CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Rental income from medical services	$ 19,556,000	$ 18,700,000	$ 16,548,000
Revenue	19,556,000	18,700,000	16,548,000
Costs of revenue:
Maintenance and supplies	1,359,000	874,000	1,089,000
Depreciation and amortization	6,601,000	6,262,000	6,139,000
Other direct operating costs	2,933,000	2,769,000	2,605,000
Costs of revenue	10,893,000	9,905,000	9,833,000
Gross margin	8,663,000	8,795,000	6,715,000
Selling and administrative expense	4,323,000	3,802,000	3,496,000
Interest expense	1,927,000	1,707,000	1,239,000
Operating income	2,413,000	3,286,000	1,980,000
(Loss) on early extinguishment of debt	0	(108,000)	0
(Loss) on write down investment in equity securities	(579,000)	0	(2,140,000)
Interest and other income	3,000	15,000	18,000
Income before income taxes	1,837,000	3,193,000	(142,000)
Income tax (benefit) expense	(1,103,000)	943,000	434,000
Net income (loss)	2,940,000	2,250,000	(576,000)
Less: net income attributable to non-controlling interests	(1,017,000)	(1,320,000)	(946,000)
Net income (loss) attributable to American Shared Hospital Services	$ 1,923,000	$ 930,000	$ (1,522,000)
Net income (loss) per share attributable to American Shared Hospital Services:
Income (loss) per common share- basic	$ 0.33	$ 0.17	$ (0.28)
Income (loss) per common share- diluted	$ 0.33	$ 0.17	$ (0.28)