Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Cash Flows [Abstract]
Net income	$ 600,057	$ 4,736,490
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Deferred income taxes	(27,027)	(2,649,280)
Depreciation and amortization	125,120	104,652
Amortization of right-of-use assets	214,793	201,811
Forgiveness of PPP Loan	(722,577)	0
Change in fair value of common stock warrant	0	73,000
Provision for inventory obsolescence	25,000	52,000
Non-cash stock-based compensation	21,996	21,669
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	(521,677)	784,455
Increase in inventories	(370,310)	(210,397)
Decrease (increase) in prepaid expenses and other assets	189,889	(107,198)
Increase (decrease) in accounts payable	166,338	(318,494)
Increase in accrued legal damages	231,474	345,464
Increase in deferred revenues	10,839	110,509
(Decrease) increase in accrued payroll, vacation pay & withholdings	(55,500)	118,436
Decrease in operating lease liabilities	(214,793)	(201,811)
Increase (decrease) in accrued expenses – related party and other	70,762	(140,276)
Net cash (used in) provided by operating activities	(255,616)	2,921,030
Cash flows from investing activities:
Acquisition of equipment	(67,902)	(133,682)
Net cash used in investing activities	(67,902)	(133,682)
Cash flows from financing activities:
Payment of warrant liability	0	(116,500)
Payment of dividends	(80,000)	0
Proceeds from PPP loans	1,445,154	0
Repayment of line of credit	(680,000)	(120,000)
Repayment of capitalized lease obligations	(50)	(6,836)
Net cash provided by (used in) financing activities	685,104	(243,336)
Net increase in cash and restricted cash	361,586	2,544,012
	5,134,739	2,590,727
Supplemental cash flow information:
Taxes paid	0	0
Interest paid	19,497	47,494
	5,496,325	5,134,739
Cash	3,126,195	585,856
Restricted cash	2,008,544	2,004,871
Cash	3,485,275	3,126,195
Restricted cash	$ 2,011,050	$ 2,008,544