Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net sales	$ 44,042	$ 40,220	$ 79,817	$ 71,590
Cutting, Sharpening and Measuring
Net sales	23,837	23,803	39,585	40,604
First Aid and Safety
Net sales	20,205	16,417	40,232	30,986
United States
Net sales	38,472	34,958	68,915	62,423
United States | Cutting, Sharpening and Measuring
Net sales	19,699	18,733	31,427	31,931
United States | First Aid and Safety
Net sales	18,773	16,225	37,488	30,492
Canada
Net sales	2,388	2,216	4,802	3,628
Canada | Cutting, Sharpening and Measuring
Net sales	1,247	2,216	2,661	3,628
Canada | First Aid and Safety
Net sales	1,141		2,141
Europe
Net sales	3,182	3,046	6,100	5,539
Europe | Cutting, Sharpening and Measuring
Net sales	2,891	2,854	5,497	5,045
Europe | First Aid and Safety
Net sales	$ 291	$ 192	$ 603	$ 494