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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, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Net sales $ 30,220,550 $ 22,962,599 $ 58,719,261 $ 47,163,046
Gross profit 13,531,276 10,161,509 26,319,398 20,858,536
Net income 3,712,684 2,774,943 7,212,499 5,182,951
Northern Technologies International Corporation’s share of equity in income from joint ventures 1,805,997 1,383,139 3,547,325 2,657,143
EXCOR [Member]        
Net sales 12,204,736 9,076,908 23,231,250 18,285,432
Gross profit 6,557,964 4,867,517 12,491,490 9,761,696
Net income 2,674,777 2,161,408 5,158,577 4,017,746
Northern Technologies International Corporation’s share of equity in income from joint ventures 1,338,671 1,078,272 2,580,571 2,006,441
All Other [Member]        
Net sales 18,015,814 13,885,691 35,488,011 28,877,614
Gross profit 6,973,312 5,293,992 13,827,908 11,096,840
Net income 1,037,907 613,535 2,053,922 1,165,205
Northern Technologies International Corporation’s share of equity in income from joint ventures $ 467,326 $ 304,867 $ 966,754 $ 650,702