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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
3 Months Ended
Nov. 30, 2019
Nov. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 1,359,539 $ 1,641,191
Adjustments to reconcile net income to net cash used in operating activities:    
Stock-based compensation 318,818 357,980
Depreciation expense 211,132 217,723
Amortization expense 58,521 64,443
Equity in income from joint ventures (1,293,991) (2,004,162)
Dividends received from joint ventures 205,432 1,486,705
Deferred income taxes 114,166 19,010
Changes in current assets and liabilities:    
Trade, excluding joint ventures (534,080) (343,517)
Trade, joint ventures 182,798 181,670
Fees for services provided to joint ventures (97,864) 85,177
Income taxes 262,440 (93,513)
Inventories (734,384) (1,075,014)
Prepaid expenses and other (97,035) 238,268
Accounts payable 518,930 165,553
Income tax payable 7,970 (6,949)
Accrued liabilities (2,049,549) (1,673,171)
Net cash used in operating activities (1,567,157) (738,606)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from the sale of available for sale securities 3,100,000 1,588,180
Purchase of available for sale securities (2,521,837)  
Purchases of property and equipment (197,370) (106,300)
Investments in patents (27,493) (17,930)
Net cash provided by investing activities 353,300 1,463,950
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividend received by non-controlling interest
Investment by non-controlling interest 134,034
Dividends paid on NTIC common stock (590,878) (545,061)
Proceeds from employee stock purchase plan 35,607 17,681
Principal payments on finance lease obligations
Net cash used in financing activities (555,271) (393,346)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS: 19,166 23,930
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (1,749,962) 355,928
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 5,856,758 4,163,023
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 4,106,796 $ 4,518,951