| Document And Entity Information | Jan. 18, 2022 |
| Document Information [Line Items] | |
| Entity, Registrant Name | BIOSYNERGY, INC. |
| Document, Type | 8-K |
| Document, Period End Date | Jan. 18, 2022 |
| Entity, Incorporation, State or Country Code | IL |
| Entity, File Number | 0-12459 |
| Entity, Tax Identification Number | 36-2880990 |
| Entity, Address, Address Line One | 1940 E. Devon |
| Entity, Address, City or Town | Elk Grove Village |
| Entity, Address, State or Province | IL |
| Entity, Address, Postal Zip Code | 60007 |
| City Area Code | 847 |
| Local Phone Number | 956-0471 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0000715812 |
