Condensed Balance Sheets (Unaudited) - USD ($)	Sep. 30, 2020	Mar. 31, 2020
Current assets:
Cash and cash equivalents	$ 1,007,192	$ 385,132
Accounts receivable, net of allowance for doubtful accounts of $27,000 at September 30, 2020 and $58,000 at March 31, 2020	1,038,240	881,194
Inventories, net of reserve for obsolescence of $62,000 at September 30, 2020 and $39,000 at March 31, 2020	1,557,325	1,625,901
Prepaid expenses	70,882	72,639
Total current assets	3,673,639	2,964,866
Equipment, at cost:
Furniture, fixtures and equipment	2,969,584	3,130,640
Accumulated depreciation	(2,794,340)	(2,923,482)
Equipment, net	175,244	207,158
Right of use asset	1,192,787	1,317,057
Patents, net of accumulated amortization of $306,383 at September 30, 2020 and $291,337 at March 31, 2020	223,178	228,296
Other assets	20,495	19,548
TOTAL ASSETS	5,285,343	4,736,925
Current liabilities:
Accounts payable	297,229	444,823
Line of credit	416,506	370,498
Accrued compensation	194,303	218,806
Other accrued liabilities	187,094	96,077
Accrued lease liability	288,367	278,271
Total current liabilities	1,383,499	1,408,475
Long-term liability:
Accrued lease liability, net of current portion	1,082,608	1,144,432
Economic injury disaster loan	150,640	0
Unsecured promissory note	598,567	0
Total liabilities	3,215,314	2,552,907
Commitments and contingencies (Note 4)	0	0
Shareholders' equity:
Preferred stock, no par value: 10,000,000 shares authorized; none issued and outstanding	0	0
Common stock and additional paid-in capital, no par value: 100,000,000 shares authorized; 11,582,641 shares issued and outstanding at September 30, 2020 and March 31, 2020	24,249,007	24,232,477
Accumulated (deficit)	(22,178,978)	(22,048,459)
Total shareholders' equity	2,070,029	2,184,018
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 5,285,343	$ 4,736,925