Monolithic Power Systems (MPWR) 10-Q 1 May 14 2014 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 25, 2014
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'MONOLITHIC POWER SYSTEMS INC	'
Document Type	'10-Q	'
Current Fiscal Year End Date	'--12-31	'
Entity Common Stock, Shares Outstanding	'	38,605,790
Amendment Flag	'false	'
Entity Central Index Key	'0001280452	'
Entity Current Reporting Status	'Yes	'
Entity Voluntary Filers	'No	'
Entity Filer Category	'Accelerated Filer	'
Entity Well-known Seasoned Issuer	'No	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$88,885	$101,213
Short-term investments	139,750	125,126
Accounts receivable, net of allowances of $0 as of March 31, 2014 and December 31, 2013	22,057	23,730
Inventories	39,829	39,737
Deferred income tax assets, net	292	294
Prepaid expenses and other current assets	2,444	1,986
Total current assets	293,257	292,086
Property and equipment, net	65,897	64,837
Long-term investments	9,843	9,860
Deferred income tax assets, net	476	481
Other long-term assets	5,159	1,644
Total assets	374,632	368,908
Current liabilities:	'	'
Accounts payable	11,748	10,694
Accrued compensation and related benefits	10,332	10,419
Accrued liabilities	8,559	17,376
Total current liabilities	30,639	38,489
Income tax liabilities	5,652	5,542
Other long-term liabilities	3,674	1,478
Total liabilities	39,965	45,509
Commitments and contingencies (Notes 6 and 8)	'	'
Stockholders' equity:	'	'
Common stock, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 38,672 and 38,291 as of March 31, 2014 and December 31, 2013, respectively	237,059	234,201
Retained earnings	91,956	82,938
Accumulated other comprehensive income	5,652	6,260
Total stockholders’ equity	334,667	323,399
Total liabilities and stockholders’ equity	$374,632	$368,908

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Per Share data, unless otherwise specified
Allowances (in Dollars)	$0	$0
Common stock, par value (in Dollars per share)	$0.00	$0.00
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	38,672	38,291
Common stock, shares outstanding	38,672	38,291

Condensed_Consolidated_Stateme

Condensed Consolidated Statements Of Operations (Unaudited) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue	$60,061	$51,470
Cost of revenue	27,964	24,085
Gross profit	32,097	27,385
Operating expenses:	'	'
Research and development	15,603	12,123
Selling, general and administrative	16,109	13,258
Litigation benefit, net	-8,700	-301
Total operating expenses	23,012	25,080
Income from operations	9,085	2,305
Interest and other income (expense), net	190	-10
Income before income taxes	9,275	2,295
Income tax provision (benefit)	257	-204
Net income	$9,018	$2,499
Basic net income per share (in Dollars per share)	$0.23	$0.07
Diluted net income per share (in Dollars per share)	$0.23	$0.07
Weighted average common shares outstanding:	'	'
Basic (in Shares)	38,470	36,259
Diluted (in Shares)	39,517	37,708

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net income	$9,018	$2,499
Other comprehensive income (loss), net of tax:	'	'
Change in unrealized losses on securities, net of tax	-17	'
Foreign currency translation adjustments	-596	303
Total other comprehensive income (loss), net of tax	-608	281
Comprehensive income	8,410	2,780
Auction Rate Securities [Member]	'	'
Other comprehensive income (loss), net of tax:	'	'
Change in unrealized losses on securities, net of tax	-17	-15
Available-for-sale Securities [Member]	'	'
Other comprehensive income (loss), net of tax:	'	'
Change in unrealized losses on securities, net of tax	$5	($7)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (Parentheticals) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Auction Rate Securities [Member]	'	'
Change in unrealized losses on securities, tax	$0	$0
Available-for-sale Securities [Member]	'	'
Change in unrealized losses on securities, tax	$0	$0

