Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Cash Flows [Abstract]
Net income	$ 833,361	$ 1,701,587
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Deferred income taxes	63,883	0
Depreciation and amortization	92,820	74,353
Amortization of right of use assets	159,833	150,783
Provision for inventory obsolescence	25,000	57,000
Forgiveness of PPP Loan	(722,577)	0
Change in fair value of common stock warrant	0	73,000
Non-cash stock-based compensation	15,829	16,393
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	(469,478)	(616,640)
Decrease (increase) in inventories	136,815	(193,247)
Decrease (increase) in prepaid expenses & other assets	148,743	(86,996)
Decrease in accounts payable and other accrued liabilities	(353,905)	(165,350)
(Decrease) increase in accrued payroll, vacation pay and payroll taxes	(54,983)	93,591
(Decrease) increase in deferred revenues	(54,978)	185,522
Decrease in operating lease liabilities	(159,833)	(150,783)
Increase in accrued legal damages	180,124	258,761
Net cash (used in) provided by operating activities	(159,346)	1,397,974
Cash flows from investing activities:
Purchases of equipment	(65,140)	(102,341)
Net cash used in investing activities	(65,140)	(102,341)
Cash flows from financing activities:
Proceeds from SBA PPP Loan	722,577	0
Repayment of line of credit	(680,000)	(90,000)
Payment of warrant liability	0	(116,500)
Repayment of finance lease obligations	(49)	(4,950)
Net cash provided by (used in) financing activities	42,528	(211,450)
Net (decrease) increase in cash and restricted cash	(181,958)	1,084,183
	5,134,739	2,590,727
Supplemental cash flow information:
Taxes paid	0	0
Interest paid	19,497	35,080
	4,952,781	3,674,910
Cash	3,126,195	585,856
Restricted cash	2,008,544	2,004,871
Cash	2,941,731	1,667,364
Restricted cash	$ 2,011,050	$ 2,007,546