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				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Basic earnings per share:
Net earnings	$ 2,476	$ 6,090	$ 4,709	$ 2,808	$ 8,566	$ 7,517
Basic weighted average number of shares outstanding (in shares)	4,371		4,254		4,365	4,250
Basic earnings per share (in dollars per share)	$ 0.57		$ 1.11		$ 1.96	$ 1.77
Diluted earnings per share:
Common shares (in shares)	4,371		4,254		4,365	4,250
Total diluted shares (in shares)	4,404		4,273		4,399	4,272
Diluted earnings per share (in dollars per share)	$ 0.56		$ 1.10		$ 1.95	$ 1.76
Restricted stock units awards
Diluted earnings per share:
Unit awards (in shares)	21		13		22	15
Performance share unit awards
Diluted earnings per share:
Unit awards (in shares)	12		6		12	7