Condensed Balance Sheets (USD $)	May 31, 2012	Aug. 31, 2011	May 31, 2011	Aug. 31, 2010
Cash and cash equivalents	$ 12,736,998	$ 17,135,968	$ 18,573,270	$ 8,483,565
Accounts receivable, net of allowance for doubtful accounts of $20,000	248,626	397,264
Related party trade accounts receivable	14,757	408,323
Inventories, net	2,318,260	2,406,214
Other current assets	151,363	121,148
Total current assets	15,470,004	20,468,917
Property and equipment, net	1,444,712	1,445,897
Patents, net	9,297	25,092
Total assets	16,924,013	21,939,906
Accounts payable	237,339	301,936
Accrued liabilities	199,828	332,004
Deferred revenue - current portion	99,534	42,214
Total current liabilities	536,701	676,154
Deferred revenue - net of current portion	132,521	192,158
Total liabilities	669,222	868,312
Commitments and contingencies
Preferred stock, $.001 par value; 10,000,000 shares authorized; no shares issued and outstanding
Common stock, $.001 par value; 80,000,000 shares authorized, 29,753,191 and 29,686,154 shares issued	29,778	29,686
Additional paid-in capital	51,529,691	50,458,729
Treasury stock, 24,331 shares at cost	(234)	(234)
Accumulated deficit	(35,304,444)	(29,416,587)
Total stockholders' equity	16,254,791	21,071,594
Total liabilities and stockholders' equity	$ 16,924,013	$ 21,939,906