Earnings per common share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator
Net income - basic and diluted	$ 2,153	$ 2,899	$ 6,143	$ 10,090
Denominator
Weighted average shares outstanding - basic (in shares)	1,476	1,468	1,475	1,467
Weighted average shares outstanding - diluted (in shares)	1,476	1,468	1,475	1,467
Earnings per share - basic (in dollars per share)	$ 1.46	$ 1.97	$ 4.16	$ 6.88
Earnings per share - diluted (in dollars per share)	$ 1.46	$ 1.97	$ 4.16	$ 6.88