Condensed Balance Sheets - USD ($)	Dec. 31, 2015	Mar. 31, 2015
Current assets:
Cash and cash equivalents	$ 107,214	$ 258,656
Accounts receivable, net of allowance for doubtful accounts of $7,000 at December 31, 2015 and $11,500 at March 31, 2015	861,945	965,355
Inventories, net of reserve for obsolescence of $280,762 at December 31, 2015 and $240,000 at March 31, 2015	2,000,934	2,337,654
Prepaid expenses	130,883	109,678
Total current assets	3,100,976	3,671,343
Equipment, at cost:
Furniture, fixtures and equipment	3,925,861	3,917,386
Accumulated depreciation	(3,336,285)	(3,140,453)
Equipment, net	589,576	776,933
Patents, net of accumulated amortization of $173,900 at December 31, 2015 and $153,494 at March 31, 2015	257,075	257,356
Other assets	15,926	20,135
TOTAL ASSETS	3,963,553	4,725,767
Current liabilities:
Accounts payable	442,702	675,411
Accrued compensation	203,328	262,195
Other accrued liabilities	246,230	324,926
Line of credit	235,986
Deferred rent	30,384	30,384
Total current liabilities	1,158,630	1,292,916
Long-term liabilities:
Line of credit		64,000
Deferred rent	78,492	101,280
Total liabilities	$ 1,237,122	$ 1,458,196
Commitments and contingencies (Note 4)
Shareholders' equity:
Preferred stock, no par value: 10,000,000 shares authorized; none issued and outstanding
Common stock and additional paid-in capital, no par value: 100,000,000 shares authorized; 10,673,225 shares issued and outstanding at December 31 and March 31, 2015	$ 23,664,084	$ 23,607,688
Accumulated (deficit)	(20,937,653)	(20,340,117)
Total shareholders' equity	2,726,431	3,267,571
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 3,963,553	$ 4,725,767