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:	'	'
Net income	$9,018	$2,499
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	3,182	2,709
Amortization and realized loss (gain) on investments	71	98
Excess tax benefit from stock option transactions	'	-132
Stock-based compensation	7,598	4,660
Changes in operating assets and liabilities:	'	'
Accounts receivable	1,673	-3,285
Inventories	-81	-2,836
Prepaid expenses and other current assets	-2,036	315
Accounts payable	1,058	2,135
Accrued liabilities	-8,473	1,889
Accrued income taxes payable and noncurrent tax liabilities	38	-526
Accrued compensation and related benefits	-63	-822
Net cash provided by operating activities	11,985	6,704
Cash flows from investing activities:	'	'
Property and equipment purchases	-4,516	-3,435
Purchases of short-term investments	-41,977	-17,590
Proceeds from sale of short-term investments	27,252	21,250
Proceeds from sale of long-term investments	'	25
Net cash provided by (used in) investing activities	-19,241	250
Cash flows from financing activities:	'	'
Proceeds from issuance of common shares	5,554	9,839
Proceeds from employee stock purchase plan	1,053	1,167
Repurchases of common shares	-11,358	'
Excess tax benefits from stock option transactions	'	132
Net cash provided by (used in) financing activities	-4,751	11,138
Effect of change in exchange rates	-321	91
Net increase (decrease) in cash and cash equivalents	-12,328	18,183
Cash and cash equivalents, beginning of period	101,213	75,104
Cash and cash equivalents, end of period	88,885	93,287
Supplemental disclosures for cash flow information:	'	'
Cash paid for taxes	217	324
Supplemental disclosures of non-cash activities:	'	'
Liability accrued for property and equipment purchases	$445	$4,230

Note_1_Basis_of_Presentation

Note 1 - Basis of Presentation	3 Months Ended
	Mar. 31, 2014
Disclosure Text Block [Abstract]	'
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	'
	1. Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements have been prepared by Monolithic Power Systems, Inc. (the “Company” or “MPS”) in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) have been condensed or omitted in accordance with these rules and regulations. The information in this report should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2013, filed with the SEC on March 10, 2014.
	In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments) necessary to present fairly the Company’s financial position, results of operations and cash flows for the interim periods presented. The financial statements contained in this Form 10-Q are not necessarily indicative of the results that may be expected for the year ending December 31, 2014 or for any other future period.
	Summary of Significant Accounting Policies
	There have been no changes to the Company’s significant accounting policies during the three months ended March 31, 2014 as compared to the significant accounting policies described in the Company’s audited consolidated financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2013.
	Recently Adopted Accounting Pronouncement
	In July 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The standard gives guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists, with the purpose of reducing diversity in practice. This new standard requires the netting of unrecognized tax benefits against a deferred tax asset for a loss or other carryforward that would apply in settlement of the uncertain tax positions. The Company adopted this standard in the first quarter of 2014 prospectively and the adoption did not have an impact on its consolidated financial position, results of operations, or cash flows.

