v3.3.1.900
Document And Entity Information - shares
3 Months Ended
Nov. 30, 2015
Jan. 10, 2016
Entity Registrant Name Northern Technologies International Corporation  
Entity Central Index Key 0000875582  
Trading Symbol ntic  
Current Fiscal Year End Date --08-31  
Entity Filer Category Accelerated Filer  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Entity Common Stock, Shares Outstanding (in shares)   4,538,317
Document Type 10-Q  
Document Period End Date Nov. 30, 2015  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q1  
Amendment Flag false