CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenues	$ 4,364	$ 4,568
Costs of revenue:
Maintenance and supplies	672	633
Depreciation and amortization	1,198	1,647
Other direct operating costs	1,060	894
Costs of revenue	2,930	3,174
Gross margin	1,434	1,394
Selling and administrative expense	1,084	1,211
Interest expense	260	282
Operating income (loss)	90	(99)
Interest and other income	3	3
Income (loss) before income taxes	93	(96)
Income tax expense (benefit)	6	(28)
Net income (loss)	87	(68)
Less: Net (income) attributable to non-controlling interest	(58)	(67)
Net income (loss) attributable to American Shared Hospital Services	$ 29	$ (135)
Net income (loss) per share:
Earnings (loss) per common share - basic (in USD per share)	$ 0.00	$ (0.02)
Earnings (loss) per common share - diluted (in USD per share)	$ 0.00	$ (0.02)