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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
3 Months Ended
Nov. 30, 2017
Nov. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 1,198,589 $ 406,693
Adjustments to reconcile net income to net cash used in operating activities:    
Stock-based compensation 103,267 97,916
Depreciation expense 208,486 193,896
Amortization expense 62,177 29,759
Equity in income from joint ventures (1,741,328) (1,274,004)
Deferred income taxes 25,242
Dividends received from joint ventures 63,937
Receivables:    
Trade, excluding joint ventures (1,364,409) (762,525)
Trade, joint ventures 171,099 91,385
Fees for services provided to joint ventures (7,874) (15,518)
Income taxes (101,908) 84,922
Inventories (530,401) 274,437
Prepaid expenses and other (250,280) (180,021)
Accounts payable 1,278,940 378,397
Income tax payable 102,618 (102,314)
Accrued liabilities (622,696) (172,691)
Net cash used in operating activities (1,429,783) (924,426)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Additions to property and equipment (87,250) (112,589)
Proceeds from the sale of available for sale securities 497,896
Purchase of available for sale securities (3,257)
Additions to patents (31,423) (58,202)
Net cash (used in) provided by investing activities (121,930) 327,105
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividend received by non-controlling interest (200,000) (200,000)
Repurchase of common stock (71,712)
Proceeds from option exercises 15,375
Proceeds from employee stock purchase plan 12,481 32,955
Net cash used in financing activities (172,144) (238,757)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS: (9,131) (30,056)
NET DECREASE IN CASH AND CASH EQUIVALENTS (1,732,988) (866,134)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 6,360,201 3,395,274
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 4,627,213 $ 2,529,140