Revenue Recognition (Details) - USD ($)	3 Months Ended	6 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ 5,272,223	$ 6,457,295	$ 9,940,221	$ 9,398,063
Products Acquired From Eyston Company Ltd. [Member]
Revenues	4,409,054	5,821,498	8,676,345	8,276,333
Sales of GFCI's and ventilation fans [Member]
Revenues	$ 863,169	$ 635,797	$ 1,263,876	$ 1,121,730

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details