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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		6 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Net sales	$ 27,749,880	$ 30,220,550	$ 58,229,806	$ 58,719,261
Gross profit	12,632,547	13,531,276	25,989,438	26,319,398
Net income	3,450,976	3,712,684	7,614,767	7,212,499
Northern Technologies International Corporation’s share of equity in income from joint ventures	1,715,216	1,805,997	3,719,378	3,547,325
EXCOR [Member]
Net sales	11,092,133	12,204,736	23,961,656	23,231,250
Gross profit	6,306,084	6,557,964	12,989,658	12,491,490
Net income	2,440,323	2,674,777	5,480,125	5,158,577
Northern Technologies International Corporation’s share of equity in income from joint ventures	1,221,006	1,338,671	2,740,907	2,580,571
All Other [Member]
Net sales	16,657,747	18,015,814	34,268,150	35,488,011
Gross profit	6,326,463	6,973,312	12,999,780	13,827,908
Net income	1,010,653	1,037,907	2,134,642	2,053,922
Northern Technologies International Corporation’s share of equity in income from joint ventures	$ 494,210	$ 467,326	$ 978,471	$ 966,754

X

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The amount of gross profit (loss) reported by an equity method investment of the entity.

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