Document and Entity Information	9 Months Ended
	Jan. 31, 2020 shares
Document And Entity Information
Entity Registrant Name	BIOSYNERGY INC
Entity Central Index Key	0000715812
Document Type	10-Q
Document Period End Date	Jan. 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--01-31
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	14,935,511
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2020
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Interactive Data Current	Yes
Entity Incorportation State Country Code	IL
Entity File Number	000-12459
EntityShellCompany	false