7. Income Taxes (Details) - Schedule of Deferred Tax Assets and Liabilities - USD ($)	Mar. 31, 2019	Mar. 31, 2018
Schedule of Deferred Tax Assets and Liabilities [Abstract]
Net operating loss carryforwards	$ 1,345,245	$ 1,482,880
Tax credits	329,032	329,032
Charitable contributions	116	85
Legal damages	1,117,904	1,070,763
Allowance for doubtful accounts	1,576	1,587
Reserve for inventory obsolescence	104,626	88,878
Inventory capitalization	70,633	100,604
Vacation accrual	68,416	73,403
Warranty reserve	24,794	23,697
Deferred revenues	76,009	84,165
Stock options	15,687	15,801
Non-compete agreement	0	1,306
AMT credit	63,500	63,500
Depreciation	5,070	5,533
Deferred tax asset	3,222,608	3,341,234
Less valuation allowance	(3,159,108)	(3,277,734)
Deferred tax asset, net	$ 63,500	$ 63,500