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Revenue recognition - Schedule of Disaggregation of Net Sales By Reporting Unit (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation Of Revenue [Line Items]
Net sales	$ 39,950	$ 33,667	$ 120,588	$ 107,525
Security Products
Disaggregation Of Revenue [Line Items]
Net sales	30,266	26,567	91,179	84,667
Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	$ 9,684	$ 7,100	$ 29,409	$ 22,858

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