Note_2_StockBased_Compensation

Note 2 - Stock-Based Compensation	3 Months Ended
	Mar. 31, 2014
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity Note Disclosure [Text Block]	'
	2. Stock-Based Compensation
	Stock Plans
	As of March 31, 2014, approximately 2.9 million shares were available for future issuance under the 2004 Equity Incentive Plan (the “2004 Plan”). The 2004 Plan will expire on November 12, 2014. Once the 2004 Plan expires, the Company will no longer be able to grant equity awards under the 2004 Plan, and any shares otherwise remaining available for future grants under the 2004 Plan will no longer be available for issuance.
	The Company’s Board of Directors adopted the 2014 Equity Incentive Plan (the “2014 Plan”) in April 2013, and the Company’s stockholders approved it in June 2013. The 2014 Plan will become effective on November 13, 2014, the day after the 2004 Plan expires. The 2014 Plan provides for the issuance of up to 5,500,000 shares and will expire on November 13, 2024.
	Stock-Based Compensation Expense
	The Company recognized stock-based compensation expenses as follows (in thousands):
			Three Months Ended March 31,
			2014			2013
	Cost of revenue		$	205		$	156
	Research and development			2,005			1,373
	Selling, general and administrative			5,388			3,131
	Tax benefit			-			(47	)
	Total		$	7,598		$	4,613
	Restricted Stock
	The Company’s restricted stock units (“RSUs”) include time-based RSUs, performance-based RSUs (“PSUs”) and market-based RSUs (“MSUs”). A summary of the RSUs is presented in the table below:
			Time-Based			Weighted-			PSUs			Weighted-		MSUs		Weighted-		Total			Weighted-
			RSUs			Average Grant						Average Grant				Average Grant					Average Grant
						Date Fair						Date Fair				Date Fair					Date Fair
						Value Per						Value Per				Value Per					Value Per
						Share						Share				Share					Share
	Outstanding at January 1, 2014			754,306		$	19.41			1,027,782		$	23.02		1,800,000	$	23.57		3,582,088		$	22.53
	Awards granted (1)			120,135		$	32.06			756,684		$	31.58		-	$	-		876,819		$	31.65
	Performance adjustment (2)			-		$	-			(155,255	)	$	29.65		-	$	-		(155,255	)	$	29.65
	Awards released			(145,524	)	$	18.97			(165,136	)	$	17.76		-	$	-		(310,660	)	$	18.33
	Awards forfeited			(3,892	)	$	18.39			-		$	-		-	$	-		(3,892	)	$	18.39
	Outstanding at March 31, 2014			725,025		$	21.6			1,464,075		$	27.33		1,800,000	$	23.57		3,989,100		$	24.59
	-1	The number of PSUs granted reflects the maximum number of shares that can ultimately be earned assuming the achievement of the highest level of performance conditions under the programs.
	-2	The performance adjustment reflects the number of PSUs that have not been earned or will not ultimately be earned based on management’s probability assessment.
	The intrinsic value related to awards released for the three months ended March 31, 2014 and 2013 was $10.2 million and $8.7 million, respectively. As of March 31, 2014, the total intrinsic value of outstanding awards was $154.7 million, based on the closing stock price of $38.77. As of March 31, 2014, unamortized compensation expense related to outstanding awards was approximately $61.2 million with a weighted-average remaining recognition period of approximately six years.
	2014 Time-Based RSUs and PSUs:
	In February 2014, the Board of Directors granted 336,000 shares to the Company’s executive officers. These grants included 25% time-based RSUs which vest over two years on a quarterly basis, and 75% PSUs which represent a target number of RSUs to be awarded based on the Company achieving an average two-year (2014 and 2015) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as determined by the Semiconductor Industry Association (“2014 Executive PSUs”). The maximum number of 2014 Executive PSUs that an executive officer can ultimately earn is 300% of the target shares granted. Half of the 2014 Executive PSUs will vest in February 2016 if the pre-determined performance goals are met and approved by the Compensation Committee and the executive officer is employed by the Company. The remaining shares will vest over the following two years on a quarterly basis, subject to continued employment.
	Stock Options
	A summary of the stock options activities is presented in the table below:
			Stock Options			Weighted-Average			Weighted-Average			Aggregate Intrinsic
						Exercise Price			Remaining			Value
									Contractual Term
									(Years)
	Outstanding at January 1, 2014			1,356,446		$	15.86			1.9		$	25,505,753
	Options exercised			(350,920	)	$	15.83			-		$	-
	Options forfeited and expired			(1,167	)	$	11.48			-		$	-
	Outstanding at March 31, 2014			1,004,359		$	15.87			1.7		$	22,998,787
	Options exercisable at March 31, 2014 and expected to vest			1,002,281		$	15.88			1.7		$	22,942,298
	Options exercisable at March 31, 2014			942,757		$	16.01			1.5		$	21,459,665
	Total intrinsic value of options exercised was $6.9 million and $5.6 million for the three months ended March 31, 2014 and 2013, respectively. The net cash proceeds from the exercise of stock options were $5.6 million and $9.8 million for the three months ended March 31, 2014 and 2013, respectively. At March 31, 2014, unamortized compensation expense related to unvested options was approximately $0.4 million with a weighted-average remaining recognition period of approximately one year.
	Employee Stock Purchase Plan
	For the three months ended March 31, 2014 and 2013, 43,000 and 65,000 shares, respectively, were issued under the Employee Stock Purchase Plan. As of March 31, 2014, 4.8 million shares were available for future issuance.
	The intrinsic value of stock purchased was $0.5 million for both the three months ended March 31, 2014 and 2013. As of March 31, 2014, the unamortized expense was $0.2 million, which will be recognized over five months. The Black-Scholes model was used to value the employee stock purchase rights with the following assumptions:
			Three Months Ended March 31,
			2014			2013
	Expected term (years)			0.5			0.5
	Expected volatility			33.9	%		28.5	%
	Risk-free interest rate			0.1	%		0.1	%
	Dividend yield			-			-
	Cash proceeds from employee stock purchases for the three months ended March 31, 2014 and 2013 were $1.1 million and $1.2 million, respectively.

