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Consolidated Statements of Cash Flows - USD ($)
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 5,815,622 $ 7,222,847
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 1,431,925 413,010
Depreciation expense 841,236 853,555
Amortization expense 261,724 252,312
Equity in income from joint ventures (7,225,518) (7,527,383)
Dividends received from joint ventures 5,039,041 3,697,503
Gain on disposal of property and equipment (36,098) (10,723)
Deferred income taxes (89,637) 186,808
Changes in current assets and liabilities:    
Trade, excluding joint ventures (50,315) (4,372,619)
Trade, joint ventures (62,967) (69,754)
Fees for services provided to joint ventures 89,255 (54,311)
Income taxes (189,226) (191,090)
Inventories (1,486,833) (1,909,253)
Prepaid expenses and other 744,323 (1,317,269)
Accounts payable 682,786 1,641,132
Income tax payable (65,344) 73,546
Accrued liabilities (222,952) 1,720,376
Net cash provided by operating activities 5,477,022 608,687
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from the sale of available for sale securities 3,100,000 1,985,470
Purchase of available for sale securities (3,365,146) (1,518,596)
Purchases of property and equipment (960,339) (680,502)
Investments in patents (114,436) (86,481)
Net cash used in investing activities (1,339,921) (300,109)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividend received by non-controlling interest (400,000) (600,000)
Investment by non-controlling interest 134,034
Dividends paid on NTIC common stock (2,180,244) (1,815,508)
Proceeds from employee stock purchase plan 52,546 27,951
Proceeds from exercise of stock options 15,433
Net cash used in financing activities (2,393,664) (2,372,124)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (49,702) (133,632)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 1,693,735 (2,197,178)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 4,163,023 6,360,201
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 5,856,758 $ 4,163,023