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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, 2016
Nov. 30, 2015
Net sales $ 24,200,447 $ 21,871,209
Gross profit 10,697,027 9,648,081
Net income 2,408,008 1,961,922
Northern Technologies International Corporation’s share of equity in income of joint ventures 1,274,004 983,753
EXCOR [Member]    
Net sales 9,208,524 8,207,696
Gross profit 4,894,179 4,153,477
Net income 1,856,338 1,536,247
Northern Technologies International Corporation’s share of equity in income of joint ventures 928,169 768,123
Joint Venture in India [Member]    
Net sales 1,614,470 1,469,977
Gross profit 750,118 693,340
Net income 49,061 85,741
Northern Technologies International Corporation’s share of equity in income of joint ventures 99,163 42,870
Joint Venture in Finland [Member]    
Net sales 929,868 870,971
Gross profit 556,221 520,124
Net income 144,302 113,300
Northern Technologies International Corporation’s share of equity in income of joint ventures 72,151 56,650
All Other [Member]    
Net sales 12,447,585 11,322,565
Gross profit 4,496,509 4,281,140
Net income 358,307 226,634
Northern Technologies International Corporation’s share of equity in income of joint ventures $ 174,521 $ 116,110