Note_3_Balance_Sheet_Component

Note 3 - Balance Sheet Components	3 Months Ended
	Mar. 31, 2014
Disclosure Text Block Supplement [Abstract]	'
Supplemental Balance Sheet Disclosures [Text Block]	'
	3. Balance Sheet Components
	Inventories
	Inventories consist of the following (in thousands):
		March 31,			December 31,
		2014			2013
	Work in process	$	24,874		$	26,605
	Finished goods		14,955			13,132
	Total inventories	$	39,829		$	39,737
	Other Long-Term Assets
	Other long-term assets consist of the following (in thousands):
		March 31,			December 31,
		2014			2013
	Deferred compensation plan assets	$	2,570		$	607
	Prepaid expense		1,632			57
	Other		957			980
	Total other long-term assets	$	5,159		$	1,644
	Accrued Liabilities
	Accrued liabilities consist of the following (in thousands):
		March 31,			December 31,
		2014			2013
	Proceeds from litigation (see Note 6)	$	-		$	9,489
	Deferred revenue and customer prepayments		2,940			2,523
	Stock rotation reserve		1,779			1,459
	Sales rebate		1,072			900
	Commissions		786			931
	Warranty		334			451
	Other		1,648			1,623
	Total accrued liabilities	$	8,559		$	17,376
	A roll-forward of the warranty reserve is as follows (in thousands):
		Three Months Ended March 31,
		2014			2013
	Balance at beginning of period	$	451		$	331
	Warranty provision for product sales		60			103
	Settlements made		(74	)		(93	)
	Unused warranty provision		(103	)		(66	)
	Balance at end of period	$	334		$	275
	Other Long-Term Liabilities
	Other long-term liabilities consist of the following (in thousands):
		March 31,			December 31,
		2014			2013
	Deferred compensation plan liabilities	$	2,567		$	628
	Other		1,107			850
	Total other long-term liabilities	$	3,674		$	1,478

Note_4_Net_Income_Per_Share

Note 4 - Net Income Per Share	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share [Text Block]	'
	4. Net Income per Share
	Basic net income per share is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted net income per share reflects the potential dilution that would occur if outstanding securities or other contracts to issue common stock were exercised or converted into common stock, and calculated using the treasury stock method. The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):
		Three Months Ended March 31,
		2014		2013
	Numerator:
	Net income	$	9,018	$	2,499
	Denominator:
	Weighted average outstanding shares used to compute basic net income per share		38,470		36,259
	Effect of dilutive securities		1,047		1,449
	Weighted average outstanding shares used to compute diluted net income per share		39,517		37,708
	Net income per share - basic	$	0.23	$	0.07
	Net income per share - diluted	$	0.23	$	0.07
	For the three months ended March 31, 2014, there were no anti-dilutive common stock equivalents. For the three months ended March 31, 2013, approximately 0.2 million common stock equivalents were excluded from the calculation of diluted net income per share because their inclusion would have been anti-dilutive.

