| Cover | Sep. 30, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 30, 2020 |
| Entity File Number | 001-10435 |
| Entity Registrant Name | STURM, RUGER & COMPANY, INC. |
| Entity Central Index Key | 0000095029 |
| Entity Tax Identification Number | 06-0633559 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | One Lacey Place |
| Entity Address, City or Town | Southport |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06890 |
| City Area Code | (203) |
| Local Phone Number | 259-7843 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | RGR |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
