v3.25.1
Document And Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2025
May 23, 2025
Sep. 27, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2025    
Document Transition Report false    
Entity File Number 0-01989    
Entity Registrant Name Seneca Foods Corporation    
Entity Incorporation, State or Country Code NY    
Entity Tax Identification Number 16-0733425    
Entity Address, Address Line One 350 WillowBrook Office Park    
Entity Address, City or Town Fairport    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 14450    
City Area Code 585    
Local Phone Number 495-4100    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 324,037,648
Auditor Firm ID 34    
Auditor Name Deloitte & Touche LLP    
Auditor Location Rochester, NY    
Entity Central Index Key 0000088948    
Current Fiscal Year End Date --03-31    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Class A [Member]      
Document Information [Line Items]      
Title of 12(b) Security Common Stock Class A, $0.25 Par    
Trading Symbol SENEA    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding (in shares)   5,330,247  
Common Class B [Member]      
Document Information [Line Items]      
Title of 12(b) Security Common Stock Class B, $0.25 Par    
Trading Symbol SENEB    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding (in shares)   1,562,163