v3.25.2
Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 11, 2025
Document Information [Line Items]    
Entity Central Index Key 0000744825  
Entity Registrant Name AMERICAN SHARED HOSPITAL SERVICES  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2025  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-08789  
Entity Incorporation, State or Country Code CA  
Entity Tax Identification Number 94-2918118  
Entity Address, Address Line One 601 Montgomery Street  
Entity Address, City or Town San Francisco  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94111-2619  
City Area Code 415  
Local Phone Number 788-5300  
Title of 12(b) Security American Shared Hospital Services Common Stock, No Par Value  
Trading Symbol AMS  
Security Exchange Name NYSE  
Entity Current Reporting Status No  
Entity Interactive Data Current No  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   6,510,000