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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
9 Months Ended
May 31, 2017
May 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 2,387,391 $ 880,332
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 293,748 325,576
Depreciation expense 580,962 482,576
Amortization expense 89,274 89,275
Equity in income from joint ventures (4,343,159) (3,600,884)
Dividends received from joint ventures 5,179,786 5,449,543
Deferred income taxes 24,939
Receivables:    
Trade, excluding joint ventures (1,442,714) (570,647)
Trade, joint ventures (503,863) (73,522)
Fees for services provided to joint ventures 181,610 97,569
Income taxes (154,171) (314,038)
Inventories (155,011) 17,185
Prepaid expenses and other 19,197 (58,518)
Accounts payable 816,845 692,741
Income tax payable (3,466) (377)
Accrued liabilities (145,203) (363,514)
Net cash provided by operating activities 2,826,166 3,053,297
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of available for sale securities (1,512,816) (212,351)
Additions to property and equipment (760,847) (490,481)
Additions to patents (124,780) (91,836)
Net cash used in investing activities (2,398,443) (794,668)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividend received by non-controlling interest (200,000) (200,000)
Repurchase of common stock (196,164) (97,450)
Proceeds from employee stock purchase plan 46,475 68,633
Proceeds from exercise of stock options 41,000
Net cash used in financing activities (308,689) (228,817)
EFFECT OF EXCHANGE RATE CHANGES ON CASH: (14,144) (27,255)
NET INCREASE IN CASH AND CASH EQUIVALENTS 104,890 2,002,557
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 3,395,274 2,623,981
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 3,500,164 $ 4,626,538