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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 1,641,191 $ 1,198,589
Adjustments to reconcile net income to net cash used in operating activities:    
Stock-based compensation 357,980 103,267
Depreciation expense 217,723 208,486
Amortization expense 64,443 62,177
Equity in income from joint ventures (2,004,162) (1,741,328)
Deferred income taxes 19,010
Dividends received from joint ventures 1,486,705 63,937
Changes in current assets and liabilities:    
Trade, excluding joint ventures (343,517) (1,364,409)
Trade, joint ventures 181,670 171,099
Fees for services provided to joint ventures 85,177 (7,874)
Income taxes (93,513) (101,908)
Inventories (1,075,014) (530,401)
Prepaid expenses and other 238,268 (250,280)
Accounts payable 165,553 1,278,940
Income tax payable (6,949) 102,618
Accrued liabilities (1,673,171) (622,696)
Net cash used in operating activities (738,606) (1,429,783)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Additions to property and equipment (106,300) (87,250)
Proceeds from the sale of available for sale securities 1,588,180
Purchase of available for sale securities (3,257)
Additions to patents (17,930) (31,423)
Net cash provided by (used in) investing activities 1,463,950 (121,930)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividend received by non-controlling interest (200,000)
Investment by non-controlling interest 134,034
Dividends paid on NTIC common stock (545,061)
Proceeds from option exercises 15,375
Proceeds from employee stock purchase plan 17,681 12,481
Net cash used in financing activities (393,346) (172,144)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS: 23,930 (9,131)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 355,928 (1,732,988)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 4,163,023 6,360,201
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 4,518,951 $ 4,627,213