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Note 6 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($)
 12 Months Ended
Aug. 31, 2020
Aug. 31, 2019
Net sales by segment $ 47,638,691 $ 55,750,137
Gross profit 16,029,417 17,779,893
Net (loss) income attributable to NTIC (1,337,709) 5,209,622
Northern Technologies International Corporation’s share of equity in income of joint ventures 4,270,327 7,225,518
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]    
Net sales by segment 87,030,062 114,635,435
Gross profit 39,532,750 51,312,013
Net (loss) income attributable to NTIC 8,545,473 14,688,999
Northern Technologies International Corporation’s share of equity in income of joint ventures 4,270,327 7,225,518
Northern Technologies International Corporation’s dividends received from joint ventures 5,672,099 5,039,041
EXCOR [Member]    
Net sales by segment 32,546,402 47,015,841
Gross profit 18,739,471 25,622,261
Net (loss) income attributable to NTIC 5,266,541 10,827,448
Northern Technologies International Corporation’s share of equity in income of joint ventures 2,622,423 5,415,362
Northern Technologies International Corporation’s dividends received from joint ventures 4,675,850 3,345,600
Joint Ventures in France [Member]    
Net sales by segment 8,133,294  
Gross profit 3,061,433  
Net (loss) income attributable to NTIC 473,137  
Northern Technologies International Corporation’s share of equity in income of joint ventures 237,490  
Northern Technologies International Corporation’s dividends received from joint ventures  
Joint Ventures in Finland [Member]    
Net sales by segment 3,088,865  
Gross profit 1,916,001  
Net (loss) income attributable to NTIC 419,728  
Northern Technologies International Corporation’s share of equity in income of joint ventures 209,972  
Northern Technologies International Corporation’s dividends received from joint ventures 325,635  
Joint Ventures in India [Member]    
Net sales by segment 5,481,303  
Gross profit 2,498,196  
Net (loss) income attributable to NTIC 697,349  
Northern Technologies International Corporation’s share of equity in income of joint ventures 349,218  
Northern Technologies International Corporation’s dividends received from joint ventures 261,220  
Joint Ventures in Thailand [Member]    
Net sales by segment 6,471,831  
Gross profit 2,046,478  
Net (loss) income attributable to NTIC 503,884  
Northern Technologies International Corporation’s share of equity in income of joint ventures 253,192  
Northern Technologies International Corporation’s dividends received from joint ventures 160,074  
All Other [Member]    
Net sales by segment 31,308,367 67,619,594
Gross profit 11,271,171 25,689,752
Net (loss) income attributable to NTIC 1,184,834 3,861,551
Northern Technologies International Corporation’s share of equity in income of joint ventures 598,032 1,810,156
Northern Technologies International Corporation’s dividends received from joint ventures $ 249,320 $ 1,693,441