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v3.21.2

Concentrations of Credit Risk, Customers, and Suppliers (Details Narrative) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2018
Total net sales | $ 45,802,574 | $ 38,500,570 |
Republic of China [Member] |  |  |
Debt description |  |  | The U.S. government imposed tariffs of up to 25% on certain goods imported from China. All of our products are manufactured and imported from China however, only our microphones are currently subject to a 7.5% tariff currently in place.
North America [Member] |  |  |
Total net sales | $ 44,200,000 | $ 36,000,000 |
Accounts Receivable [Member] | North America [Member] | Customer Concentration Risk [Member] |  |  |
Concentration of sales risk, percentage | 10.00% | 10.00% |
Accounts Receivable [Member] | Four Customers [Member] | North America [Member] | Customer Concentration Risk [Member] |  |  |
Concentration of sales risk, percentage | 70.00% | 82.00% |
Sales Revenue [Member] | Macau Subsidiary [Member] |  |  |
Total net sales | $ 4,100,000 | $ 5,100,000 |
Sales Revenue [Member] | Three Customers [Member] | Customer Concentration Risk [Member] |  |  |
Concentration of sales risk, percentage | 69.00% | 64.00% |
Sales Revenue [Member] | Customers [Member] | Customer Concentration Risk [Member] |  |  |
Concentration of sales risk, percentage | 10.00% |  |
Sales Revenue [Member] | Customer One [Member] | Customer Concentration Risk [Member] |  |  |
Concentration of sales risk, percentage | 36.00% | 41.00% |
Sales Revenue [Member] | Customer Two [Member] | Customer Concentration Risk [Member] |  |  |
Concentration of sales risk, percentage | 20.00% | 13.00% |
Sales Revenue [Member] | Customer Three [Member] | Customer Concentration Risk [Member] |  |  |
Concentration of sales risk, percentage | 13.00% | 10.00% |
Sales Revenue [Member] | Customer Four [Member] | Customer Concentration Risk [Member] |  |  |
Concentration of sales risk, percentage | 12.00% |  |
Purchases [Member] | Customer Concentration Risk [Member] | Republic of China [Member] |  |  |
Concentration of sales risk, percentage | 100.00% | 100.00% |

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