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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Aug. 31, 2023
Aug. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:    
NET INCOME $ 4,237,731 $ 7,185,934
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 1,337,734 931,532
Depreciation expense 1,042,505 938,489
Amortization expense 588,454 629,843
Loss on disposal of property and equipment 8,534 (0)
Remeasurement gain on acquisition of equity method investee 0 (3,951,550)
Change in allowance for doubtful accounts 94,000 57,000
Equity in income from joint ventures (6,452,719) (4,725,918)
Dividends received from joint ventures 5,639,198 5,723,176
Deferred income taxes (395,001) (81,500)
Changes in current assets and liabilities:    
Trade, excluding joint ventures (1,956,234) (2,091,353)
Trade, joint ventures 509,949 (73,053)
Fees for services provided to joint ventures 468,523 (259,550)
Dividends receivable from joint venture (1,986,027) 0
Income taxes (34,202) 284,025
Inventories 3,030,665 (4,818,860)
Prepaid expenses and other (3,061) 3,111
Accounts payable (1,509,226) 3,010,526
Income tax payable (16,077) (493,091)
Accrued liabilities 953,541 (1,122,683)
Net cash provided by operating activities 5,541,219 1,146,078
CASH FLOWS FROM INVESTING ACTIVITIES:    
Acquisition of Zerust India business, net of cash acquired 0 (5,062,003)
Proceeds from the sale of available for sale securities 5,590 (956)
Investment in joint venture 0 (341,392)
Purchases of property and equipment (3,247,652) (1,496,674)
Proceeds from sale of property and equipment 13,000 0
Investments in patents (114,062) (207,149)
Net cash used in investing activities (3,343,124) (7,108,174)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Dividend received by non-controlling interest (655,574) (402,729)
Repayments on the line of credit (2,300,000) 0
Proceeds from line of credit 0 5,900,000
Proceeds from term loan 2,812,504 0
Dividends paid on NTIC common stock (2,624,462) (2,581,179)
Proceeds from employee stock purchase plan 75,464 73,645
Proceeds from exercise of stock options 638,270 198,640
Net cash (used in) provided by financing activities (2,053,798) 3,188,377
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (72,014) 426,968
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 72,283 (2,346,751)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 5,333,890 7,680,641
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 5,406,173 $ 5,333,890