Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 2,672,742	$ 4,733,135	$ 8,948,575	$ 11,951,765
Cost of sales	1,661,653	2,520,653	5,066,052	6,284,046
Gross margin	1,011,089	2,212,482	3,882,523	5,667,719
Selling, general and administrative	740,696	609,394	1,866,756	1,847,028
Litigation expenses	1,998	16,830	10,208	118,890
Engineering, research and development	492,432	580,517	1,678,940	1,631,359
Total operating expenses	1,235,126	1,206,741	3,555,904	3,597,277
Income (loss) from operations	(224,037)	1,005,741	326,619	2,070,442
Interest income	1,591	2,065	6,316	4,083
Other income	758	0	14,612	0
Gain on forgiveness of PPP loan	722,577	0	722,577	0
Change in fair value of common stock warrants	0	0	0	(73,000)
Interest expense - judgment	(52,490)	(84,715)	(180,124)	(255,821)
Interest expense	(8,030)	(15,514)	(27,190)	(44,117)
Total other income (expense)	664,406	(98,164)	536,191	(368,855)
Income before income taxes	440,369	907,577	862,810	1,701,587
Income tax (benefit) expense	(59,264)	0	29,449	0
Net income	499,633	907,577	833,361	1,701,587
Preferred stock dividends	(80,000)	(80,000)	(240,000)	(240,000)
Net income attributable to common shareholders	$ 419,633	$ 827,577	$ 593,361	$ 1,461,587
Basic income per common share (in Dollars per share)	$ 0.13	$ 0.25	$ 0.18	$ 0.45
Diluted income per common share (in Dollars per share)	$ 0.10	$ 0.18	$ 0.16	$ 0.35
Weighted average shares outstanding:
Basic (in Shares)	3,255,887	3,255,887	3,255,887	3,255,887
Diluted (in Shares)	5,095,665	4,975,665	5,065,665	4,824,652