Earnings per common share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator
Net income - basic and diluted	$ 1,239	$ 2,190	$ 2,779	$ 3,990
Denominator
Weighted average shares outstanding - basic ( in shares)	1,486	1,477	1,485	1,476
Weighted average shares outstanding - diluted (in shares)	1,486	1,477	1,485	1,476
Earnings per share - basic (in dollars per share)	$ 0.83	$ 1.48	$ 1.87	$ 2.71
Earnings per share - diluted (in dollars per share)	$ 0.83	$ 1.48	$ 1.87	$ 2.70