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Unaudited Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 | 7,287,500 |  |  |
Balance at Dec. 31, 2017 | $ 73 | $ 6,987 | $ 62,115 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  |  | 12,728 | $ 12,728
Stock-based compensation expense |  | 0 |  |
Cash distributions declared ($0.60 per share) |  |  | (4,350) |
Balance (in shares) at Jun. 30, 2018 | 7,287,500 |  |  |
Balance at Jun. 30, 2018 | $ 73 | 6,987 | 70,493 | 77,553
Balance (in shares) at Mar. 31, 2018 | 7,287,500 |  |  |
Balance at Mar. 31, 2018 | $ 73 | 6,987 | 68,464 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  |  | 6,379 | 6,379
Stock-based compensation expense |  | 0 |  |
Cash distributions declared ($0.60 per share) |  |  | (4,350) |
Balance (in shares) at Jun. 30, 2018 | 7,287,500 |  |  |
Balance at Jun. 30, 2018 | $ 73 | 6,987 | 70,493 | 77,553
Balance (in shares) at Dec. 31, 2018 | 10,187,500 |  |  |
Balance at Dec. 31, 2018 | $ 102 | 80,275 | 8,089 | 88,466
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  |  | 10,242 | 10,242
Stock-based compensation expense |  | 329 |  |
Cash distributions declared ($0.60 per share) |  |  | 0 |
Balance (in shares) at Jun. 30, 2019 | 10,187,500 |  |  |
Balance at Jun. 30, 2019 | $ 102 | 80,604 | 18,331 | 99,037
Balance (in shares) at Mar. 31, 2019 | 10,187,500 |  |  |
Balance at Mar. 31, 2019 | $ 102 | 80,446 | 13,205 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  |  | 5,126 | 5,126
Stock-based compensation expense |  | 158 |  |
Cash distributions declared ($0.60 per share) |  |  | 0 |
Balance (in shares) at Jun. 30, 2019 | 10,187,500 |  |  |
Balance at Jun. 30, 2019 | $ 102 | $ 80,604 | $ 18,331 | $ 99,037

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