Note 7 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
|
May 31, 2022 |
Aug. 31, 2021 |
| Current assets |
|
$ 38,968,265
|
$ 33,747,089
|
| Total assets |
|
85,185,397
|
74,370,879
|
| Current liabilities |
|
14,241,487
|
8,516,196
|
| Noncurrent liabilities |
|
2,268,240
|
104,102
|
| Joint ventures’ equity |
|
65,222,459
|
62,368,028
|
| Investments in joint ventures |
|
22,194,433
|
27,623,768
|
| EXCOR and All Other Joint Venturs [Member] |
|
|
|
| Investments in joint ventures |
|
22,194,433
|
27,623,768
|
| Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |
|
20,844,284
|
24,702,778
|
| EXCOR [Member] |
|
|
|
| Investments in joint ventures |
|
12,374,756
|
15,412,574
|
| Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |
|
12,343,851
|
14,697,490
|
| All Other [Member] |
|
|
|
| Investments in joint ventures |
|
9,819,677
|
|
| Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |
|
8,500,433
|
|
| Joint Ventures in France [Member] |
|
|
|
| Investments in joint ventures |
[1] |
|
12,211,194
|
| Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings |
[1] |
|
10,005,288
|
| Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |
|
|
|
| Current assets |
|
55,305,950
|
69,394,796
|
| Total assets |
|
59,037,744
|
73,814,402
|
| Current liabilities |
|
13,289,392
|
16,366,398
|
| Noncurrent liabilities |
|
1,223,185
|
1,455,524
|
| Joint ventures’ equity |
|
44,601,335
|
55,992,480
|
| EXCOR [Member] |
|
|
|
| Current assets |
|
25,677,287
|
33,886,655
|
| Total assets |
|
27,727,623
|
36,211,520
|
| Current liabilities |
|
2,978,114
|
5,386,377
|
| Noncurrent liabilities |
|
0
|
0
|
| Joint ventures’ equity |
|
24,749,509
|
30,825,144
|
| All Other [Member] |
|
|
|
| Current assets |
|
29,628,663
|
|
| Total assets |
|
31,310,121
|
|
| Current liabilities |
|
10,311,279
|
|
| Noncurrent liabilities |
|
1,223,185
|
|
| Joint ventures’ equity |
|
$ 19,851,826
|
|
| Joint Ventures in France [Member] |
|
|
|
| Current assets |
[1] |
|
35,508,141
|
| Total assets |
[1] |
|
37,602,882
|
| Current liabilities |
[1] |
|
10,980,021
|
| Noncurrent liabilities |
[1] |
|
1,455,524
|
| Joint ventures’ equity |
[1] |
|
$ 25,167,336
|
|
|