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Per Share Amounts (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income attributable to American Shared Hospital Services	$ 99,000	$ 334,000	$ 505,000	$ 478,000
Weighted average common shares for basic earnings per share	5,947,000	5,554,000	5,745,000	5,553,000
Diluted effect of stock options and restricted stock	94,000	39,000	167,000	11,000
Weighted average common shares for diluted earnings per share	6,041,000	5,593,000	5,912,000	5,564,000
Basic earnings per share	$ 0.02	$ 0.06	$ 0.09	$ 0.09
Diluted earnings per share	$ 0.02	$ 0.06	$ 0.09	$ 0.09

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