Note 5 - Segment Information

6 Months Ended

Jun. 30, 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 two customers (both distributors) with sales greater than 10% of the Company's total revenue:

	Three Months Ended June 30,						Six Months Ended June 30
Customer	2014			2013			2014			2013
A		26	%		31	%		26	%		32	%
B		*			11	%		10	%		*

*Represents less than 10%.

The following table summarizes two customers (both distributors) with accounts receivable balances greater than 10% of the Company’s total accounts receivable:

Customer	June 30, 2014			December 31, 2013
A		33	%		32	%
B		11	%		17	%

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

	Three Months Ended June 30,				Six Months Ended June 30,
Country and Region	2014		2013		2014		2013
China	$	43,931	$	34,743	$	80,789	$	61,522
Taiwan		9,638		8,321		18,701		15,840
Europe		4,574		3,327		9,165		7,277
Korea		3,890		2,408		6,626		4,826
United States		3,231		1,839		5,834		3,740
Japan		1,713		1,640		3,854		3,161
Southeast Asia		1,407		5,385		3,421		12,714
Other		52		51		107		104
Total	$	68,436	$	57,714	$	128,497	$	109,184

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

	Three Months Ended June 30,				Six Months Ended June 30,
Product Family	2014		2013		2014		2013
DC to DC products	$	61,173	$	50,536	$	115,108	$	96,978
Lighting control products		7,263		7,178		13,389		12,206
Total	$	68,436	$	57,714	$	128,497	$	109,184

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

Country	June 30, 2014		December 31, 2013
China	$	38,248	$	41,557
United States		31,578		24,719
Other		207		205
Total	$	70,033	$	66,481