XML 31 R1.htm IDEA: XBRL DOCUMENT v2.4.0.6
Document and Entity Information
 3 Months Ended
Jun. 30, 2012
Jul. 20, 2012
Common Class A Member
Jul. 20, 2012
Common Class B Member
Document And Entity Information [Abstract]      
Document Type 10-Q    
Document period end date Jun. 30, 2012    
Amendment flag false    
Document Period Focus Q1    
Document Fiscal Year Focus 2013    
Current fiscal year end date --03-31    
Entity central index key 0000088948    
Entity current reporting status Yes    
Entity filer category Accelerated Filer    
Entity registrant name SENECA FOODS CORP /NY/    
Entity voluntary filers No    
Entity well known seasoned issuer No    
Class Of Stock [Line Items]      
Entity common stock shares outstanding   9,594,533 2,120,712