CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
NET SALES	$ 192,803,000	$ 158,575,000	$ 166,918,000
COST OF PRODUCTS SOLD	133,412,000	119,895,000	131,294,000
Gross profit	59,391,000	38,680,000	35,624,000
COSTS AND EXPENSES:
General and administrative expenses	27,135,000	22,115,000	20,998,000
Selling and distribution expenses	18,589,000	16,626,000	18,745,000
Amortization of purchased intangible assets	4,060,000	4,011,000	4,033,000
Restructuring expenses	4,283,000	1,202,000	4,063,000
Goodwill impairment charge	17,584,000	0	11,464,000
Total costs and expenses	71,651,000	43,954,000	59,303,000
OPERATING LOSS	(12,260,000)	(5,274,000)	(23,679,000)
OTHER INCOME (EXPENSE):
Other income (expense), net	(1,376,000)	633,000	(669,000)
Interest expense	(1,651,000)	(1,070,000)	(1,745,000)
Interest income	3,000	3,000	4,000
LOSS BEFORE INCOME TAXES	(15,284,000)	(5,708,000)	(26,089,000)
INCOME TAX PROVISION (BENEFIT)	3,569,000	797,000	(2,118,000)
NET LOSS	$ (18,853,000)	$ (6,505,000)	$ (23,971,000)
LOSS PER SHARE
Basic (in dollars per share)	$ (1.31)	$ (0.46)	$ (1.72)
Diluted (in dollars per share)	$ (1.31)	$ (0.46)	$ (1.72)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING:
Basic (in shares)	14,346,851	14,126,108	13,935,097
Diluted (in shares)	14,346,851	14,126,108	13,935,097
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.08	$ 0.08	$ 0.14