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Summary of Significant Accounting Policies - Basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income (loss)	$ (950)	$ 3,334	$ (4,181)	$ 9,438
Less: Income (loss) allocated to unvested participating securities	(20)	61	(86)	173
Net income available to common stockholders	$ (930)	$ 3,273	$ (4,095)	$ 9,265
Denominator:
Denominator for basic earnings (loss) per share - weighted average shares	5,869	5,834	5,867	5,840
Effect of dilutive securities:
Common stock equivalents	0	0	0	0
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	5,869	5,834	5,867	5,840
Basic earnings (loss) per share:
Basic	$ (0.16)	$ 0.56	$ (0.70)	$ 1.59
Diluted earnings (loss) per share
Diluted earning (loss) per share	$ (0.16)	$ 0.56	$ (0.70)	$ 1.59

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