Earnings per common share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator
Net income (loss) - basic and diluted	$ (2,553)	$ 2,153	$ 226	$ 6,143
Denominator
Weighted average shares outstanding - basic ( in shares)	1,485	1,476	1,485	1,475
Weighted average shares outstanding - diluted (in shares)	1,485	1,476	1,485	1,475
Earnings (Loss) per share - basic (in dollars per share)	$ (1.72)	$ 1.46	$ 0.15	$ 4.16
Earnings (Loss) per share - diluted (in dollars per share)	$ (1.72)	$ 1.46	$ 0.15	$ 4.16