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Note 6 - Per Share Amounts - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net (loss) income attributable to American Shared Hospital Services $ (111,000) $ 497,000 $ 77,000 $ 766,000
Weighted average common shares for basic earnings per share (in shares) 6,336,000 6,203,000 6,336,000 6,187,000
Dilutive effect of stock options and restricted stock awards (in shares) 0 78,000 129,000 79,000
Weighted average common shares for diluted earnings per share (in shares) 6,336,000 6,281,000 6,465,000 6,266,000
Basic (loss) earnings per share (in dollars per share) $ (0.02) $ 0.08 $ 0.01 $ 0.12
Diluted (loss) earnings per share (in dollars per share) $ (0.02) $ 0.08 $ 0.01 $ 0.12