Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 1,075	$ 1,653
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,367	1,153
Gain on sale of fixed assets	(4)	(31)
Share-based compensation	201	210
Excess tax benefits on share-based compensation		(183)
Deferred income taxes	87	96
Changes in operating assets and liabilities:
Receivables, net	(2,895)	(1,753)
Inventories	984	(32)
Prepaid expenses	(1,496)	(1,396)
Refundable income taxes	289	796
Other assets	(6)	(51)
Accounts payable	(218)	(1,062)
Accrued expenses	(2,007)	(720)
Other liabilities	215	166
Net cash used in operating activities	(2,408)	(1,154)
Cash flows from investing activities:
Additions to property, plant and equipment	(1,602)	(8,522)
Proceeds from sale of fixed assets	4	31
Net cash used in investing activities	(1,598)	(8,491)
Cash flows from financing activities:
Principal repayments of long-term debt	(251)	(247)
Proceeds from the exercise of stock options, net of attestation		128
Excess tax benefit on share-based compensation		183
Payment of statutory withholdings for stock options exercised and restricted stock units vested	(88)	(79)
Net cash used in financing activities	(339)	(15)
Net decrease in cash and cash equivalents	(4,345)	(9,660)
Cash and cash equivalents at beginning of period	29,804	34,052
Cash and cash equivalents at end of period	$ 25,459	$ 24,392