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Note 7 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($)
 12 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Net sales by segment $ 74,158,890 $ 56,493,819
Gross profit 23,068,592 19,573,005
Net income attributable to NTIC 6,324,700 6,281,238
Northern Technologies International Corporation’s share of equity in income of joint ventures 4,725,918 7,465,214
EXCOR and All Other Joint Venturs [Member]    
Northern Technologies International Corporation’s share of equity in income of joint ventures 4,725,918 7,465,214
Northern Technologies International Corporation’s dividends received from joint ventures 5,723,176 3,665,365
EXCOR [Member]    
Northern Technologies International Corporation’s share of equity in income of joint ventures 3,236,989 4,400,403
Northern Technologies International Corporation’s dividends received from joint ventures 4,255,200 1,809,900
All Other [Member]    
Northern Technologies International Corporation’s share of equity in income of joint ventures 1,488,929  
Northern Technologies International Corporation’s dividends received from joint ventures 1,467,976  
Joint Ventures in France [Member]    
Northern Technologies International Corporation’s share of equity in income of joint ventures   3,064,811
Northern Technologies International Corporation’s dividends received from joint ventures [1]   1,855,465
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]    
Net sales by segment 104,077,748 120,954,550
Gross profit 41,030,647 53,371,610
Net income attributable to NTIC 9,302,237 14,921,531
EXCOR [Member]    
Net sales by segment 42,853,162 46,522,688
Gross profit 20,312,400 25,389,981
Net income attributable to NTIC 6,487,855 8,798,995
All Other [Member]    
Net sales by segment 61,224,586  
Gross profit 20,718,247  
Net income attributable to NTIC $ 2,814,382  
Joint Ventures in France [Member]    
Net sales by segment [1]   74,431,862
Gross profit [1]   27,981,629
Net income attributable to NTIC [1]   $ 6,122,536
[1] Includes Zerust India since Zerust India was not a consolidated subsidiary of the Company as of August 31, 2021 or May 31, 2021. See Note 3 entitled “Business Combination.”