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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)	Nov. 30, 2022	Aug. 31, 2022
Current assets	$ 39,892,066	$ 40,234,881
Total assets	84,122,773	86,193,953
Current liabilities	14,483,146	17,065,401
Noncurrent liabilities	1,766,432	1,884,256
Joint ventures’ equity	64,165,936	63,595,262
Investments in joint ventures	20,331,746	21,814,754
EXCOR and All Other Joint Venturs [Member]
Investments in joint ventures	20,331,746	21,814,754
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	19,303,110	21,256,923
EXCOR [Member]
Investments in joint ventures	11,126,892	12,494,320
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	11,095,987	12,463,415
All Other [Member]
Investments in joint ventures	9,204,854	9,320,434
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings	8,207,123	8,793,508
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Current assets	50,644,203	52,428,831
Total assets	54,232,523	55,854,457
Current liabilities	12,684,139	10,981,833
Noncurrent liabilities	354,984	1,138,980
Joint ventures’ equity	41,193,400	43,733,644
EXCOR [Member]
Current assets	23,082,855	26,047,914
Total assets	25,102,700	27,932,532
Current liabilities	2,848,920	2,943,895
Noncurrent liabilities		0
Joint ventures’ equity	22,253,780	24,988,637
Joint Ventures in France [Member]
Current assets		26,380,917
Total assets		27,921,925
Current liabilities		8,037,938
Noncurrent liabilities		1,138,980
Joint ventures’ equity		$ 18,745,007
All Other [Member]
Current assets	27,561,348
Total assets	29,129,823
Current liabilities	9,835,219
Noncurrent liabilities	354,984
Joint ventures’ equity	$ 18,939,620

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