| Cover | Sep. 03, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 3, 2021 |
| Entity File Number | 000-07092 |
| Entity Registrant Name | Reliability Incorporated |
| Entity Central Index Key | 0000034285 |
| Entity Tax Identification Number | 75-0868913 |
| Entity Incorporation, State or Country Code | TX |
| Entity Address, Address Line One | 2505 Gateway Center Drive |
| Entity Address, Address Line Two | P.O. Box 71 |
| Entity Address, City or Town | Clarksburg |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 20871 |
| City Area Code | (202) |
| Local Phone Number | 965-1100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, no par value |
| Trading Symbol | RLBY |
| Entity Emerging Growth Company | false |
