Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 12, 2021	Jun. 30, 2020
Document and Entity Information [Abstract]
Document Type	10-K
Entity Central Index Key	0000095029
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Document Annual Report	true
Document Transition Report	false
Entity File Number	0-4776
Entity Registrant Name	STURM, RUGER & COMPANY, INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	06-0633559
Entity Address, Address Line One	1 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
Title of 12(b) Security	Common Stock, $1 par value
Trading Symbol	RGR
Name of Exchange on which Security is Registered	NYSE
Entity Well-Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Interactive Data Current	Yes
Auditor Attestation Flag	true
Entity Public Float			$ 1,313,936,500
Entity Common Stock, Shares Outstanding		17,545,000
Documents Incorporated By Reference Text Block	Portions of the registrant’s Proxy Statement relating to the 2021 Annual Meeting of Stockholders to be held May 12, 2021 are incorporated by reference into Part III (Items 10 through 14) of this Report.