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Per Share Amounts (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income attributable to American Shared Hospital Services	$ 287,000	$ 113,000	$ 677,000	$ 406,000
Weighted average common shares for basic earnings per share	5,834,000	5,935,000	5,826,000	5,725,000
Diluted effect of stock options and restricted stock	28,000	208,000	29,000	196,000
Weighted average common shares for diluted earnings per share	5,862,000	6,143,000	5,855,000	5,921,000
Basic earnings per share	$ 0.05	$ 0.02	$ 0.12	$ 0.07
Diluted earnings per share	$ 0.05	$ 0.02	$ 0.12	$ 0.07

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