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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
May 31, 2014
May 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 4,086,744 $ 2,791,460
Adjustments to reconcile net income to net cash used in operating activities:    
Stock-based compensation 345,319 213,347
Depreciation expense 335,350 316,118
Amortization expense 64,736 53,264
Loss on disposal of assets 2,176 13,842
Equity in income from joint ventures (4,416,664) (3,733,069)
Increase in allowance on doubtful accounts 20,000  
Receivables:    
Trade, excluding joint ventures 80,459 (306,554)
Trade, joint ventures 90,860 (385,542)
Fees for services provided to joint ventures (387,356) 199,532
Income taxes (155,319) (116,816)
Inventories (397,090) (1,085,743)
Prepaid expenses and other (455,900) 195,848
Accounts payable (227,486) (526,505)
Income tax payable (4,081) 2,783
Accrued liabilities 411,211 (684,857)
Net cash used in operating activities (607,041) (3,052,892)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from the sale of investment in joint venture 134,606  
Dividends received from joint ventures 7,307,895 3,017,586
Additions to property and equipment (428,536) (1,160,344)
Effect of subsidiary consolidation on cash   1,612,768
Additions to patents (189,393) (167,652)
Net cash provided by investing activities 6,824,572 3,302,358
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of note payable (933,414) (57,089)
Dividend received by non-controlling interest (1,440,000) (1,352,841)
Investment by non-controlling interest 34,770  
Proceeds from employee stock purchase plan 42,514 56,739
Proceeds from exercise of stock options 305,996 157,021
Net cash used in financing activities (1,990,134) (1,196,170)
EFFECT OF EXCHANGE RATE CHANGES ON CASH: 8,134 (14,686)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 4,235,531 (961,390)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 4,314,258 4,137,547
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 8,549,789 $ 3,176,157