Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 3,336,396	$ 3,912,168	$ 6,275,833	$ 7,218,630
Cost of sales	1,969,573	2,038,535	3,404,399	3,763,393
Gross margin	1,366,823	1,873,633	2,871,434	3,455,237
Selling, general and administrative	464,809	625,163	1,126,060	1,237,634
Litigation expenses	5,514	91,553	8,210	102,060
Engineering, research and development	554,555	525,739	1,186,508	1,050,842
Total operating expenses	1,024,878	1,242,455	2,320,778	2,390,536
Income from operations	341,945	631,178	550,656	1,064,701
Interest income	1,879	1,018	4,725	2,018
Other income	0	0	13,854	0
Change in fair value of common stock warrants	0	5,500	0	(73,000)
Interest expense – judgement	(52,490)	(90,596)	(127,634)	(171,106)
Interest expense	(9,380)	(10,866)	(19,160)	(28,603)
Total other expense, net	(59,991)	(94,944)	(128,215)	(270,691)
Income before income taxes	281,954	536,234	422,441	794,010
Income tax expense	59,206	0	88,713	0
Net income	222,748	536,234	333,728	794,010
Preferred dividends	80,000	80,000	160,000	160,000
Net income attributable to common shareholders	$ 142,748	$ 456,234	$ 173,728	$ 634,010
Basic income per common share (in Dollars per share)	$ 0.04	$ 0.14	$ 0.05	$ 0.19
Diluted income per common share (in Dollars per share)	$ 0.04	$ 0.11	$ 0.05	$ 0.16
Weighted average shares outstanding:
Basic (in Shares)	3,255,887	3,255,887	3,255,887	3,255,887
Diluted (in Shares)	5,068,949	4,945,665	3,255,887	4,945,665