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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 1,503,691 $ 1,539,412
Adjustments to reconcile net income to net cash used in operating activities:    
Expensing of fair value of stock options vested 137,550 145,046
Depreciation expense 211,874 163,171
Amortization expense 35,122 77,493
Loss on disposal of assets 13,845  
Equity in income from joint ventures (2,292,734) (2,582,355)
Receivables:    
Trade, excluding joint ventures (223,731) (290,512)
Trade, joint ventures (247,466) (316,174)
Fees for services receivables, joint ventures 221,099 164,795
Income taxes (51,111) (822)
Inventories (990,720) (111,041)
Prepaid expenses and other (91,869) (425,711)
Accounts payable (574,037) (902,749)
Income tax payable (2,748) (51,921)
Accrued liabilities (1,094,446) (198,639)
Net cash used in operating activities (3,445,681) (2,790,007)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Dividends received from joint ventures 2,953,435 3,036,344
Additions to property and equipment (102,259) (80,698)
Effect of NTI Asean consolidation on cash (Note 2) 1,612,768  
Additions to patents (114,882) (85,176)
Net cash provided by investing activities 4,349,062 2,870,470
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of note payable (38,059) (38,059)
Dividend received by non-controlling interest (872,841)  
Proceeds from employee stock purchase plan 28,938 22,414
Proceeds from exercise of stock options 102,815 15,040
Net cash provided by financing activities (779,147) (605)
EFFECT OF EXCHANGE RATE CHANGES ON CASH: (636) (10,422)
NET INCREASE IN CASH AND CASH EQUIVALENTS 123,598 69,436
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 4,137,547 3,266,362
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 4,261,145 $ 3,335,798