XML 55 R1.htm IDEA: XBRL DOCUMENT v2.4.1.9
Document And Entity Information
 6 Months Ended
Feb. 28, 2015
Apr. 10, 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   4,523,160dei_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 Feb. 28, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2