CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net sales	$ 125,389	$ 118,251
Cost of sales	101,829	97,118
Gross profit	23,560	21,133
Selling, general and administrative expense	19,798	20,692
Restructuring charges	946	4
Income from operations	2,816	437
Interest expense	(1,440)	(1,177)
Other income/expense, net	(206)	(238)
Earnings (loss) before provision for income taxes	1,170	(978)
Provision for income taxes	39	325
Net earnings (loss) available to common stockholders	1,131	(1,303)
Class A Common Share [Member]
Net earnings (loss) available to common stockholders	$ 180	$ (240)
Net earnings (loss) per common share:
Common share - basic and diluted (in dollars per share)	$ 0.08	$ (0.11)
Weighted-average number of shares outstanding:
Common share - basic and diluted (in shares)	2,175	2,175
Class B Common Share [Member]
Net earnings (loss) available to common stockholders	$ 951	$ (1,063)
Net earnings (loss) per common share:
Common share - basic and diluted (in dollars per share)	$ 0.09	$ (0.11)
Weighted-average number of shares outstanding:
Common share - basic and diluted (in shares)	10,089	9,856