Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Mar. 12, 2024	Jun. 30, 2023
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	000-16335
Entity Registrant Name	RIDGEFIELD ACQUISITION CORP
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	84-0922701
Entity Address, Address Line One	3827 S Carson St, Unit 505-25
Entity Address, Address Line Two	PMB 1078
Entity Address, City or Town	Carson City
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89701
City Area Code	805
Local Phone Number	484-8855
Title of 12(g) Security	Common Stock, $0.001 par value
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	true
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Public Float				$ 29,682
Entity Common Stock, Shares Outstanding			2,860,773
Entity Central Index Key	0000812152
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false
Trading Symbol	RDGA
Auditor Name	LMHS, P.C.	MaloneBailey, LLP
Auditor Firm ID	3373	206
Auditor Location	Norwell, Massachusetts	Houston, Texas