Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities
Net (loss) income	$ (4,463,000)	$ 10,442,000	$ 10,819,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation & amortization	33,546,000	28,396,000	26,239,000
Amortization of debt issuance costs	595,000	756,000	691,000
Loss on disposals of property, plant and equipment	399,000	353,000	210,000
Impairment charges of property, plant and equipment	0	652,000	1,072,000
Change in leases	(1,900,000)	2,386,000	3,884,000
Stock based compensation	2,645,000	2,669,000	3,156,000
Deferred income taxes	(1,621,000)	4,429,000	9,737,000
Changes in operating assets and liabilities:
Receivables	(286,000)	(703,000)	33,000
Inventories	12,475,000	(24,836,000)	(10,964,000)
Prepaid expenses and other assets	(184,000)	(2,410,000)	4,159,000
Accounts payable	(4,503,000)	(8,201,000)	12,048,000
Income tax receivable / payable	357,000	2,229,000	(4,159,000)
Accrued expenses and other liabilities	1,503,000	2,008,000	(11,234,000)
Net cash provided by operating activities	38,563,000	18,170,000	45,691,000
Cash Flows From Investing Activities
Purchases of property, plant and equipment	(27,000,000)	(35,287,000)	(40,556,000)
Proceeds from insurance	610,000	1,033,000
Proceeds from the sale of property, plant and equipment		111,000	7,000
Net cash used in investing activities	(26,390,000)	(34,143,000)	(40,549,000)
Cash Flows From Financing Activities
Payments of long-term debt and financing lease obligations	(53,204,000)	(103,267,000)	(36,575,000)
Advances on line of credit	63,000,000	129,095,000	35,000,000
Dividends paid	(7,706,000)	(10,404,000)	(10,366,000)
Repurchases of common stock	(10,456,000)
Proceeds from exercise of stock options			1,639,000
Employee taxes paid for shares withheld	(256,000)	(119,000)	(318,000)
Debt issuance costs		(374,000)
Net cash (used in) provided by financing activities	(8,622,000)	14,931,000	(10,620,000)
Effect of exchange rate changes on cash	(14,000)	(52,000)	6,000
Net change in cash and cash equivalents	3,537,000	(1,094,000)	(5,472,000)
Cash, cash equivalents and restricted cash beginning of period	6,382,000	7,476,000	12,948,000
Cash, cash equivalents and restricted cash end of period	9,919,000	6,382,000	7,476,000
Cash, cash equivalents and restricted cash end of period	9,919,000	6,382,000	7,476,000
Supplemental disclosure of cash flow information
Purchases of property, plant and equipment included in accounts payable and accrued expenses	98,000	3,974,000	636,000
Cash paid for interest	3,735,000	2,625,000	1,822,000
Cash paid for income taxes, net of refunds	$ 471,000	$ 1,507,000	$ 7,603,000