Revenue Recognition (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	$ 6,457,295	$ 3,622,269	$ 9,398,063	$ 7,965,560
Products Acquired From Eyston Company Ltd. [Member]
Revenues	5,821,498	3,281,392	8,276,333	7,221,233
G F C I s And Ventilation Fans [Member]
Revenues	$ 635,797	$ 340,877	$ 1,121,730	$ 744,327