Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities:
Net income	$ 4,275	$ 10,662	$ 7,610
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	19,133	18,918	18,823
Deferred income tax	(517)	1,850	(7,593)
Share-based compensation expense	1,390	1,442	1,564
Changes in assets and liabilities:
Accounts receivable, net	(2,977)	(7,628)	(5,567)
Inventory, net	(14,965)	(20,373)	(27,378)
Accounts payable	(1,412)	5,293	14,178
Accrued employment costs	(3,490)	3,865	272
Income taxes	84	(246)	77
Other, net	(5,930)	2,824	(881)
Net cash (used in) provided by operating activities	(4,409)	16,607	1,105
Investing Activities:
Capital expenditures	(17,354)	(15,388)	(7,996)
Proceeds from sale of property, plant and equipment		10	70
Net cash used in investing activities	(17,354)	(15,378)	(7,926)
Financing Activities:
Borrowings under revolving credit facility	174,907	368,910	350,314
Payments on revolving credit facility	(153,632)	(388,728)	(338,836)
Proceeds under New Markets Tax Credit financing, net		2,835
Payments on term loan facility, finance leases, and notes	(3,904)	(12,364)	(5,078)
Payments of financing costs		(1,109)
Proceeds from public offering, net of cash expenses		32,246
Proceeds from the exercise of stock options	471	865	553
Net cash provided by financing activities	17,842	2,655	6,953
Net (decrease) increase in cash and restricted cash	(3,921)	3,884	132
Cash and restricted cash at beginning of period	4,091	207	75
Cash and restricted cash at end of period	170	4,091	207
Supplemental Disclosure of Cash Flow Information:
Interest paid	3,670	4,183	4,027
Income taxes paid (refunded), net	$ 69	$ 102	$ (85)