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Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 8,031 | $ 8,017 | $ 11,394 | $ 9,245 | $ 6,812 | $ 6,564 | $ 5,996 | $ 5,750 | $ 36,687 | $ 25,122
Operating expenses | (4,522) | (4,672) | (8,922) | (6,459) | (3,865) | (3,645) | (3,090) | (3,146) |  |
Other (expenses) income | (4,593) | 2,675 | (4,324) | (3,104) | (3,162) | (3,166) | (2,651) | (2,431) | (9,346) | (11,410)
Net (loss) income | (1,084) | 6,020 | (1,852) | (318) | (215) | (247) | 255 | 173 | 2,766 | (34)
Net (income) loss attributable to non-controlling interests | 69 | (337) | 110 | 21 | 26 | 26 | (28) | (21) | (137) | 3
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY | (1,015) | 5,683 | (1,742) | (297) | $ (189) | $ (221) | $ 227 | $ 152 | 2,629 | (31)
Dividends declared on Series B cumulative redeemable preferred stock | (286) | (90) | (3) | 0 |  |  |  |  |  | 0
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS | $ (1,301) | $ 5,593 | $ (1,745) | $ (297) |  |  |  |  | $ 2,250 | $ (31)
Earnings (loss) per common share – basic and diluted (in dollars per share) | $ (0.07) | $ 0.35 | $ (0.11) | $ (0.02) | $ (0.01) | $ (0.02) | $ 0.02 | $ 0.01 | $ 0.15 | $ 0.00
Weighted average common shares outstanding - basic and diluted (in shares) | 16,457,600 | 16,057,957 | 15,506,512 | 13,957,732 | 13,666,560 | 12,271,925 | 11,850,624 | 10,395,736 | 15,503,341 | 12,055,791

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