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Per Share Amounts (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income (loss) attributable to American Shared Hospital Services	$ 93,000	$ (1,970,000)	$ 144,000	$ (1,842,000)
Weighted average common shares for basic earnings per share	5,552,000	5,484,000	5,548,000	5,480,000
Diluted effect of stock options and restricted stock	16,000	0	16,000	0
Weighted average common shares for diluted earnings per share	5,568,000	5,484,000	5,564,000	5,480,000
Basic earnings (loss) per share	$ 0.02	$ (0.36)	$ 0.03	$ (0.34)
Diluted earnings (loss) per share	$ 0.02	$ (0.36)	$ 0.03	$ (0.34)

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