Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Income from continuing operations	$ 26,803	$ 20,383	$ 48,124
Loss from discontinued operations	(201)	(1,588)	(170)
Net income	26,602	18,795	47,954
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,412	4,024	3,344
Bad debt expense	786	104	588
Inventory lower-of-cost-or-market adjustments	1,583	457	557
Stock-based compensation expense	1,484	1,066	454
Loss on asset disposals	313	145	2
Deferred income taxes, net of valuation allowances	11,669	8,007	(32,814)
Excess tax (benefit) deficiency related to stock-based awards	(28)	180	145
Changes in operating assets and liabilities, net of effects of acquisition:
Trade receivables	(6,812)	(1,331)	(4,417)
Inventories	(7,147)	(9,560)	2,388
Prepaids and other current assets	1,365	(314)	(1,174)
Income taxes receivable	(389)	30	(91)
Trade payables	4,506	10,456	4,487
Accrued liabilities, including warranty obligations	3,776	2,313	(337)
Net cash provided by operating activities	41,120	34,372	21,086
Cash flows from investing activities:
Proceeds from sale of discontinued operations	0	0	116
Proceeds from other asset sales	0	0	5
Acquisition of business, net of cash acquired	(114,062)	0	0
Purchases of property, plant and equipment and intangible assets	(5,734)	(3,181)	(3,590)
Purchases of available-for-sale-securities	(61,933)	(37,434)	0
Proceeds from maturities of available-for-sale securities	55,292	10,450	0
Proceeds from sales of available-for-sale securities	3,602	0	0
Net cash used in investing activities	(122,835)	(30,165)	(3,469)
Cash flows from financing activities:
Proceeds from long-term debt	80,000	0	0
Proceeds from employee stock purchases	116	0	0
Tax payments related to stock award issuances	1,050	378	357
Excess tax benefit (deficiency) related to stock-based awards	(775)	0	0
Excess tax benefit (deficiency) related to stock-based awards	28	(180)	(145)
Payments for stock repurchases	(11,567)	0	0
Net cash provided by financing activities	68,852	198	212
Effect of exchange rate changes on cash and cash equivalents	(1,565)	(178)	(57)
Increase (decrease) in cash and cash equivalents	(14,428)	4,227	17,772
Beginning of year	45,206	40,979	23,207
End of year	30,778	45,206	40,979
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net	(1,308)	(923)	(450)
Cash paid for interest	(22)	(25)	(36)
Acquisition consideration owed but not yet paid	2,813	0	0
Capital expenditures incurred but not yet paid	1,000	86	0
Loan fees incurred but not yet paid	$ 36	$ 0	$ 0