Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from (used in) operating activities:
Net income (loss)	$ 584,734	$ (198,312)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Extinguishment of debt income	(598,567)	0
Depreciation and amortization	88,955	137,810
Stock-based compensation expense related to stock options	33,354	30,708
(Recovery from) provision for doubtful accounts, net change	(23,000)	32,000
Provision for (recovery from) for inventory obsolescence, net change	31,000	(11,000)
Other income from release of account payable	(56,435)	0
Change in operating assets and liabilities:
Right of use asset, net	63,169	30,825
Accounts receivable	(120,176)	95,912
Inventories	149,767	(142,358)
Prepaid expenses and other assets	(82,460)	36,490
Accounts payable	700	(134,133)
Accrued compensation and other accrued liabilities	148,905	(107,426)
Net cash provided by (used in) operating activities	219,946	(229,484)
Cash flows (used in) investing activities:
Acquisition of property and equipment	(30,020)	(48,324)
Patent costs	(15,166)	(5,906)
Net cash (used in) investing activities	(45,186)	(54,230)
Cash flows from (used in) financing activities:
(Paydown of) borrowings from credit facility, net change	(370,498)	370,498
Proceeds from secured notes	153,260	0
Proceeds from PPP loans	1,131,685	0
Net cash provided by (used in) financing activities	914,447	370,498
Net increase in cash	1,089,207	86,784
Cash, beginning of fiscal year	385,132	298,348
Cash, end of fiscal year	1,474,339	385,132
Supplemental disclosure of non-cash investing activity information:
Acquisition of property and equipment through secured note payable	87,400	0
Lease asset	0	1,555,150
Lease liability	0	(1,619,842)
Supplemental disclosures of cash flow information:
Cash paid during the year for interest	80,251	43,515
Property and equipment additions transferred from prepaid expenses	$ 0	$ 20,887