $ | 7,506,287 | ​ | $ | 703,352 | ​ | $ | 8,209,639
Six months ended September 30, 2020 | ​ | $ | 6,429,093 | ​ | $ | 1,567,365 | ​ | $ | 7,996,458
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net Sales by contract type |  | Over-time |  | Point-in-time |  | Totals
Three months ended September 30, 2021 | ​ | $ | 3,757,988 | ​ | $ | 1,039,422 | ​ | $ | 4,797,410
Three months ended September 30, 2020 | ​ | $ | 3,081,971 | ​ | $ | 1,631,962 | ​ | $ | 4,713,933
Six months ended September 30, 2021 | ​ | $ | 6,880,637 | ​ | $ | 1,329,002 | ​ | $ | 8,209,639
Six months ended September 30, 2020 | ​ | $ | 6,109,868 | ​ | $ | 1,886,590 |  | $ | 7,996,458
Schedule of Contract Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Progress | ​ | ​
​ |  | Unbilled |  | payments |  | Total
September 30, 2021 | ​ | $ | 12,725,048 | ​ | $ | (3,418,186) | ​ | $ | 9,306,862
March 31, 2021 | ​ | $ | 11,392,948 | ​ | $ | (5,860,540) | ​ | $ | 5,532,408
Sales [Member] |
Schedule of revenues from customers who accounted for more than 10% of our net sales | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Three months ended | ​ | Six months ended | ​ | Six months ended |
​ | ​ | September 30, 2021 | ​ | September 30, 2020 | ​ | September 30, 2021 | ​ | September 30, 2020 |
Customer |  | Amount |  | Percent |  | Amount |  | Percent |  | Amount |  | Percent |  | Amount |  | Percent |
A | ​ | $ | 1,175,893 | ​ | 25 | % | $ | 499,921 | ​ | 11 | % | $ | 2,479,665 | ​ | 30 | % | $ | 1,070,701 | ​ | 13 | %
B | ​ | $ | 721,405 |  | 15 | % | $ | 686,486 |  | 15 | % | $ | 1,660,261 | ​ | 20 | % | $ | 1,340,673 |  | 17 | %
C | ​ | $ | 648,954 |  | 14 | % | $ | 459,441 |  | 10 | % | $ | 938,534 |  | 11 | % | $ | * |  | * | %
D | ​ | $ | * |  | * | % | $ | 726,921 |  | 15 | % | $ | * |  | * | % | $ | * |  | * | %
E | ​ | $ | * | ​ | * | % | $ | 694,332 | ​ | 15 | % | $ | * | ​ | * | % | $ | 1,708,987 | ​ | 21 | %
F | ​ | $ | * | ​ | * | % | $ | 575,315 | ​ | 12 | % | $ | * | ​ | * | % | $ | * | ​ | * | %
G | ​ | $ | * | ​ | * | % | $ | 558,160 | ​ | 12 | % | $ | * | ​ | * | % | $ | 948,672 | ​ | 12 | %
*Less than 10% of total

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