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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 3,575,646 $ 3,995,888
Adjustments to reconcile net income to net cash used in operating activities:    
Expensing of fair value of stock options vested 288,396 177,937
Depreciation expense 351,118 335,877
Amortization expense 128,921 157,728
Loss on disposal of assets 870 (52,425)
Equity in income from joint ventures (5,519,795) (5,536,243)
Deferred income taxes 5,605 321,600
Receivables:    
Trade, excluding joint ventures (156,979) (287,547)
Trade, joint ventures 415,123 66,415
Fees for services receivables, joint ventures 812,978 (829,097)
Income taxes (61,144)  
Inventories (365,800) (203,685)
Prepaid expenses and other (220,837) (242,237)
Accounts payable (123,512) 311,377
Income tax payable (165,308) 21,260
Accrued liabilities 646,024 626,929
Net cash used in operating activities (388,694) (1,136,223)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Investment in joint ventures (484,545) (38,217)
Dividends received from joint ventures 3,060,545 2,838,437
Additions to property and equipment (1,037,468) (567,257)
Proceeds from sale of property and equipment   100,000
Additions to patents (187,064) (148,048)
Net cash provided by investing activities 1,351,468 2,184,915
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of note payable (76,119) (59,270)
Dividend paid to non-controlling interest   (33,173)
Proceeds from employee stock purchase plan 55,410 36,726
Proceeds from exercise of stock options 34,531 464,436
Net cash provided by financing activities 13,822 408,719
EFFECT OF EXCHANGE RATE CHANGES ON CASH: (105,411) 32,789
NET INCREASE IN CASH AND CASH EQUIVALENTS 871,185 1,490,200
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 3,266,362 1,776,162
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 4,137,547 $ 3,266,362