Balance Sheets - USD ($)	Mar. 31, 2020	Mar. 31, 2019
Current assets:
Cash and cash equivalents	$ 385,132	$ 273,348
Restricted cash	0	25,000
Accounts receivable, net of allowance for doubtful accounts of $58,000 at March 31, 2020 and $26,000 at March 31, 2019	881,194	1,009,106
Inventories, net of reserve for obsolescence of $39,000 at March 31, 2020 and $50,000 at March 31, 2019	1,625,901	1,472,543
Prepaid expenses	72,639	130,016
Total current assets	2,964,766	2,910,013
Equipment:
Furniture, fixtures and equipment, at cost	3,130,640	3,061,329
Accumulated depreciation	(2,923,482)	(2,811,761)
Equipment, net	207,158	249,568
Right of use asset	1,317,057	0
Patents, net of accumulated amortization of $291,337 at March 31, 2020 and $266,028 at March 31, 2019	228,296	248,579
Other assets	19,548	19,548
TOTAL ASSETS	4,736,925	3,427,708
Current liabilities:
Accounts payable	444,823	578,956
Line of credit	370,498	0
Accrued compensation	218,806	295,875
Other accrued liabilities	96,077	126,434
Accrued lease liability	278,271	0
Total current liabilities	1,408,475	1,001,265
Long-term liability:
Accrued lease liability	1,144,432	0
Deferred rent	0	74,821
Total liabilities	2,552,907	1,076,086
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 and 11,558,355 issued and outstanding at March 31, 2020 and 2019, respectively	24,232,477	24,201,769
Accumulated (deficit)	(22,048,459)	(21,850,147)
Total shareholders' equity	2,184,018	2,351,622
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 4,736,925	$ 3,427,708