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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
May 31, 2012
May 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 3,180,035 $ 2,918,248
Adjustments to reconcile net income to net cash used in operating activities:    
Expensing of fair value of stock options vested 216,712 150,109
Depreciation expense 255,641 250,076
Amortization expense 113,624 118,670
Equity in income from joint ventures (4,405,327) (4,549,267)
Gain on sale of property and equipment   (52,425)
Receivables:    
Trade, excluding joint ventures (341,903) (101,866)
Trade, joint ventures 41,562 226,269
Fees for services receivables, joint ventures 199,871 (666,807)
Income taxes (6,403)  
Inventories (117,023) (763,834)
Prepaid expenses and other (539,868) (132,879)
Accounts payable (479,801) (92,502)
Income tax payable 138,132 202,312
Accrued liabilities 571,824 680,515
Net cash used in operating activities (1,172,924) (1,813,381)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Investment in joint ventures   (38,217)
Dividends received from joint ventures 3,045,544 2,767,977
Additions to property and equipment (402,620) (437,613)
Proceeds from sale of property and equipment   100,000
Additions to patents (125,555) (104,562)
Net cash provided by investing activities 2,517,369 2,287,585
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of note payable (57,089) (40,240)
Proceeds from employee stock purchase plan 55,410 36,726
Proceeds from exercise of stock options 15,040 406,431
Net cash provided by financing activities 13,361 402,917
EFFECT OF EXCHANGE RATE CHANGES ON CASH: (158,270) 23,638
NET INCREASE IN CASH AND CASH EQUIVALENTS 1,199,536 900,759
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 3,266,362 1,776,162
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 4,465,898 $ 2,676,921