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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Nov. 30, 2011
Nov. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 935,421 $ 894,874
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Expensing of fair value of stock options vested 72,523 44,143
Depreciation expense 80,887 85,492
Amortization expense 38,713 39,723
Equity in income from joint ventures (1,357,680) (1,695,131)
Receivables:    
Trade, excluding joint ventures (410,029) 363,755
Trade, joint ventures 144,157 (277,933)
Fees for services receivables, joint ventures (38,883) (404,938)
Income taxes (1,396)  
Inventories (158,234) (326,327)
Prepaid expenses and other (349,112) (260,596)
Accounts payable (489,032) (309,844)
Income tax payable (17,512) (27,036)
Accrued liabilities (235,366) (118,983)
Net cash used in operating activities (1,785,543) (1,992,801)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Investment in joint ventures   (38,217)
Dividends received from joint ventures 2,031,450 1,368,599
Additions to property and equipment (51,031) (75,269)
Additions to patents (44,702) (10,238)
Net cash provided by investing activities 1,935,717 1,244,875
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of note payable (19,029) (9,211)
Proceeds from employee stock purchase plan 22,414 17,745
Proceeds from exercise of stock options   261,333
Net cash provided by financing activities 3,385 269,867
EFFECT OF EXCHANGE RATE CHANGES ON CASH: (12,550) 4,341
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 141,009 (473,718)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 3,266,362 1,776,162
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 3,407,371 $ 1,302,444