Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Earnings (Losses) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Basic earnings per share:
Net earnings	$ 2,190	$ 2,476	$ 6,090	$ 1,546	$ 4,709	$ 2,808	$ 10,756	$ 9,063
Basic weighted average number of shares outstanding (in shares)	4,387			4,274			4,373	4,258
Basic earnings per share (in dollars per share)	$ 0.50			$ 0.36			$ 2.46	$ 2.13
Diluted earnings per share:
Common shares (in shares)	4,387			4,274			4,373	4,258
Total diluted shares (in shares)	4,420			4,297			4,406	4,280
Diluted earnings per share (in dollars per share)	$ 0.50			$ 0.36			$ 2.44	$ 2.12
Restricted stock units awards
Diluted earnings per share:
Unit awards (in shares)	20			17			21	16
Performance share unit awards
Diluted earnings per share:
Unit awards (in shares)	13			6			12	6