Condensed Balance Sheets (USD $)	Dec. 31, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 6,227	$ 120,008
Accounts receivable, net of allowance for doubtful accounts of $5,000 at December 31, 2011 and $9,000 at March 31, 2011	1,426,766	1,160,008
Inventories, net of reserve for obsolescence of $60,000 at December 31, 2011 and $60,000 at March 31, 2011	2,677,008	2,603,873
Prepaid expenses	75,296	74,635
Total current assets	4,185,297	3,958,524
Equipment, at cost:
Furniture, fixtures and equipment	3,126,154	2,578,637
Customer-site equipment	814,357	814,357
Accumulated depreciation	(2,411,105)	(2,224,371)
Equipment, net	1,529,406	1,168,623
Patents, net of accumulated amortization of $166,453 at December 31, 2011 and $157,971 at March 31, 2011	271,166	260,097
Other assets		23,624
TOTAL ASSETS	5,985,869	5,410,868
Current liabilities:
Accounts payable	1,115,969	673,538
Accrued compensation	331,344	261,269
Other accrued liabilities	544,126	287,067
Line of credit	756,237	435,000
Total current liabilities	2,747,676	1,656,874
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; 6,455,100 shares issued and outstanding	19,837,868	19,783,361
Accumulated (deficit)	(16,599,675)	(16,029,367)
Total shareholders' equity	3,238,193	3,753,994
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 5,985,869	$ 5,410,868