Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net sales	$ 31,370	$ 31,709
Cutting, Sharpening and Other
Net sales	17,103	16,428
First Aid and Safety
Net sales	14,267	15,281
United States | Cutting, Sharpening and Other
Net sales	13,172	12,496
United States | First Aid and Safety
Net sales	14,267	15,281
Canada | Cutting, Sharpening and Other
Net sales	1,413	1,552
Canada | First Aid and Safety
Net sales	0	0
Europe
Net sales	2,518	2,380
Europe | Cutting, Sharpening and Other
Net sales	2,518	2,380
Europe | First Aid and Safety
Net sales	0	0
United States
Net sales	27,439	27,777
Canada
Net sales	$ 1,413	$ 1,552