| Cover | Jul. 31, 2019 | Jul. 31, 2019 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Amendment Flag | false | |
| Document Period End Date | Jul. 31, 2019 | |
| 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 Lacy 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 |
