Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Income from continuing operations	$ 4,171	$ 3,375	$ 5,700	$ 4,422
Less: Income allocated to unvested participating securities	71	59	97	78
Income from continuing operations available to common stockholders	4,100	3,316	5,603	4,344
Income from discontinued operations	0	1,159	0	2,050
Less: Income allocated to unvested participating securities	0	21	0	36
Income from discontinued operations available to common stockholders	0	1,138	0	2,014
Net income available to common stockholders	$ 4,100	$ 4,454	$ 5,603	$ 6,358
Denominator:
Denominator for basic earnings per share— weighted average shares	5,834	5,803	5,838	5,796
Effect of dilutive securities:
Common stock equivalents	0	3	0	8
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions	5,834	5,806	5,838	5,804
Basic earnings per share:
From continuing operations	$ 0.70	$ 0.57	$ 0.96	$ 0.75
From discontinued operations	0	0.20	0	0.35
Basic earnings per share	0.70	0.77	0.96	1.10
Diluted earnings per share
From continuing operations	0.70	0.57	0.96	0.75
From discontinued operations	0	0.20	0	0.35
Diluted earnings per share	$ 0.70	$ 0.77	$ 0.96	$ 1.10