CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows From Operating Activities:
Net income	$ 8,036	$ 9,078	$ 11,074
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,274	9,749	7,466
Deferred income taxes	3,713	1,770	1,417
Excess tax benefit from stock-based payment arrangements			(1,461)
Provision for doubtful accounts	39	167	333
Provision for excess and obsolete inventory	480	351	432
Provision for warranty	234	(138)	142
Write-off of debt issue costs on Prior Credit agreement recorded in interest expense		1,052
Debt issue cost amortization recorded in interest expense	165	380
Restricted stock compensation	2,026	1,893	1,744
Other	(756)	(652)	216
Changes in operating assets and liabilities, excluding changes due to acquisition:
(Increase) decrease in trade receivables, net	(4,051)	(3,719)	3,655
Decrease (increase) in inventories	18	(928)	(2,262)
(Increase) decrease in prepaid expenses and other assets	(328)	69	(1,394)
Increase (decrease) in accounts payable	1,277	(956)	(1,874)
Increase (decrease) in accrued liabilities and other liabilities	4,280	(3,813)	585
Net cash provided by operating activities	25,407	14,303	20,073
Cash Flows From Investing Activities:
Purchase of property and equipment	(6,201)	(5,188)	(4,730)
Consideration paid for acquisition, net of cash acquired		(16,205)
Net cash used in investing activities	(6,201)	(21,393)	(4,730)
Cash Flows From Financing Activities:
(Repayments) borrowings on lines-of-credit, net	(518)	(5,709)	383
Principal payments of long-term debt	(18,389)	(67,125)	(6,375)
Proceeds from issuance of long-term debt		76,321
Payment of debt issuance costs		(745)
Dividends paid to stockholders	(959)	(942)	(923)
Shares withheld for payment of employee payroll taxes	(1,513)	(1,054)	(1,559)
Excess tax benefit from stock-based payment arrangements			1,461
Stock transactions under employee benefit stock plans	1,213	834	918
Net cash provided by (used in) financing activities	(20,166)	1,580	(6,095)
Effect of foreign exchange rate changes on cash	1,067	(285)	(1,083)
Net increase (decrease) in cash and cash equivalents	107	(5,795)	8,165
Cash and cash equivalents at beginning of period	15,483	21,278	13,113
Cash and cash equivalents at end of period	15,590	15,483	21,278
Net cash paid during the period for:
Interest	2,261	5,048	5,575
Income taxes	$ 2,087	$ 1,148	$ 2,125