v3.26.1
Document And Entity Information
 12 Months Ended
Dec. 31, 2025
USD ($)
shares
Document Information [Line Items]  
Document Type 10-K
Document Annual Report true
Document Period End Date Dec. 31, 2025
Document Transition Report false
Entity File Number 0-12346
Entity Registrant Name IRONSTONE PROPERTIES, INC.
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 95-2829956
Entity Address, Address Line One 40 Mesa Street, Suite 105
Entity Address, City or Town San Francisco
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94129
City Area Code 415
Local Phone Number 340-4766
Title of 12(g) Security Common Stock, $0.01 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
ICFR Auditor Attestation Flag false
Document Financial Statement Error Correction [Flag] false
Entity Shell Company false
Entity Public Float | $ $ 507,872
Entity Common Stock, Shares Outstanding (in shares) | shares 3,472,491
Auditor Name N/A
Auditor Location N/A
Auditor Firm ID 9999
Entity Central Index Key 0000723269
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Amendment Flag false