Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net sales	$ 44,847	$ 44,042	$ 88,372	$ 79,817
Cutting, Sharpening and Measuring
Net sales	21,930	23,837	42,786	39,585
First Aid and Safety
Net sales	22,917	20,205	45,586	40,232
United States
Net sales	36,840	38,472	72,888	68,915
United States | Cutting, Sharpening and Measuring
Net sales	16,162	19,699	31,726	31,427
United States | First Aid and Safety
Net sales	20,678	18,773	41,162	37,488
Canada
Net sales	3,990	2,388	7,323	4,802
Canada | Cutting, Sharpening and Measuring
Net sales	2,091	1,247	3,640	2,661
Canada | First Aid and Safety
Net sales	1,899	1,141	3,683	2,141
Europe
Net sales	4,017	3,182	8,161	6,100
Europe | Cutting, Sharpening and Measuring
Net sales	3,677	2,891	7,420	5,497
Europe | First Aid and Safety
Net sales	$ 340	$ 291	$ 741	$ 603