Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income	$ 4,734	$ 4,171	$ 6,104	$ 5,700
Less: Income allocated to unvested participating securities	88	71	114	97
Net income available to common stockholders	$ 4,646	$ 4,100	$ 5,990	$ 5,603
Denominator:
Denominator for basic earnings per share- weighted average shares	5,844	5,834	5,843	5,838
Effect of dilutive securities:
Common stock equivalents	0	0	0	0
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	5,844	5,834	5,843	5,838
Earnings per share:
Basic	$ 0.80	$ 0.70	$ 1.03	$ 0.96
Diluted	$ 0.80	$ 0.70	$ 1.03	$ 0.96