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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
3 Months Ended
Nov. 30, 2016
Nov. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 406,693 $ (72,642)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Stock-based compensation 97,916 121,854
Depreciation expense 193,896 159,048
Amortization expense 29,759 29,758
Equity in income from joint ventures (1,274,004) (983,753)
Deferred income taxes 25,242
Dividends received from joint ventures 320,786
Receivables:    
Trade, excluding joint ventures (762,525) 363,381
Trade, joint ventures 91,385 45,761
Fees for services provided to joint ventures (15,518) (46,892)
Income taxes 84,922 (133,668)
Inventories 274,437 (180,185)
Prepaid expenses and other (180,021) (153,831)
Accounts payable 378,397 258,792
Income tax payable (102,314) 1,783
Accrued liabilities (172,691) (480,440)
Net cash used in operating activities (924,426) (750,248)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Additions to property and equipment (112,589) (264,188)
Proceeds from the sale of available for sale securities 497,896 1,498,574
Additions to patents (58,202) (12,599)
Net cash provided by investing activities 327,105 1,221,787
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividend received by non-controlling interest (200,000)
Repurchase of common stock (71,712) (47,669)
Proceeds from employee stock purchase plan 32,955 34,963
Net cash used in financing activities (238,757) (12,706)
EFFECT OF EXCHANGE RATE CHANGES ON CASH: (30,056) (10,799)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (866,134) 448,034
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 3,395,274 2,623,981
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 2,529,140 $ 3,072,015