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Note 6 - Per Share Amounts - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net income (loss) attributable to American Shared Hospital Services $ 33,000 $ (209,000) $ (25,000) $ (827,000)
Weighted average common shares for basic earnings per share (in shares) 6,103,000 6,049,000 5,824,000 6,060,000
Diluted effect of stock options and restricted stock awards (in shares) 20,000 0 0 0
Weighted average common shares for diluted earnings per share (in shares) 6,123,000 6,049,000 5,824,000 6,060,000
Basic earnings (loss) per share (in dollars per share) $ 0.01 $ (0.03) $ (0.00) $ (0.14)
Diluted earnings (loss) per share (in dollars per share) $ 0.01 $ (0.03) $ (0.00) $ (0.14)