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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
9 Months Ended
May 31, 2016
May 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 880,332 $ 2,474,631
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 325,576 378,421
Depreciation expense 482,576 385,126
Amortization expense 89,275 65,747
Loss on disposal of assets 20,689
Equity in income from joint ventures (3,600,884) (4,806,247)
Dividends received from joint ventures 5,449,543 2,767,771
Deferred income taxes (27,558)
Receivables:    
Trade, excluding joint ventures (570,647) (896,173)
Trade, joint ventures (73,522) 324,338
Fees for services provided to joint ventures 97,569 1,257,998
Income taxes (314,038) (217,055)
Inventories 17,185 (887,748)
Prepaid expenses and other (58,518) (95,316)
Accounts payable 692,741 82,550
Income tax payable (377) 22,943
Accrued liabilities (363,514) (813,896)
Net cash provided by operating activities 3,053,297 36,221
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from the sale of available for sale securities 2,991,919
Purchase of available for sale securities (212,351)
Additions to property and equipment (490,481) (1,098,035)
Additions to patents (91,836) (138,786)
Net cash (used in) provided by investing activities (794,668) 1,755,098
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividend received by non-controlling interest (200,000) (560,000)
Repurchase of common stock (97,450)
Proceeds from employee stock purchase plan 68,633 57,980
Proceeds from exercise of stock options 99,450
Net cash used in financing activities (228,817) (402,570)
EFFECT OF EXCHANGE RATE CHANGES ON CASH: (27,255) (72,195)
NET INCREASE IN CASH AND CASH EQUIVALENTS 2,002,557 1,316,554
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 2,623,981 2,477,017
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 4,626,538 $ 3,793,571