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DOCUMENT AND ENTITY INFORMATION (USD $)
 12 Months Ended
Dec. 31, 2012
Mar. 01, 2013
Jun. 30, 2012
Entity Registrant Name AMERICAN SHARED HOSPITAL SERVICES    
Entity Central Index Key 0000744825    
Current Fiscal Year End Date --12-31    
Entity Filer Category Smaller Reporting Company    
Trading Symbol ams    
Entity Common Stock Shares Outstanding   4,605,870  
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2012    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2012    
Entity Well-Known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 10,850,000