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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
May 31, 2013
May 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 2,791,460 $ 3,180,035
Adjustments to reconcile net income to net cash used in operating activities:    
Expensing of fair value of stock options vested 213,347 216,712
Depreciation expense 316,118 255,641
Amortization expense 53,264 113,624
Loss on disposal of assets 13,842  
Equity in income from joint ventures (3,733,069) (4,405,327)
Receivables:    
Trade, excluding joint ventures (306,554) (341,903)
Trade, joint ventures (385,542) 41,562
Fees for services receivables, joint ventures 199,532 199,871
Income taxes (116,816) (6,403)
Inventories (1,085,743) (117,023)
Prepaid expenses and other 195,848 (539,868)
Accounts payable (526,505) (479,801)
Income tax payable 2,783 138,132
Accrued liabilities (684,857) 571,824
Net cash used in operating activities (3,052,892) (1,172,924)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Dividends received from joint ventures 3,017,586 3,045,544
Additions to property and equipment (1,160,344) (402,620)
Effect of NTI Asean consolidation on cash (Note 2) 1,612,768  
Additions to patents (167,652) (125,555)
Net cash provided by investing activities 3,302,358 2,517,369
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of note payable (57,089) (57,089)
Dividend received by non-controlling interest (1,352,841)  
Proceeds from employee stock purchase plan 56,739 55,410
Proceeds from exercise of stock options 157,021 15,040
Net cash (used in) provided by financing activities (1,196,170) 13,361
EFFECT OF EXCHANGE RATE CHANGES ON CASH: (14,686) (158,270)
NET INCREASE IN CASH AND CASH EQUIVALENTS (961,390) 1,199,536
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 4,137,547 3,266,362
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 3,176,157 $ 4,465,898