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Per Share Amounts (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income (loss) attributable to American Shared Hospital Services	$ 334,000	$ 43,000	$ 478,000	$ (1,799,000)
Weighted average common shares for basic earnings per share	5,554,000	5,494,000	5,553,000	5,485,000
Diluted effect of stock options, restricted stock & common stock warrants	39,000	22,000	11,000	0
Weighted average common shares for diluted earnings per share	5,593,000	5,516,000	5,564,000	5,485,000
Basic earnings (loss) per share	$ 0.06	$ 0.01	$ 0.09	$ (0.33)
Diluted earnings (loss) per share	$ 0.06	$ 0.01	$ 0.09	$ (0.33)

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