Document And Entity Information
9 Months Ended
Jan. 31, 2014
Mar. 03, 2014
Document and Entity Information [Abstract]    
Entity Registrant Name ELECSYS CORP  
Document Type 10-Q  
Current Fiscal Year End Date --04-30  
Entity Common Stock, Shares Outstanding   3,817,168
Amendment Flag false  
Entity Central Index Key 0000914398  
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 Jan. 31, 2014  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q3