Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net sales	$ 40,220	$ 39,751	$ 71,590	$ 71,460
Cutting, Sharpening and Other
Net sales	23,995	24,781	41,098	41,209
First Aid and Safety
Net sales	16,225	14,970	30,492	30,251
United States | Cutting, Sharpening and Other
Net sales	18,833	19,808	32,005	32,304
United States | First Aid and Safety
Net sales	16,225	14,970	30,492	30,251
Canada | Cutting, Sharpening and Other
Net sales	2,155	2,472	3,568	4,024
Canada | First Aid and Safety
Net sales			0	0
Europe
Net sales	3,007	2,501	5,525	4,881
Europe | Cutting, Sharpening and Other
Net sales	3,007	2,501	5,525	4,881
Europe | First Aid and Safety
Net sales			0	0
United States
Net sales	35,058	34,778	62,497	62,555
Canada
Net sales	$ 2,155	$ 2,472	$ 3,568	$ 4,024