Note_5_Segment_Information

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

Note_6_Litigation

Note 6 - Litigation	3 Months Ended
	Mar. 31, 2014
Disclosure Text Block Supplement [Abstract]	'
Legal Matters and Contingencies [Text Block]	'
	6. Litigation
	The Company and certain of its subsidiaries are parties to actions and proceedings in the ordinary course of business, including litigation regarding its shareholders and its intellectual property, challenges to the enforceability or validity of its intellectual property and claims that the Company’s products infringe on the intellectual property rights of others. These proceedings often involve complex questions of fact and law and may require the expenditure of significant funds and the diversion of other resources to prosecute and defend. The Company defends itself vigorously against any such claims.
	O2 Micro
	In May 2012, the United States District Court for the Northern District of California (the “District Court”) issued an order finding O2 Micro International, Ltd. (“O2 Micro”) liable for approximately $9.1 million in attorneys’ fees and non-taxable costs, plus interest, in connection with the patent litigation that the Company won in 2010.  This award was in addition to the approximately $0.3 million in taxable costs that the District Court had earlier ordered O2 Micro to pay to the Company in connection with the same lawsuit.  In October 2012, O2 Micro appealed the District Court’s judgment to the United States Court of Appeals for the Federal Circuit (the “Federal Circuit”). In August 2013, the Federal Circuit affirmed O2 Micro’s liability for the full amount of the award.  In September 2013, O2 Micro filed a petition for rehearing of that ruling, but the Federal Circuit denied O2 Micro’s petition for rehearing on October 16, 2013.
	In November 2013, the Company received a cash payment of $9.5 million from O2 Micro. In January 2014, O2 Micro filed an appeal with the United States Supreme Court. Had O2 Micro been successful in obtaining a favorable ruling against the Company, MPS could have been liable to return a portion or all of the $9.5 million to O2 Micro. Accordingly, the Company recorded the $9.5 million as a current liability as of December 31, 2013.
	In March 2014, the Supreme Court declined to hear the case. As O2 Micro has no further legal avenues to appeal, the Company released the current liability of $9.5 million and recorded the amount in litigation benefit, net, in the Condensed Consolidated Statement of Operations in the first quarter of 2014. In addition, the Company incurred additional legal fees of $500,000 in connection with the final resolution of the lawsuit.

