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Per Share Amounts (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Net (loss) attributable to American Shared Hospital Services $ (1,970,000) $ (927,000) $ (1,842,000) $ (1,023,000)
Weighted average common shares for basic earnings per share 5,484,000 4,718,000 5,480,000 4,718,000
Diluted effect of stock options and restricted stock 0 0 0 0
Weighted average common shares for diluted earnings per share 5,484,000 4,718,000 5,480,000 4,718,000
Basic (loss) per share $ (0.36) $ (0.2) $ (0.34) $ (0.22)
Diluted (loss) per share $ (0.36) $ (0.2) $ (0.34) $ (0.22)