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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Nov. 30, 2013
Nov. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 1,304,418 $ 758,536
Adjustments to reconcile net income to net cash used in operating activities:    
Expensing of fair value of stock options vested 127,927 43,393
Depreciation expense 116,690 105,688
Amortization expense 21,434 17,445
Loss on disposal of assets 2,178  
Loss on impairment of joint venture 50,000  
Equity in income from joint ventures (1,427,748) (1,154,296)
Increase in allowance for doubtful accounts 10,000  
Receivables:    
Trade, excluding joint ventures (302,098) (205,361)
Trade, joint ventures 112,869 (207,957)
Fees for services provided to joint ventures (374,345) 330,564
Income taxes 52,837 (196,635)
Inventories (309,071) (865,175)
Prepaid expenses and other (293,493) (151,029)
Accounts payable 546,639 24,296
Income tax payable 320 4,191
Accrued liabilities 203,699 22,201
Net cash used in operating activities (207,744) (1,474,140)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Dividends received from joint ventures 12,500 2,676,337
Additions to property and equipment (166,299) (67,165)
Effect of NTI Asean consolidation on cash   1,612,768
Additions to patents (58,639) (68,665)
Net cash (used in) provided by investing activities (212,438) 4,153,275
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of note payable (19,030) (19,030)
Dividend received by non-controlling interest   (72,842)
Proceeds from employee stock purchase plan 21,255 28,938
Proceeds from exercise of stock options 7,650 102,815
Net cash provided by financing activities 9,875 39,881
EFFECT OF EXCHANGE RATE CHANGES ON CASH: 3,420 (37,527)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (406,887) 2,681,489
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 4,314,258 4,137,547
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 3,907,371 $ 6,819,036