Note_7_Cash_Cash_Equivalents_a

Note 7 - Cash, Cash Equivalents and Investments	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures [Text Block]	'
	7. Cash, Cash Equivalents and Investments
	The following is a summary of the Company’s cash and cash equivalents, short-term and long-term investments (in thousands):
		Estimated Fair Market Value as of
		March 31,			December 31,
		2014			2013
	Cash, cash equivalents and investments:
	Cash	$	62,857		$	62,625
	Money market funds		26,028			35,588
	U.S. treasuries and government agency bonds		139,750			128,126
	Auction-rate securities backed by student-loan notes		9,843			9,860
	Total cash, cash equivalents and investments	$	238,478		$	236,199
	Reported as:	March 31,			December 31,
		2014			2013
	Cash and cash equivalents	$	88,885		$	101,213
	Short-term investments		139,750			125,126
	Long-term investments		9,843			9,860
	Total cash, cash equivalents and investments	$	238,478		$	236,199
	For the three months ended March 31, 2014, the Company did not redeem any auction-rate securities. For the three months ended March 31, 2013, the Company redeemed $25,000 of auction-rate securities at par.
	The contractual maturities of the Company’s short-term and long-term available-for-sale investments are as follows (in thousands):
		March 31,			December 31,
		2014			2013
	Due in less than 1 year	$	89,651		$	95,509
	Due in 1 - 5 years		50,099			29,617
	Due in greater than 5 years		9,843			9,860
		$	149,593		$	134,986
	The following tables summarize unrealized gains and losses related to our investments in marketable securities designated as available-for sale (in thousands):
		As of March 31, 2014
		Adjusted Cost			Unrealized Gains				Unrealized Losses			Total Fair Value		Fair Value of
														Investments in
														Unrealized
														Loss Position
	Money market funds	$	26,028		$	-			$	-		$	26,028	$	-
	U.S. treasuries and government agency bonds		139,743			32				(25	)		139,750		34,000
	Auction-rate securities backed by student-loan notes		10,220			-				(377	)		9,843		9,843
		$	175,991		$	32			$	(402	)	$	175,621	$	43,843
		As of December 31, 2013
		Adjusted Cost			Unrealized Gains				Unrealized Losses			Total Fair Value		Fair Value of
														Investments in
														Unrealized
														Loss Position
	Money market funds	$	35,588		$	-			$	-		$	35,588	$	-
	U.S. treasuries and government agency bonds		128,123			26				(23	)		128,126		42,880
	Auction-rate securities backed by student-loan notes		10,220			-				(360	)		9,860		9,860
		$	173,931		$	26			$	(383	)	$	173,574	$	52,740
	The following table details the fair value measurement of the financial assets (in thousands):
		Fair Value Measurement at March 31, 2014
					Quoted Prices in				Significant Other			Significant
					Active Markets for				Observable Inputs			Unobservable
					Identical Assets							Inputs
		Total			Level 1				Level 2			Level 3
	Money market funds	$	26,028		$	26,028			$	-		$	-
	U.S. treasuries and government agency bonds		139,750			-				139,750			-
	Auction-rate securities backed by student-loan notes		9,843			-				-			9,843
		$	175,621		$	26,028			$	139,750		$	9,843
		Fair Value Measurement at December 31, 2013
					Quoted Prices in				Significant Other			Significant
					Active Markets for				Observable Inputs			Unobservable
					Identical Assets							Inputs
		Total			Level 1				Level 2			Level 3
	Money market funds	$	35,588		$	35,588			$	-		$	-
	U.S. treasuries and government agency bonds		128,126			-				128,126			-
	Auction-rate securities backed by student-loan notes		9,860			-				-			9,860
		$	173,574		$	35,588			$	128,126		$	9,860
The Company's level 2 assets consist of U.S. treasuries and government agency bonds. These securities generally have market prices available from multiple sources, which are used as inputs into a distribution-curve based algorithm to determine fair value.
The Company’s level 3 assets consist of government-backed student loan auction-rate securities, with interest rates that reset through a Dutch auction every 7 to 35 days and which became illiquid in 2008. The following table provides a reconciliation of the Company’s level 3 assets (in thousands):
Balance at January 1, 2014	$	9,860
Sales and settlement at par		-
Change in unrealized loss included in other comprehensive income		(17	)
Ending balance at March 31, 2014	$	9,843
As of March 31, 2014, the Company’s investment portfolio included $9.8 million in government-backed student loan auction-rate securities, net of impairment charges of $407,000, of which $377,000 was temporary and $30,000 was recorded as other-than-temporary. This compares to an investment balance as of December 31, 2013 of $9.9 million, net of impairment charges of $390,000, of which $360,000 was temporary and $30,000 was recorded as other-than-temporary.
Determining the fair value of the auction-rate securities requires significant management judgment regarding projected future cash flows which will depend on many factors, including the quality of the underlying collateral, estimated time for liquidity including potential to be called or restructured, underlying final maturity, insurance guaranty and market conditions, among others. To determine the fair value of the auction-rate securities, the Company used a discounted cash flow model with the following assumptions:
	March 31,				December 31,
	2014				2013
Time-to-liquidity (months)		24				24
Expected return		2.70%				2.50%
Discount rate	3.60%	-	8.40%		3.30%	-	8.10%
Deferred Compensation Plan:
The Company has a non-qualified, unfunded deferred compensation plan, which became effective in July 2013 and provides certain key employees, including our executive management, with the ability to defer the receipt of compensation in order to accumulate funds for retirement on a tax deferred basis. The Company does not make contributions to the plan or guarantee returns on the investments. The Company is responsible for the plan’s administrative expenses. Participant deferrals and investment gains and losses remain as the Company’s liabilities and the underlying assets are subject to claims of general creditors.
As of March 31, 2014 and December 31, 2013, the plan assets totaled $2.6 million and $0.6 million, and the plan liabilities totaled $2.6 million and $0.6 million, respectively. For the three months ended March 31, 2014, the Company recorded an income of $36,000 in interest and other income (expense), net, related to the changes in the cash surrender value of the plan assets and an operating expense of $13,000 related to the changes in the fair value of the plan liabilities.

