XML 56 R1.htm IDEA: XBRL DOCUMENT v2.4.0.6
Document And Entity Information (USD $)
 12 Months Ended
Sep. 30, 2012
Nov. 30, 2012
Mar. 30, 2012
Document and Entity Information [Abstract]      
Entity Registrant Name Bridgeline Digital, Inc.    
Document Type 10-K    
Current Fiscal Year End Date --09-30    
Entity Common Stock, Shares Outstanding   152,210,038  
Entity Public Float     $ 10,175,076
Amendment Flag false    
Entity Central Index Key 0001378590    
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 Sep. 30, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY