Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net sales	$ 43,316	$ 36,995	$ 123,133	$ 108,585
Cutting, Sharpening and Measuring
Net sales	23,868	19,938	63,453	60,542
First Aid and Safety
Net sales	19,448	17,057	59,680	48,043
United States
Net sales	36,656	32,833	105,576	95,330
United States | Cutting, Sharpening and Measuring
Net sales	18,656	16,040	50,088	48,045
United States | First Aid and Safety
Net sales	18,000	16,793	55,488	47,285
Canada
Net sales	3,373	1,712	8,175	5,281
Canada | Cutting, Sharpening and Measuring
Net sales	2,199	1,712	4,860	5,281
Canada | First Aid and Safety
Net sales	1,174		3,315
Europe
Net sales	3,287	2,450	9,382	7,974
Europe | Cutting, Sharpening and Measuring
Net sales	3,013	2,186	8,505	7,216
Europe | First Aid and Safety
Net sales	$ 274	$ 264	$ 877	$ 758