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Per Share Amounts (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income attributable to American Shared Hospital Services	$ 293,000	$ 51,000
Weighted average common shares for basic earnings per share	5,685,000	5,541,000
Diluted effect of stock options and restricted stock	199,000	0
Weighted average common shares for diluted earnings per share	5,884,000	5,541,000
Basic earnings per share	$ 0.05	$ 0.01
Diluted earnings per share	$ 0.05	$ 0.01

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