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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, 2018	Nov. 30, 2017
Net sales	$ 30,479,926	$ 28,498,711
Gross profit	13,356,891	12,788,122
Net income	4,163,791	3,499,815
Northern Technologies International Corporation’s share of equity in income from joint ventures	2,004,162	1,741,328
Northern Technologies International Corporation's dividends received from joint ventures	1,486,705	63,937
EXCOR [Member]
Net sales	12,869,523	11,026,514
Gross profit	6,683,574	5,933,526
Net income	3,039,802	2,483,800
Northern Technologies International Corporation’s share of equity in income from joint ventures	1,519,901	1,241,900
Northern Technologies International Corporation's dividends received from joint ventures	843,750
All Other [Member]
Net sales	17,610,403	17,472,197
Gross profit	6,673,317	6,854,596
Net income	1,123,989	1,016,015
Northern Technologies International Corporation’s share of equity in income from joint ventures	484,261	499,428
Northern Technologies International Corporation's dividends received from joint ventures	$ 642,955	$ 63,937

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