Note 6 - Segment Information

3 Months Ended

Mar. 31, 2013

Segment Reporting Disclosure [Text Block]

6. Segment Information

As defined by the requirements of ASC 280-10-55, Segment Reporting – Overall – Implementation Guidance and Illustrations, the Company operates in one reportable segment that includes the design, development, marketing and sale of high-performance, mixed-signal analog semiconductors for the communications, computing, consumer and industrial markets. The Company’s chief operating decision maker is its chief executive officer. The Company does not specifically allocate any of its resources to or measure the performance of, individual product families. The Company derives a substantial majority of its revenue from sales to customers located outside North America, with geographic revenue based on the customers’ ship-to location.

The following is a list of customers whose sales exceeded 10% of revenue for the three months ended March 31, 2013 and 2012:

		Three months ended March 31,
Customers		2013			2012
	A		34	%		29	%

Reflecting consolidations in recent years among distributors, the Company corrected the 2012 amount reported in the table above from the amounts previously reported to disclose a group of entities under common control as a single customer, rather than as separate customers. Under the corrected disclosure, Customer A is reported as representing 29% of the Company's total revenue for the three months ended March 31, 2012 (rather than as two separate customers representing 15% and 14% of revenue as previously reported). This correction had no impact on the Company's condensed consolidated balance sheet, condensed consolidated statements of operations, condensed consolidated statements of cash flows or condensed consolidated statements of comprehensive income.

The following is a summary of revenue by geographic region based on customers’ ship-to location (in thousands):

	Three months ended March 31,
Country	2013		2012
China	$	26,779	$	29,093
Taiwan		7,519		6,415
Europe		3,950		4,190
Japan		1,521		2,306
Korea		2,418		1,959
USA		1,901		1,112
Rest of Asia		7,329		5,054
Other		53		355
Total	$	51,470	$	50,484

The following is a summary of revenue by product family (in thousands):

	Three months ended March 31,
Product Family	2013		2012
DC to DC converters	$	46,442	$	44,342
Lighting control products		5,028		6,142
Total	$	51,470	$	50,484

The following is a summary of long-lived assets by geographic region (in thousands):

	March 31, 2013		December 31, 2012
China	$	38,694	$	37,071
USA		25,085		23,163
Taiwan		83		90
Japan		49		57
Other		65		55
Total	$	63,976	$	60,436