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Note 6 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($)	3 Months Ended
	Nov. 30, 2019	Nov. 30, 2018
Net sales	$ 25,460,294	$ 30,479,926
Gross profit	11,357,134	13,356,891
Net income	2,587,980	4,163,791
Northern Technologies International Corporation’s share of equity in income from joint ventures	1,293,991	2,004,162
Northern Technologies International Corporation's dividends received from joint ventures	205,431	1,486,705
EXCOR [Member]
Net sales	9,368,239	12,869,523
Gross profit	5,325,488	6,683,574
Net income	1,642,327	3,039,802
Northern Technologies International Corporation’s share of equity in income from joint ventures	821,164	1,519,901
Northern Technologies International Corporation's dividends received from joint ventures		843,750
All Other [Member]
Net sales	16,092,055	17,610,403
Gross profit	6,031,646	6,673,317
Net income	945,653	1,123,989
Northern Technologies International Corporation’s share of equity in income from joint ventures	472,827	484,261
Northern Technologies International Corporation's dividends received from joint ventures	$ 205,431	$ 642,955

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