CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
NET SALES	$ 87,883	$ 52,161	$ 236,111	$ 138,314
COST OF PRODUCTS SOLD	58,155	34,999	156,855	96,767
Gross profit	29,728	17,162	79,256	41,547
COSTS AND EXPENSES:
General and administrative expenses	9,630	6,535	27,550	19,821
Selling and distribution expenses	5,420	4,446	16,427	13,420
Amortization of purchased intangible assets	769	1,046	2,365	3,034
Restructuring expenses	192	0	553	458
Anti-dumping duty penalties	4,897	0	8,000	0
Goodwill impairment charge	0	17,584	0	17,584
Total costs and expenses	20,908	29,611	54,895	54,317
OPERATING INCOME (LOSS)	8,820	(12,449)	24,361	(12,770)
OTHER INCOME (EXPENSE):
Other expense, net	(335)	(436)	(1,039)	(965)
Interest expense	(495)	(367)	(1,098)	(1,203)
Interest income	0	0	2	2
INCOME (LOSS) BEFORE INCOME TAXES	7,990	(13,252)	22,226	(14,936)
INCOME TAX PROVISION	3,080	812	7,024	1,956
NET INCOME (LOSS)	$ 4,910	$ (14,064)	$ 15,202	$ (16,892)
INCOME (LOSS) PER SHARE
Basic (in dollars per share)	$ 0.33	$ (0.98)	$ 1.02	$ (1.18)
Diluted (in dollars per share)	$ 0.33	$ (0.98)	$ 1.02	$ (1.18)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING:
Basic (in shares)	14,571,155	14,368,225	14,518,765	14,333,452
Diluted (in shares)	14,571,155	14,368,225	14,518,765	14,333,452
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.02	$ 0.02	$ 0.06	$ 0.06