Condensed Balance Sheets (USD $)	Sep. 30, 2013	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 51,383	$ 126,224
Accounts receivable, net of allowance for doubtful accounts of $5,000 at September 30, 2013 and $9,000 at March 31, 2013	1,030,915	985,770
Inventories, net of reserve for obsolescence of $60,000 at September 30, 2013 and $51,000 at March 31, 2013	2,790,985	2,929,302
Prepaid expenses	133,200	65,891
Total current assets	4,006,483	4,107,187
Equipment, at cost:
Furniture, fixtures and equipment	3,493,115	2,691,057
Customer-site equipment	1,003,111	931,060
Equipment-in-progress	73,242	774,004
Accumulated depreciation	(2,870,940)	(2,767,195)
Equipment, net	1,698,528	1,628,926
Patents, net of accumulated amortization of $203,341 at September 30, 2013 and $190,770 at March 31, 2013	254,206	237,606
Other assets	11,504	9,215
TOTAL ASSETS	5,970,721	5,982,934
Current liabilities:
Line of credit	534,192
Accounts payable	611,609	823,347
Accrued compensation	233,346	319,116
Other accrued liabilities	378,456	446,171
Lease payable - short term	63,012
Total current liabilities	1,820,615	1,588,634
Lease payable - long term	88,982
Total liabilities	1,909,597	1,588,634
Commitments and contingencies
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; 8,210,100 shares issued and outstanding at September 30, 2013 and March 31, 2013	21,598,064	21,569,993
Accumulated (deficit)	(17,536,940)	(17,175,693)
Total shareholders' equity	4,061,124	4,394,300
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 5,970,721	$ 5,982,934