Note_8_Income_Taxes

Note 8 - Income Taxes	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	8.   Income Taxes
	The income tax provision for the three months ended March 31, 2014 was $0.3 million, or 2.8% of the income before income taxes. This differs from the federal statutory rate primarily because the Company’s foreign income was taxed at lower rates and because of the benefit that the Company realized as a result of stock options exercises and the releases of RSUs and changes in our valuation allowance.
	The income tax benefit for the three months ended March 31, 2013 was $(0.2) million, or (8.9)% of the income before income taxes. This differs from the federal statutory rate primarily because the Company’s foreign income was taxed at lower rates and because of the benefit that the Company realized as a result of stock option exercises and releases of RSUs.
	Unrecognized Tax Benefits
	As of March 31, 2014 and December 31, 2013, the Company had unrecognized tax benefits of approximately $15.2 million and $14.9 million, respectively. As of March 31, 2014 and December 31, 2013, the Company had approximately $5.2 million and $5.0 million, respectively, of tax benefits that, if recognized, would result in an adjustment to the Company’s effective tax rate after considering the valuation allowance.
	Uncertain tax positions relate to the allocation of income and deductions among the Company’s global entities and to the determination of the research and development tax credit. The Company believes that it is reasonably possible that approximately $1.2 million of its unrecognized tax benefits may be released in 2014 as a result of a lapse of the statute of limitations. In addition, it is reasonably possible that over the next twelve-month period the Company may experience other increases or decreases in its unrecognized tax benefits. However, it is not possible to determine either the magnitude or the range of other increases or decreases at this time.
	The Company recognizes interest and penalties, if any, related to uncertain tax positions in its income tax provision. As March 31, 2014 and December 31, 2013, the Company had $0.8 million of accrued interest related to uncertain tax positions.
	Income Tax Audits
	The Company is subject to examination of its income tax returns by the IRS and other tax authorities. The Company’s U.S. Federal income tax returns for the years ended December 31, 2005 through December 31, 2007 are under examination by the IRS. In April 2011, the Company received from the IRS a Notice of Proposed Adjustment ("NOPA") relating to a cost-sharing agreement entered into by the Company and its international subsidiaries on January 1, 2004. In the NOPA, the IRS objected to the Company’s allocation of certain litigation expenses between the Company and its international subsidiaries and the amount of "buy-in payments" made by the international subsidiaries to the Company in connection with the cost-sharing agreement, and proposed to increase the Company’s U.S. taxable income according to a few alternative methodologies. In February 2012, the Company received a revised NOPA from the IRS (“Revised NOPA”). In this Revised NOPA, the IRS raised the same issues as in the NOPA issued in April 2011 but under a different methodology. Under the Revised NOPA, the largest potential federal income tax adjustment, if the IRS were to prevail on all matters in dispute, is $10.5 million, plus interest and penalties, if any. The Company responded to the IRS Revised NOPA in May 2012. In June 2013, the IRS responded and continued to disagree with the Company’s rebuttal. The Company met with the IRS Office of Appeals in March 2014. However, no resolutions were reached in the meeting, and both parties are scheduled to meet again in May 2014. Meanwhile, the Company agreed to grant the IRS an extension of the statute of limitations for taxable years 2005 through 2007 to December 31, 2014.
	The IRS also audited the research and development credits carried forward into year 2005 and the credits generated in the years 2005 through 2007. The Company received a NOPA from the IRS in February 2011, proposing to reduce the research and development credits generated in year 2005 through 2007 and the carryforwards, which would then reduce the value of such credits carried forward to subsequent tax years.
	The Company reviewed and responded to the above proposed adjustments. The Company regularly assesses the likelihood of an adverse outcome resulting from such examinations to determine the adequacy of its provision for income taxes. As of March 31, 2014, based on the technical merits of its tax return filing positions and the interactions to date with the IRS, the Company believes that it is more-likely-than-not that the resolution of the audits will not have a significant impact on the Company’s consolidated financial position, results of operations and cash flows.

