Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Cash Flows
Net income (loss)	$ 8,165,000	$ (15,223,000)	$ (4,782,000)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	11,662,000	10,376,000	9,384,000
Deferred income taxes	1,097,000	(873,000)	(1,739,000)
Goodwill impairment	0	4,100,000	2,403,000
Mark-to-market of interest rate swap	0	67,000	159,000
Share-based compensation	1,355,000	1,564,000	1,743,000
Loss on foreign currency	(237,000)	(33,000)	(5,000)
Change in operating assets and liabilities, net of effects of acquisition:
Accounts receivable	4,840,000	13,044,000	(17,945,000)
Inventories	3,322,000	4,083,000	(5,783,000)
Prepaid and other assets	(2,018,000)	2,587,000	(528,000)
Accounts payable	(3,142,000)	(4,849,000)	7,822,000
Accrued and other liabilities	2,910,000	3,420,000	3,122,000
Post retirement benefits liability	(264,000)	(1,628,000)	(389,000)
Net cash (used in) provided by operating activities	28,164,000	16,701,000	(6,528,000)
Cash flows from investing activities:
Purchase of property, plant and equipment	(3,683,000)	(7,460,000)	(5,801,000)
Purchase of assets of Horizon Plastics	0	0	(63,005,000)
Net cash used in investing activities	(3,683,000)	(7,460,000)	(68,806,000)
Cash flows from financing activities:
Gross borrowings on revolving loans	56,793,000	194,414,000	133,848,000
Gross repayment on revolving loans	(68,381,000)	(199,782,000)	(116,473,000)
Proceeds from term loan	30,165,000	0	45,000,000
Payment of principal of term loan	(38,725,000)	(3,375,000)	(10,125,000)
Payment of deferred loan costs	(2,038,000)	(435,000)	(763,000)
Payments related to the purchase of treasury stock	(20,000)	(98,000)	(250,000)
Cash dividends paid	0	0	(792,000)
Net cash (used in) provided by financing activities	(22,206,000)	(9,276,000)	50,445,000
Net change in cash and cash equivalents	2,275,000	(35,000)	(24,889,000)
Cash and cash equivalents at beginning of year	1,856,000	1,891,000	26,780,000
Cash and cash equivalents at end of year	4,131,000	1,856,000	1,891,000
Cash paid for:
Interest (net of amounts capitalized)	3,854,000	3,869,000	2,261,000
Income taxes	570,000	1,284,000	1,033,000
Non Cash:
Fixed asset purchases in accounts payable	$ 147,000	$ 158,000	$ 871,000