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Note 6 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($) | 12 Months Ended
--- | ---
Aug. 31, 2024 | Aug. 31, 2023
Net sales | $ 85,059,517 | $ 79,902,952
Gross profit | 33,786,362 | 27,803,831
Net income | 5,409,082 | 2,912,276
NTIC’s share of equity in income of joint ventures | 4,223,296 | 6,452,719
EXCOR and All Other Joint Ventures [Member] |  |
Net income | 8,450,411 | 8,934,198
NTIC’s share of equity in income of joint ventures | 4,223,296 | 6,452,719
NTIC’s dividends received from joint ventures | 2,997,164 | 5,639,198
EXCOR [Member] |  |
Net income | 4,599,088 | 5,730,311
NTIC’s share of equity in income of joint ventures | 2,299,274 | 2,852,229
NTIC’s dividends received from joint ventures | 1,624,950 | 2,459,500
All Other [Member] |  |
Net income | 3,851,323 | 3,203,887
NTIC’s share of equity in income of joint ventures | 1,924,022 | 3,600,490
NTIC’s dividends received from joint ventures | 1,372,214 | 3,179,698
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |
Net sales | 95,940,014 | 100,682,316
Gross profit | 41,247,036 | 40,096,561
EXCOR [Member] |  |
Net sales | 35,720,889 | 39,642,380
Gross profit | 18,288,258 | 19,016,389
All Other [Member] |  |
Net sales | 60,219,125 | 61,039,936
Gross profit | $ 22,958,778 | $ 21,080,172

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