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Note 7 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($) | 12 Months Ended
--- | ---
Aug. 31, 2025 | Aug. 31, 2024
Net sales | $ 84,234,474 | $ 85,059,517
Gross profit | 31,676,555 | 33,786,362
Net income | 17,619 | 5,409,082
NTIC’s share of equity in income from joint ventures | 3,539,056 | 4,223,296
EXCOR and All Other Joint Ventures [Member] |  |
Net income | 7,081,482 | 8,450,411
NTIC’s share of equity in income from joint ventures | 3,539,057 | 4,223,296
NTIC’s dividends received from joint ventures | 1,566,946 | 2,997,164
EXCOR [Member] |  |
Net income | 3,325,785 | 4,599,088
NTIC’s share of equity in income from joint ventures | 1,664,532 | 2,299,274
NTIC’s dividends received from joint ventures | 0 | 1,624,950
All Other [Member] |  |
Net income | 1,372,804 | 3,851,323
NTIC’s share of equity in income from joint ventures | 682,436 | 1,924,022
NTIC’s dividends received from joint ventures | 548,805 | 1,372,214
Acobal [Member] |  |
Net income | 1,418,240 |
NTIC’s share of equity in income from joint ventures | 708,333 |
NTIC’s dividends received from joint ventures | 635,528 |
Zerust OY [Member] |  |
Net income | 964,653 |
NTIC’s share of equity in income from joint ventures | 483,754 |
NTIC’s dividends received from joint ventures | 382,613 |
EXCOR and All Other Joint Ventures [Member] |  |
Net sales | 91,236,272 | 95,940,014
Gross profit | 39,460,739 | 41,247,036
EXCOR [Member] |  |
Net sales | 32,909,789 | 35,720,889
Gross profit | 17,637,075 | 18,288,258
All Other [Member] |  |
Net sales | 41,774,073 | 60,219,125
Gross profit | 14,346,567 | $ 22,958,778
Acobal [Member] |  |
Net sales | 11,721,152 |
Gross profit | 4,500,635 |
Zerust OY [Member] |  |
Net sales | 4,831,258 |
Gross profit | $ 2,976,462 |

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