Note 6 - Per Share Amounts - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Net (loss) income attributable to American Shared Hospital Services	$ (625,000)	$ 119,000
Weighted average common shares for basic (loss) earnings per share (in shares)	6,572,000	6,452,000
Dilutive effect of stock options and restricted stock awards (in shares)	0	124,000
Weighted average common shares for diluted (loss) earnings per share (in shares)	6,572,000	6,576,000
Basic (loss) earnings per share (in dollars per share)	$ (0.1)	$ 0.02
Diluted (loss) earnings per share (in dollars per share)	$ (0.1)	$ 0.02