Condensed Balance Sheets (USD $)	Jun. 30, 2013	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 94,268	$ 126,224
Accounts receivable, net of allowance for doubtful accounts of $16,000 at June 30, 2013 and $9,000 at March 31, 2013	1,017,968	985,770
Inventories, net of reserve for obsolescence of $55,000 at June 30, 2013 and $51,000 at March 31, 2013	2,920,059	2,929,302
Prepaid expenses	182,309	65,891
Total current assets	4,214,604	4,107,187
Equipment, at cost:
Furniture, fixtures and equipment	3,517,735	2,691,057
Customer-site equipment	1,003,111	931,060
Equipment-in-progress	56,075	774,004
Accumulated depreciation	(2,780,574)	(2,767,195)
Equipment, net	1,796,347	1,628,926
Patents, net of accumulated amortization of $196,866 at June 30, 2013 and $190,770 at March 31, 2013	243,902	237,606
Other assets	10,613	9,215
TOTAL ASSETS	6,265,466	5,982,934
Current liabilities:
Accounts payable	442,221	823,347
Accrued compensation	315,871	319,116
Other accrued liabilities	443,454	446,171
Lease payable - short term	46,850
Line of credit	725,000
Total current liabilities	1,973,396	1,588,634
Lease payable - long term	121,676
Total liabilities	2,095,072	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 June 30, 2013 and March 31, 2013	21,586,784	21,569,993
Accumulated (deficit)	(17,416,390)	(17,175,693)
Total shareholders' equity	4,170,394	4,394,300
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 6,265,466	$ 5,982,934