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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 1,539,412 $ 1,896,093
Adjustments to reconcile net income to net cash used in operating activities:    
Expensing of fair value of stock options vested 145,046 109,880
Depreciation expense 163,171 168,810
Amortization expense 77,493 78,724
Equity in income from joint ventures (2,582,355) (2,824,790)
Gain on sale of property and equipment   (52,425)
Receivables:    
Trade, excluding joint ventures (290,512) (901,627)
Trade, joint ventures (316,174) (95,677)
Fees for services receivables, joint ventures 164,795 (380,292)
Income taxes (822)  
Inventories (111,041) (508,321)
Prepaid expenses and other (425,711) (275,004)
Accounts payable (902,749) (120,142)
Income tax payable (51,921) 149,863
Accrued liabilities (198,639) 338,515
Net cash used in operating activities (2,790,007) (2,416,393)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Investment in joint ventures   (38,217)
Dividends received from joint ventures 3,036,344 2,195,506
Additions to property and equipment (80,698) (122,237)
Proceeds from sale of property and equipment   100,000
Additions to patents (85,176) (43,024)
Net cash provided by investing activities 2,870,470 2,092,028
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of note payable (38,059) (21,210)
Proceeds from employee stock purchase plan 22,414 17,745
Proceeds from exercise of stock options 15,040 406,474
Net cash (used in) provided by financing activities (605) 403,009
EFFECT OF EXCHANGE RATE CHANGES ON CASH: (10,422) 9,409
NET INCREASE IN CASH AND CASH EQUIVALENTS 69,436 88,053
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 3,266,362 1,776,162
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 3,335,798 $ 1,864,215