Balance Sheets - USD ($)	Mar. 31, 2021	Mar. 31, 2020
Current assets:
Cash	$ 1,474,339	$ 385,132
Accounts receivable, net of allowance for doubtful accounts of $35,000 at March 31, 2021 and $58,000 at March 31, 2020	1,024,370	881,194
Inventories, net of reserve for obsolescence of $70,000 at March 31, 2021 and $39,000 at March 31, 2020	1,445,134	1,625,901
Prepaid expenses and other assets	154,151	72,639
Total current assets	4,097,994	2,964,766
Equipment:
Furniture, fixtures and equipment, at cost	2,695,297	3,130,640
Accumulated depreciation	(2,429,580)	(2,923,482)
Equipment, net	265,717	207,158
Right of use asset	1,060,971	1,317,057
Patents, net of accumulated amortization of $317,821 at March 31, 2021 and $291,337 at March 31, 2020	213,368	228,296
Other assets	20,496	19,548
TOTAL ASSETS	5,658,546	4,736,925
Current liabilities:
Accounts payable	389,088	444,823
Line of credit	0	370,498
Secured notes	20,397	0
Accrued compensation	181,686	218,806
Other accrued liabilities	282,102	96,077
Accrued lease liability	302,978	278,271
Total current liabilities	1,176,251	1,408,475
Long-term liability:
Secured notes	220,263	0
Accrued lease liability	926,808	1,144,432
Unsecured promissory note	533,118	0
Total liabilities	2,856,440	2,552,907
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 issued and outstanding at March 31, 2021 and 2020	24,265,831	24,232,477
Accumulated (deficit)	(21,463,725)	(22,048,459)
Total shareholders' equity	2,802,106	2,184,018
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 5,658,546	$ 4,736,925