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Summary of Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator:        
Income from continuing operations $ 3,695 $ 2,965 $ 9,395 $ 7,387
Less: Income allocated to unvested participating securities 63 51 160 126
Income from continuing operations available to common stockholders 3,632 2,914 9,235 7,261
Income from discontinued operations 0 30,451 0 32,501
Less: Income allocated to unvested participating securities 0 520 0 556
Income from discontinued operations available to common stockholders 0 29,931 0 31,945
Net income available to common stockholders $ 3,632 $ 32,845 $ 9,235 $ 39,206
Denominator:        
Denominator for basic earnings per share— weighted average shares 5,822 5,807 5,833 5,800
Effect of dilutive securities:        
Common stock equivalents 0 0 0 4
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions 5,822 5,807 5,833 5,804
Basic earnings per share:        
From continuing operations $ 0.62 $ 0.50 $ 1.58 $ 1.25
From discontinued operations 0 5.16 0 5.51
Basic earnings per share 0.62 5.66 1.58 6.76
Diluted earnings per share        
From continuing operations 0.62 0.50 1.58 1.25
From discontinued operations 0 5.16 0 5.51
Diluted earnings per share $ 0.62 $ 5.66 $ 1.58 $ 6.76