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Consolidated Statements of Cash Flows - USD ($)
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 2,517,360 $ 5,538,412 $ 4,753,501
Adjustments to reconcile net income to net cash (used in) provided by operating activities:      
Stock-based compensation 495,683 454,015 306,451
Depreciation expense 530,449 454,889 435,678
Amortization 87,663 86,652 71,405
Loss on disposal of assets 20,689 472 84,396
Equity in income from joint ventures (5,936,565) (5,920,603) (5,237,711)
Dividends received from joint ventures 2,983,338 7,431,306 3,155,737
Deferred income taxes $ 131,777 (230,883) $ 124,935
Increase in allowance on doubtful accounts $ 20,000
Gain on sale of equipment $ (31,708)
Receivables:      
Trade, excluding joint ventures (699,088) $ (249,965) $ (894,888)
Trade, joint ventures 305,909 (91,852) (124,891)
Fees for services provided to joint ventures 1,163,737 (166,882) 213,002
Income taxes (258,329) 150,764 (98,427)
Inventories (1,679,654) (825,176) (1,017,188)
Prepaid expenses and other 25,028 (62,969) 363,337
Accounts payable 127,907 365,797 78,623
Income tax payable 31,667 (4,191) 8,435
Accrued liabilities (634,823) 473,126 (311,693)
Net cash (used in) provided by operating activities (755,544) 7,422,912 $ 1,910,702
CASH FLOWS FROM INVESTING ACTIVITIES:      
Investment in joint venture 0 (110,988)
Additions to property and equipment $ (1,438,919) $ (1,602,441) $ (1,488,059)
Effect of subsidiary consolidation on cash $ 1,612,768
Purchase of available for sale securities $ (6,019,766)
Proceeds from sale of available for sale securities $ 3,492,325 500,000
Additions to patents (152,182) (224,185) $ (255,259)
Net cash provided by (used in) investing activities $ 1,901,224 (7,457,380) (130,550)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Repayment of note payable (933,414) (76,119)
Dividend received by non-controlling interest $ (1,160,000) (1,440,000) $ (1,752,842)
Investment by non-controlling interest 15,625 $ 36,956
Repurchase of common stock (24,346)
Proceeds from employee stock purchase plan 57,981 $ 42,580 $ 56,739
Proceeds from exercise of stock options 236,089 479,460 208,354
Net cash used in financing activities (874,651) (1,814,418) (1,563,867)
EFFECT OF EXCHANGE RATE CHANGES ON CASH: (124,065) 11,646 (39,574)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS 146,964 (1,837,239) 176,711
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 2,477,017 4,314,258 4,137,547
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 2,623,981 $ 2,477,017 $ 4,314,258