Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017
Cash flows from operating activities:
Income from continuing operations	$ 13,650		$ 19,093	[1]
Loss from discontinued operations	(354)		(1,270)	[1]
Net income	13,296		17,823	[1],[2]
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	6,646		6,386	[3]
Provision (recovery) of allowance for doubtful accounts	(42)		375	[3]
Inventory lower-of-cost-or-market/NRV adjustments	255		294	[3]
Stock-based compensation expense	1,394		1,938	[3]
Loss on asset dispositions	32		58	[3]
Deferred income taxes, net of valuation allowance	1,476		(193)	[3]
Other	40		(101)	[3]
Changes in operating assets and liabilities:
Trade receivables	(3,352)		6,532	[3]
Inventories	(2,503)		(11,056)	[3]
Prepaids and other current assets	1,075		1,644	[3]
Income taxes receivable	(4,712)		3,170	[3]
Trade payables	(525)		(4,275)	[3]
Accrued liabilities, including warranty obligations	(3,254)		(5,875)	[3]
Net cash provided by operating activities	9,826		16,720	[3]
Cash flows from investing activities:
Purchases of available-for-sale securities	(29,522)		(57,054)	[3]
Proceeds from maturities of available-for-sale securities	46,475		41,620	[3]
Purchases of property, plant and equipment	(6,557)		(2,726)	[3]
Proceeds from sale of property, plant and equipment	4		0	[3]
Net cash provided by (used in) investing activities	10,400		(18,160)	[3]
Cash flows from financing activities:
Payments on long-term debt	(12,000)		(12,000)	[3]
Payments for stock repurchases	(4,989)		(4,848)	[3]
Proceeds from employee stock purchases	232		252	[3]
Proceeds from exercise of stock options	338		296	[3]
Tax payments related to stock award issuances	(396)		(741)	[3]
Net cash used in financing activities	(16,815)		(17,041)	[3]
Effect of exchange rate changes on cash and cash equivalents	(551)		1,088	[3]
Increase (decrease) in cash and cash equivalents	2,860		(17,393)	[3]
Cash and cash equivalents:
Beginning of period	27,893	[4]	47,874	[3]
End of period	30,753		30,481	[3]
Supplemental disclosure of cash flow information:
Cash paid for interest	799		1,228	[3]
Cash paid for income taxes, net	8,622		5,686	[3]
Supplemental disclosure of non-cash investing activities:
Capital expenditures incurred but not yet paid	$ 1,352		$ 336	[3]

[1] See Note 2.

[2] See Note 2.

[3] See Note 2.

[4] See Note 2.