Condensed Balance Sheets (USD $)	Sep. 30, 2014	Mar. 31, 2014
Current assets:
Cash and cash equivalents	$ 1,038,895	$ 1,689,580
Accounts receivable, net of allowance for doubtful accounts of $8,000 at September 30, 2014 and $8,000 at March 31,2014	790,201	863,220
Inventories, net of reserve for obsolescence of $190,000 at September 30, 2014 and $560,000 at March 31, 2014	2,117,091	2,224,228
Prepaid expenses	205,623	65,387
Total current assets	4,151,810	4,842,415
Equipment, at cost:
Furniture, fixtures and equipment	2,928,355	3,641,037
Customer-site equipment	1,004,842	1,016,265
Accumulated depreciation	(2,987,560)	(3,552,079)
Equipment, net	945,637	1,105,223
Patents, net of accumulated amortization of $229,827 at September 30, 2014 and $215,969 at March 31, 2014	261,143	248,971
Other assets	17,393	14,127
TOTAL ASSETS	5,375,983	6,210,736
Current liabilities:
Accounts payable	544,863	666,159
Accrued compensation	221,821	264,595
Other accrued liabilities	372,541	408,549
Lease payable - short term	59,972	67,057
Deferred rent - short term	30,384	30,384
Total current liabilities	1,229,581	1,436,744
Lease payable - long term	29,010	54,619
Deferred rent - long term	116,474	131,664
Total liabilities	1,375,065	1,623,027
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; 10,673,225 shares issued and outstanding at September 30, 2014 and March 31, 2014	23,575,016	23,545,080
Accumulated (deficit)	(19,574,098)	(18,957,371)
Total shareholders' equity	4,000,918	4,587,709
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 5,375,983	$ 6,210,736