Note 6 - Segment Information

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

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 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 the Company’s total revenue:

	Three months ended September 30,						Nine months ended September 30,
Customers	2013			2012			2013			2012
A		33	%		36	%		32	%		32	%

Reflecting consolidations in recent years among distributors, the Company corrected the 2012 amounts 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 36% of the Company's total revenue for the three months ended September 30, 2012 (rather than as three separate customers representing 18%, 17% and 1% of revenue), and 32% of the Company’s total revenue for the nine months ended September 30, 2012 (rather than as three separate customers representing 16%, 15% and 1% of revenue). This correction had no impact on the Company's consolidated financial statements.

The following is a summary of revenue by geographic regions (in thousands):

	Three months ended September 30,				Nine months ended September 30,
Country and Region	2013		2012		2013		2012
China	$	40,577	$	31,023	$	102,099	$	95,207
Taiwan		8,886		7,579		24,726		21,814
Europe		3,949		5,004		11,226		12,987
Korea		2,599		3,022		7,425		7,581
Japan		2,285		2,029		5,446		6,690
USA		1,812		1,437		5,552		4,150
Rest of Asia		5,103		6,309		17,817		16,658
Other		136		105		240		512
Total	$	65,347	$	56,508	$	174,531	$	165,599

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

	Three months ended September 30,				Nine months ended September 30,
Product Family	2013		2012		2013		2012
DC to DC converters	$	57,823	$	49,710	$	154,801	$	145,217
Lighting control products		7,524		6,798		19,730		20,382
Total	$	65,347	$	56,508	$	174,531	$	165,599

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

	September 30, 2013		December 31, 2012
China	$	43,628	$	37,071
USA		24,738		23,163
Taiwan		80		90
Japan		40		57
Other		88		55
Total	$	68,574	$	60,436