Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 36,995	$ 34,731	$ 108,585	$ 106,191
Cutting, Sharpening and Other
Net sales	20,202	20,194	61,300	61,403
First Aid and Safety
Net sales	16,793	14,537	47,285	44,788
United States | Cutting, Sharpening and Other
Net sales	16,040	16,376	48,045	48,680
United States | First Aid and Safety
Net sales	16,793	14,537	47,285	44,788
Canada | Cutting, Sharpening and Other
Net sales	1,712	1,691	5,281	5,715
Canada | First Aid and Safety
Net sales
Europe
Net sales	2,450	2,127	7,974	7,008
Europe | Cutting, Sharpening and Other
Net sales	2,450	2,127	7,974	7,008
Europe | First Aid and Safety
Net sales
United States
Net sales	32,833	30,913	95,330	93,468
Canada
Net sales	$ 1,712	$ 1,691	$ 5,281	$ 5,715