Quarterly results of operations (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Quarterly results of operations (unaudited) [Abstract]
Net sales	$ 13,265	$ 17,190	$ 19,906	$ 22,270	$ 17,958	$ 17,856	$ 12,623	$ 9,702	$ 72,631	$ 58,139
Gross profit	6,371	8,916	10,858	12,255	8,219	8,193	5,434	2,566	38,400	24,412
Net income (loss)	$ (62)	$ 906	$ 765	$ 3,139	$ 260	$ 528	$ (2,376)	$ (4,348)	$ 4,748	$ (5,936)
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.01)	$ 0.09	$ 0.08	$ 0.32	$ 0.03	$ 0.05	$ (0.24)	$ (0.44)	$ 0.48	$ (0.6)
Diluted (in dollars per share)	$ (0.01)	$ 0.09	$ 0.08	$ 0.31	$ 0.03	$ 0.05	$ (0.24)	$ (0.44)	$ 0.47	$ (0.6)