Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Cash Flows [Abstract]
Net income	$ 4,736,490	$ 203,038
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income taxes	(2,649,280)	0
Depreciation and amortization	104,652	60,954
Amortization of right-of-use assets	201,811	0
Change in fair value of common stock warrant	73,000	43,500
Provision for inventory obsolescence	52,000	78,000
Non-cash stock-based compensation	21,669	24,016
Changes in assets and liabilities:
Decrease (increase) in accounts receivable	784,455	(1,101,050)
(Increase) decrease in inventories	(210,397)	1,264,531
Increase in prepaid expenses and other assets	(107,198)	(127,484)
Decrease in accounts payable	(318,494)	(1,249,509)
Increase in accrued legal damages	345,464	252,095
Increase (decrease) in deferred revenues	110,509	(35,936)
Increase (decrease) in accrued payroll, vacation pay & withholdings	118,436	(53,567)
Decrease in operating lease liabilities	(201,811)	0
(Decrease) increase in accrued expenses – related party and other	(140,276)	162,919
Net cash provided by (used in) operating activities	2,921,030	(478,493)
Cash flows from investing activities:
Acquisition of equipment	(133,682)	(121,790)
Net cash used in investing activities	(133,682)	(121,790)
Cash flows from financing activities:
Repayment of line of credit	(120,000)	(200,000)
Payment of warrant liability	(116,500)	0
Proceeds from short-swing profits from an investor, net of expenses	0	123,075
Proceeds from issuance of convertible preferred stock	0	1,000,000
Expenses associated with convertible preferred stock	0	(31,744)
Repayment of long-term debt	0	(2,124)
Repayment of capitalized lease obligations	(6,836)	(6,875)
Net cash (used in) provided by financing activities	(243,336)	882,332
Net increase in cash and restricted cash	2,544,012	282,049
	2,590,727	2,308,678
Supplemental cash flow information:
Taxes paid	0	0
Interest paid	47,494	82,483
	5,134,739	2,590,727
Cash	585,856	307,812
Restricted cash	2,004,871	2,000,866
Cash	3,126,195	585,856
Restricted cash	$ 2,008,544	$ 2,004,871