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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		9 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Gross profit			$ 32,376,247	$ 29,745,795
Net income			8,562,834	7,188,274
Northern Technologies International Corporation’s share of equity in income of joint ventures	$ 1,686,016	$ 1,664,464	4,343,159	3,600,884
Northern Technologies International Corporation's dividends received from joint ventures			5,179,786	5,449,543
Net sales			73,098,215	66,223,514
EXCOR [Member]
Gross profit			15,032,724	13,512,404
Net income			6,184,181	5,409,407
Northern Technologies International Corporation’s share of equity in income of joint ventures			3,089,935	2,714,905
Northern Technologies International Corporation's dividends received from joint ventures			4,240,400	4,364,700
Net sales			28,169,978	25,314,260
Joint Venture in India [Member]
Gross profit			2,463,138	2,427,574
Net income			611,143	697,977
Northern Technologies International Corporation’s share of equity in income of joint ventures			384,712	327,846
Northern Technologies International Corporation's dividends received from joint ventures			446,939	326,023
Net sales			5,299,600	5,027,226
Joint Venture in Finland [Member]
Gross profit			1,569,152	1,438,756
Net income			413,044	342,544
Northern Technologies International Corporation’s share of equity in income of joint ventures			206,874	171,662
Northern Technologies International Corporation's dividends received from joint ventures			200,768	206,516
Net sales			2,619,843	2,435,861
All Other [Member]
Gross profit			13,311,233	12,367,061
Net income			1,354,466	738,346
Northern Technologies International Corporation’s share of equity in income of joint ventures			661,638	386,471
Northern Technologies International Corporation's dividends received from joint ventures			291,679	552,304
Net sales			$ 37,008,794	$ 33,446,167

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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