v3.26.1
Note 7 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($)
 3 Months Ended 9 Months Ended
May 31, 2026
May 31, 2025
May 31, 2026
May 31, 2025
Net sales $ 24,215,662 $ 21,508,563 $ 69,521,265 $ 61,919,022
Net sales 24,215,662 21,508,563 69,521,265 61,919,022
Gross profit 8,143,164 8,259,440 24,384,676 23,217,977
Net income (263,291) 121,775 (60,795) 1,117,185
Gross profit 8,143,164 8,259,440 24,384,676 23,217,977
Equity in income from joint ventures 1,517,174 970,314 3,839,960 2,720,637
Net income (263,291) 121,775 (60,795) 1,117,185
NTIC’s share of equity in income from joint ventures 1,517,174 970,314 3,839,960 2,720,637
EXCOR and All Other Joint Ventures [Member]        
Net income   1,937,620   5,416,777
Equity in income from joint ventures   970,314   2,720,637
NTIC’s dividends received from joint ventures   886,209 1,786,116 1,566,946
Net income   1,937,620   5,416,777
NTIC’s share of equity in income from joint ventures   970,314   2,720,637
NTIC’s dividends received from joint ventures   886,209 1,786,116 1,566,946
EXCOR [Member]        
Net income 1,416,371 897,104 3,363,103 2,665,391
Equity in income from joint ventures 710,699 448,673 1,681,054 1,340,674
NTIC’s dividends received from joint ventures 0 0 0 0
Net income 1,416,371 897,104 3,363,103 2,665,391
NTIC’s share of equity in income from joint ventures 710,699 448,673 1,681,054 1,340,674
NTIC’s dividends received from joint ventures 0 0 0 0
All Other [Member]        
Net income 301,396 1,040,516 880,993 2,751,386
Equity in income from joint ventures 151,329 521,641 440,725 1,379,963
NTIC’s dividends received from joint ventures 218,762 886,209 228,763 1,566,946
Net income 301,396 1,040,516 880,993 2,751,386
NTIC’s share of equity in income from joint ventures 151,329 521,641 440,725 1,379,963
NTIC’s dividends received from joint ventures 218,762 886,209 228,763 1,566,946
EXCOR and All Other Joint Venturs [Member]        
Net income 3,019,996   7,680,459  
Equity in income from joint ventures 1,517,175   3,839,960  
NTIC’s dividends received from joint ventures 383,601      
Net income 3,019,996   7,680,459  
NTIC’s share of equity in income from joint ventures 1,517,175   3,839,960  
NTIC’s dividends received from joint ventures 383,601      
Acobal [Member]        
Net income 686,418   1,917,029  
Equity in income from joint ventures 344,885   958,506  
NTIC’s dividends received from joint ventures 0   747,467  
Net income 686,418   1,917,029  
NTIC’s share of equity in income from joint ventures 344,885   958,506  
NTIC’s dividends received from joint ventures 0   747,467  
Zerust OY [Member]        
Net income 300,889   808,425  
Equity in income from joint ventures 151,128   404,069  
NTIC’s dividends received from joint ventures 0   436,716  
Net income 300,889   808,425  
NTIC’s share of equity in income from joint ventures 151,128   404,069  
NTIC’s dividends received from joint ventures 0   436,716  
Zerust AB [Member]        
Net income 191,352   313,037  
Equity in income from joint ventures 96,327   156,628  
NTIC’s dividends received from joint ventures 0   208,331  
Net income 191,352   313,037  
NTIC’s share of equity in income from joint ventures 96,327   156,628  
NTIC’s dividends received from joint ventures 0   208,331  
Spec Tech [Member]        
Net income 123,570   397,872  
Equity in income from joint ventures 62,807   198,978  
NTIC’s dividends received from joint ventures 164,839   164,839  
Net income 123,570   397,872  
NTIC’s share of equity in income from joint ventures 62,807   198,978  
NTIC’s dividends received from joint ventures 164,839   164,839  
EXCOR and All Other Joint Venturs [Member]        
Net sales 26,707,572   74,722,581  
Net sales 26,707,572   74,722,581  
Gross profit 11,384,037   32,468,425  
Gross profit 11,384,037   32,468,425  
EXCOR and All Other Joint Ventures [Member]        
Net sales   23,211,613   66,848,498
Net sales   23,211,613   66,848,498
Gross profit   9,768,978   28,325,377
Gross profit   9,768,978   28,325,377
EXCOR [Member]        
Net sales 9,480,910 8,271,661 26,583,069 23,914,520
Net sales 9,480,910 8,271,661 26,583,069 23,914,520
Gross profit 4,910,642 4,339,777 14,048,988 12,695,626
Gross profit 4,910,642 4,339,777 14,048,988 12,695,626
Acobal [Member]        
Net sales 3,691,757   10,549,682  
Net sales 3,691,757   10,549,682  
Gross profit 1,429,663   4,141,657  
Gross profit 1,429,663   4,141,657  
All Other [Member]        
Net sales 8,189,940 14,939,952 22,703,497 42,933,978
Net sales 8,189,940 14,939,952 22,703,497 42,933,978
Gross profit 2,947,175 5,429,201 8,432,954 15,629,751
Gross profit 2,947,175 $ 5,429,201 8,432,954 $ 15,629,751
Zerust OY [Member]        
Net sales 1,438,124   4,168,396  
Net sales 1,438,124   4,168,396  
Gross profit 878,449   2,545,287  
Gross profit 878,449   2,545,287  
Zerust AB [Member]        
Net sales 1,627,801   4,053,901  
Net sales 1,627,801   4,053,901  
Gross profit 608,218   1,476,905  
Gross profit 608,218   1,476,905  
Spec Tech [Member]        
Net sales 2,279,040   6,664,036  
Net sales 2,279,040   6,664,036  
Gross profit 609,890   1,822,634  
Gross profit $ 609,890   $ 1,822,634