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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue: |  |  |
Medical services | $ 18,700,000 | $ 16,548,000 | $ 15,417,000
Revenue | 18,700,000 | 16,548,000 | 15,417,000
Costs of revenue: |  |  |
Maintenance and supplies | 874,000 | 1,089,000 | 1,691,000
Depreciation and amortization | 6,262,000 | 6,139,000 | 6,171,000
Other direct operating costs | 2,769,000 | 2,605,000 | 2,276,000
Costs of revenue | 9,905,000 | 9,833,000 | 10,138,000
Gross margin | 8,795,000 | 6,715,000 | 5,279,000
Selling and administrative expense | 3,802,000 | 3,496,000 | 3,630,000
Interest expense | 1,707,000 | 1,239,000 | 1,699,000
Operating income (loss) | 3,286,000 | 1,980,000 | (50,000)
(Loss) on early extinguishment of debt | (108,000) | 0 | 0
(Loss) on write down investment in equity securities | 0 | (2,140,000) | 0
(Loss) on sale of subsidiary | 0 | 0 | (572,000)
Gain on foreign currency transactions | 0 | 0 | 161,000
Interest and other income | 15,000 | 18,000 | 28,000
Income (loss) before income taxes | 3,193,000 | (142,000) | (433,000)
Income tax expense | 943,000 | 434,000 | 129,000
Net income (loss) | 2,250,000 | (576,000) | (562,000)
Less: net income attributable to non-controlling interests | (1,320,000) | (946,000) | (390,000)
Net income (loss) attributable to American Shared Hospital Services | $ 930,000 | $ (1,522,000) | $ (952,000)
Net income (loss) per share attributable to American Shared Hospital Services: |  |  |
Income (loss) per common share- basic | $ 0.17 | $ (0.28) | $ (0.19)
Income (loss) per common share- diluted | $ 0.17 | $ (0.28) | $ (0.19)

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