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Note 7 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($) | May 31, 2025 | Aug. 31, 2024
--- | --- | ---
Current assets | $ 42,600,386 | $ 41,579,219
Total assets | 99,303,381 | 94,676,502
Current liabilities | 20,938,671 | 17,896,943
Non-current liabilities | 1,788,215 | 1,604,238
Joint ventures’ equity | 72,355,000 | 71,193,991
Investments in joint ventures | 27,139,197 | 25,397,287
EXCOR and All Other Joint Venturs [Member] |  |
Investments in joint ventures | 27,139,197 | 25,397,287
NTIC’s share of joint ventures’ undistributed earnings | 24,096,958 | 23,645,685
EXCOR [Member] |  |
Investments in joint ventures | 16,441,653 | 14,645,783
NTIC’s share of joint ventures’ undistributed earnings | 14,613,903 | 14,614,878
All Other [Member] |  |
Investments in joint ventures | 10,697,544 | 10,751,504
NTIC’s share of joint ventures’ undistributed earnings | 9,483,055 | 9,030,807
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |
Current assets | 57,530,046 | 56,420,503
Total assets | 67,124,813 | 64,183,071
Current liabilities | 12,049,553 | 12,553,716
Non-current liabilities | 285,249 | 323,199
Joint ventures’ equity | 54,790,011 | 51,306,156
EXCOR [Member] |  |
Current assets | 27,868,655 | 26,234,664
Total assets | 34,923,270 | 31,513,288
Current liabilities | 2,039,968 | 2,221,726
Non-current liabilities | 0 | 0
Joint ventures’ equity | 32,883,302 | 29,291,562
Joint Ventures in France [Member] |  |
Current assets |  | 30,185,839
Total assets |  | 32,669,783
Current liabilities |  | 10,331,990
Non-current liabilities |  | 323,199
Joint ventures’ equity |  | $ 22,014,594
All Other [Member] |  |
Current assets | 29,661,391 |
Total assets | 32,201,543 |
Current liabilities | 10,009,585 |
Non-current liabilities | 285,249 |
Joint ventures’ equity | $ 21,906,709 |

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