Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 4,733,135	$ 3,975,736	$ 11,951,765	$ 8,012,891
Cost of sales	2,520,653	2,006,132	6,284,046	4,562,761
Gross margin	2,212,482	1,969,604	5,667,719	3,450,130
Operating expenses:
Selling, general and administrative	609,394	530,180	1,847,028	1,652,116
Litigation expenses	16,830	59,680	118,890	134,799
Engineering, research and development	580,517	622,082	1,631,359	1,642,785
Total operating expenses	1,206,741	1,211,942	3,597,277	3,429,700
Income from operations	1,005,741	757,662	2,070,442	20,430
Other income (expense):
Interest income	2,065	1,010	4,083	3,017
Change in fair value of common stock warrants		(23,000)	(73,000)	(23,000)
Interest expense - judgment	(84,715)	(72,003)	(255,821)	(215,226)
Interest expense	(15,514)	(24,216)	(44,117)	(83,251)
Total other expense	(98,164)	(118,209)	(368,855)	(318,460)
Income (loss) before income taxes	907,577	639,453	1,701,587	(298,030)
Income tax expense	0	0	0	0
Net income (loss)	907,577	639,453	1,701,587	(298,030)
Deemed dividend related to beneficial conversion feature of Series B Convertible Preferred Stock	0	(420,000)	0	(420,000)
Preferred stock dividends	(80,000)	(112,807)	(240,000)	(232,807)
Net income (loss) attributable to common shareholders	$ 827,577	$ 106,646	$ 1,461,587	$ (950,837)
Basic income (loss) per common share (in Dollars per share)	$ 0.25	$ 0.03	$ 0.45	$ (0.29)
Diluted income (loss) per common share (in Dollars per share)	$ 0.18	$ 0.03	$ 0.35	$ (0.29)
Weighted average shares outstanding:
Basic (in Shares)	3,255,887	3,255,887	3,255,887	3,255,887
Diluted (in Shares)	4,975,665	3,255,887	4,824,652	3,255,887