CONSOLIDATED STATEMENTS 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	$ 9,078	$ 11,074	$ 13,860
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,749	7,466	7,267
Deferred income taxes	1,770	1,417	1,208
Excess tax benefit from stock-based payment arrangements		(1,461)
Provision for doubtful accounts	167	333	473
Provision for excess and obsolete inventory	351	432	753
Provision for warranty	(138)	142	234
Write-off of debt issue costs on Prior Credit agreement recorded in interest expense (Note 6)	1,052
Debt issue cost amortization recorded in interest expense	380
Restricted stock compensation	1,893	1,744	1,541
Other	(652)	216	429
Changes in operating assets and liabilities, excluding changes due to acquisition:
(Increase) decrease in trade receivables, net	(3,719)	3,655	(2,504)
(Increase) decrease in inventories	(928)	(2,262)	(2,864)
(Increase) decrease in prepaid expenses and other assets	69	(1,394)	194
Increase (decrease) in accounts payable	(956)	(1,874)	752
Increase (decrease) in accrued liabilities and other liabilities	(3,813)	585	(1,157)
Net cash provided by operating activities	14,303	20,073	20,186
Cash Flows From Investing Activities:
Proceeds from working capital adjustment and (consideration paid for acquisition, net of cash acquired)	(16,205)		1,397
Purchase of property and equipment	(5,188)	(4,730)	(4,046)
Net cash used in investing activities	(21,393)	(4,730)	(2,649)
Cash Flows From Financing Activities:
Borrowings (repayments) on lines-of-credit, net	(5,709)	383	(7,541)
Principal payments of long-term debt	(67,125)	(6,375)	(5,250)
Proceeds from issuance of long-term debt	76,321
Change in restricted cash obligations			1,800
Payment of debt issuance costs	(745)
Dividends paid to stockholders	(942)	(923)	(853)
Shares withheld for payment of employee payroll taxes	(1,054)	(1,559)
Excess tax benefit from stock-based payment arrangements		1,461
Stock transactions under employee benefit stock plans	834	918	344
Net cash provided by (used in) by financing activities	1,580	(6,095)	(11,500)
Effect of foreign exchange rate changes on cash	(285)	(1,083)	(1,295)
Net (decrease) increase in cash and cash equivalents	(5,795)	8,165	4,742
Cash and cash equivalents at beginning of period	21,278	13,113	8,371
Cash and cash equivalents at end of period	15,483	21,278	13,113
Net cash paid during the period for:
Interest	5,048	5,575	6,014
Income taxes	$ 1,148	$ 2,125	$ 5,921