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Document And Entity Information
 3 Months Ended
Nov. 30, 2014
Jan. 05, 2015
Document and Entity Information [Abstract]    
Entity Registrant Name Northern Technologies International Corporation  
Document Type 10-Q  
Current Fiscal Year End Date --08-31  
Entity Common Stock, Shares Outstanding   4,521,883dei_EntityCommonStockSharesOutstanding
Amendment Flag false  
Entity Central Index Key 0000875582  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Smaller Reporting Company  
Entity Well-known Seasoned Issuer No  
Document Period End Date Nov. 30, 2014  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1