CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 4,670	$ 5,301	$ 13,229	$ 15,819
Costs of revenue:
Maintenance and supplies	562	648	1,748	1,968
Depreciation and amortization	1,819	1,817	5,103	5,719
Other direct operating costs	1,151	1,023	2,939	2,653
Cost and expenses	3,532	3,488	9,790	10,340
Gross margin	1,138	1,813	3,439	5,479
Selling and administrative expense	1,135	1,065	3,556	3,201
Interest expense	254	302	803	1,015
Operating (loss) income	(251)	446	(920)	1,263
Interest and other income	3	7	7	15
(Loss) income before income taxes	(248)	453	(913)	1,278
Income tax (benefit) expense	(34)	99	(192)	250
Net (loss) income	(214)	354	(721)	1,028
Less: Net loss (income) attributable to non-controlling interest	5	(189)	(106)	(562)
Net (loss) income attributable to American Shared Hospital Services	$ (209)	$ 165	$ (827)	$ 466
Net (loss) income per share:
(Loss) earnings per common share - basic (in USD per share)	$ (0.03)	$ 0.03	$ (0.14)	$ 0.08
(Loss) earnings per common share - diluted (in USD per share)	$ (0.03)	$ 0.03	$ (0.14)	$ 0.08