Note 7 - Segment and Geographic Information

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

7. SEGMENT AND GEOGRAPHIC INFORMATION

The Company operates in one reportable segment that includes the design, development, marketing and sale of high-performance power solutions for the cloud computing, telecommunications, industrial and automotive, and consumer markets. The Company’s chief operating decision maker is its chief executive officer, who reviews financial information presented on a consolidated basis. 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 Company sells its products primarily through third-party distributors, value-added resellers and directly to original equipment manufacturers, original design manufacturers, and electronic manufacturing service providers. The following table summarizes those customers with sales greater than 10% of the Company's total revenue:

	Three Months Ended June 30,						Six Months Ended June 30,
Customers	2015			2014			2015			2014
Distributor A		23	%		26	%		24	%		26	%
Distributor B		*			*			*			10	%

* Represents less than 10%. 

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

	June 30,			December 31,
Customers	2015			2014
Distributor A		23	%		31	%
Distributor B		10	%		10	%

Both of the customers are third-party distributors. The Company’s agreements with these distributors were made in the ordinary course of business and may be terminated with or without cause by these distributors with advance notice. Although the Company may experience a short-term disruption in the distribution of its products and a short-term decline in revenue if its agreement with either of these distributors was terminated, the Company believes that such termination would not have a material adverse effect on its financial statements because it would be able to engage alternative distributors, resellers and other distribution channels to deliver its products to end customers within a few quarters following the termination of an agreement with the distributor.

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

	Three Months Ended June 30,				Six Months Ended June 30,
Country or Region	2015		2014		2015		2014
China	$	53,450	$	43,931	$	99,252	$	80,789
Taiwan		10,143		9,638		21,172		18,701
Europe		5,317		4,574		10,432		9,165
Korea		5,109		3,890		9,354		6,626
Southeast Asia		3,336		1,407		7,075		3,421
Japan		2,412		1,713		4,297		3,854
United States		1,566		3,231		3,259		5,834
Other		83		52		113		107
Total	$	81,416	$	68,436	$	154,954	$	128,497

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

	Three Months Ended June 30,				Six Months Ended June 30,
Product Family	2015		2014		2015		2014
DC to DC products	$	73,195	$	61,173	$	139,492	$	115,108
Lighting control products		8,221		7,263		15,462		13,389
Total	$	81,416	$	68,436	$	154,954	$	128,497

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

	June 30,		December 31,
Country	2015		2014
China	$	36,828	$	37,147
United States		36,047		33,913
Bermuda		12,650		13,383
Other		353		339
Total	$	85,878	$	84,782