Note 5 - Segment Information

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

5. Segment Information

As defined by the requirements of ASC 280-10-55, Segment Reporting – Overall – Implementation, 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, storage and computing, consumer and industrial markets. The Company’s chief operating decision maker is its chief executive officer. 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 locations.

The following table summarizes those distributors with sales greater than 10% of the Company's total revenue:

	Three Months Ended March 31,
Customer	2014			2013
A		26	%		34	%
B		10	%		*

*Represents less than 10%.

The following table summarizes those distributors with accounts receivable balances greater than 10% of the Company’s total accounts receivable:

Customer	March 31, 2014			December 31, 2013
A		24	%		32	%
B		16	%		17	%

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

	Three Months Ended March 31,
Country and Region	2014		2013
China	$	36,859	$	26,779
Taiwan		9,064		7,519
Europe		4,591		3,950
Korea		2,736		2,418
United States		2,603		1,901
Japan		2,141		1,521
Southeast Asia		2,013		7,329
Other		54		53
Total	$	60,061	$	51,470

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

	Three Months Ended March 31,
Product Family	2014		2013
DC to DC products	$	53,935	$	46,442
Lighting control products		6,126		5,028
Total	$	60,061	$	51,470

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

Country	March 31, 2014		December 31, 2013
China	$	39,093	$	41,557
United States		31,753		24,719
Other		210		205
Total	$	71,056	$	66,481