Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Mar. 01, 2014	Jun. 30, 2013
Document Information [Line Items]
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		4,608,870
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2013
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2013
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 7,342,000