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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)

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