Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net sales	$ 47,923	$ 43,316	$ 136,295	$ 123,133
Cutting, Sharpening and Measuring
Net sales	23,564	23,868	66,349	63,453
First Aid and Safety
Net sales	24,359	19,448	69,946	59,680
United States
Net sales	41,047	36,656	113,935	105,576
United States | Cutting, Sharpening and Measuring
Net sales	18,769	18,656	50,494	50,088
United States | First Aid and Safety
Net sales	22,278	18,000	63,441	55,488
Canada
Net sales	3,585	3,373	10,908	8,175
Canada | Cutting, Sharpening and Measuring
Net sales	1,932	2,199	5,572	4,860
Canada | First Aid and Safety
Net sales	1,653	1,174	5,336	3,315
Europe
Net sales	3,291	3,287	11,452	9,382
Europe | Cutting, Sharpening and Measuring
Net sales	2,863	3,013	10,283	8,505
Europe | First Aid and Safety
Net sales	$ 428	$ 274	$ 1,169	$ 877