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Document And Entity Information - shares
 6 Months Ended
Mar. 31, 2016
May. 03, 2016
Entity Registrant Name Bridgeline Digital, Inc.  
Entity Central Index Key 0001378590  
Trading Symbol blin  
Current Fiscal Year End Date --09-30  
Entity Filer Category Smaller Reporting Company  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Entity Common Stock, Shares Outstanding (in shares)   5,434,306
Document Type 10-Q  
Document Period End Date Mar. 31, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q2  
Amendment Flag false