Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income from consolidated operations	$ 7,970	$ 7,593	$ 7,559
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,634	4,846	4,376
Loss on sales of property, plant and equipment	2	27	5
Share-based compensation	1,056	1,069	1,119
Deferred income taxes	576	437	1,232
Excess tax benefits on share-based compensation	(145)	(356)	(1,219)
Changes in operating assets and liabilities:
Receivables, net	(3,768)	(1,011)	562
Inventories	51	(1,309)	(1,845)
Prepaid expenses	(1,351)	(266)	26
Refundable income taxes	209	2,677	(436)
Accounts payable	(596)	(800)	2,317
Increase (Decrease) in Accrued Liabilities	(361)	(163)	(2,243)
Other liabilities	213	29	(181)
Other assets	(97)	325	(146)
Net cash provided by operating activities	9,393	13,098	11,126
Cash flows from investing activities:
Additions to property, plant and equipment	(7,293)	(16,321)	(13,436)
Proceeds from sale of property, plant and equipment	14	53	112
Net cash used in investing activities	(7,279)	(16,268)	(13,324)
Cash flows from financing activities:
Excess tax benefits on share-based compensation	145	356	1,219
Proceeds from the exercise of stock options, net of attestations	529	358	336
Principal repayment of long-term debt	(1,014)	(996)	(977)
Payment of statutory withholding for stock options exercised and restricted stock units vested	(219)	(209)	(831)
Repurchases of common stock		(587)
Payment of contingent note payable			(800)
Net cash used in financing activities	(559)	(1,078)	(1,053)
Net change in cash and cash equivalents	1,555	(4,248)	(3,251)
Cash and cash equivalents at beginning of year	29,804	34,052	37,303
Cash and cash equivalents at end of year	$ 31,359	$ 29,804	$ 34,052