Note_9_Accumulated_Other_Compr

Note 9 - Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2014
Disclosure Text Block [Abstract]	'
Comprehensive Income (Loss) Note [Text Block]	'
	9.  Accumulated Other Comprehensive Income
	The following table summarizes the changes in accumulated other comprehensive income (in thousands):
		Unrealized Losses			Unrealized Gains		Foreign Currency			Total
		on Auction-Rate			on Other Available		Translation
		Securities			-for-Sale Securities		Adjustments
	Balance as of January 1, 2014	$	(360	)	$	4	$	6,616		$	6,260
	Other comprehensive income (loss) before reclassifications		(17	)		5		(596	)		(608	)
	Amounts reclassified from accumulated other comprehensive income		-			-		-			-
	Net current period other comprehensive income (loss)		(17	)		5		(596	)		(608	)
	Balance as of March 31, 2014	$	(377	)	$	9	$	6,020		$	5,652

Note_10_Stock_Repurchase_Progr

Note 10 - Stock Repurchase Program	3 Months Ended
	Mar. 31, 2014
Disclosure Text Block [Abstract]	'
Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block]	'
	10.  Stock Repurchase Program
	In July 2013, the Board of Directors approved a stock repurchase program that authorizes the Company to repurchase up to $100 million in the aggregate of its common stock through June 30, 2015. All shares are retired upon repurchase. The following table summarizes the repurchase activities under the program:
		Shares Repurchased		Average Price Per Share		Amount Repurchased
						(in thousands)
	Cumulative balance at January 1, 2014		663,802	$	31.06	$	20,615
	Repurchases		323,789	$	35.08		11,358
	Cumulative balance at March 31, 2014		987,591	$	32.38	$	31,973
	As of March 31, 2014, $68.0 million remained available for future repurchases under the program.

Note_2_StockBased_Compensation1

Note 2 - Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2014
Note 2 - Stock-Based Compensation (Tables) [Line Items]	'
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]	'
		Three Months Ended March 31,
		2014			2013
	Cost of revenue	$	205		$	156
	Research and development		2,005			1,373
	Selling, general and administrative		5,388			3,131
	Tax benefit		-			(47	)
	Total	$	7,598		$	4,613
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	'
		Time-Based			Weighted-			PSUs			Weighted-		MSUs		Weighted-		Total			Weighted-
		RSUs			Average Grant						Average Grant				Average Grant					Average Grant
					Date Fair						Date Fair				Date Fair					Date Fair
					Value Per						Value Per				Value Per					Value Per
					Share						Share				Share					Share
	Outstanding at January 1, 2014		754,306		$	19.41			1,027,782		$	23.02		1,800,000	$	23.57		3,582,088		$	22.53
	Awards granted (1)		120,135		$	32.06			756,684		$	31.58		-	$	-		876,819		$	31.65
	Performance adjustment (2)		-		$	-			(155,255	)	$	29.65		-	$	-		(155,255	)	$	29.65
	Awards released		(145,524	)	$	18.97			(165,136	)	$	17.76		-	$	-		(310,660	)	$	18.33
	Awards forfeited		(3,892	)	$	18.39			-		$	-		-	$	-		(3,892	)	$	18.39
	Outstanding at March 31, 2014		725,025		$	21.6			1,464,075		$	27.33		1,800,000	$	23.57		3,989,100		$	24.59
Employee Stock Purchase Program [Member]	'
Note 2 - Stock-Based Compensation (Tables) [Line Items]	'
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	'
		Three Months Ended March 31,
		2014			2013
	Expected term (years)		0.5			0.5
	Expected volatility		33.9	%		28.5	%
	Risk-free interest rate		0.1	%		0.1	%
	Dividend yield		-			-
Plan Status [Member]	'
Note 2 - Stock-Based Compensation (Tables) [Line Items]	'
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	'
		Stock Options			Weighted-Average			Weighted-Average			Aggregate Intrinsic
					Exercise Price			Remaining			Value
								Contractual Term
								(Years)
	Outstanding at January 1, 2014		1,356,446		$	15.86			1.9		$	25,505,753
	Options exercised		(350,920	)	$	15.83			-		$	-
	Options forfeited and expired		(1,167	)	$	11.48			-		$	-
	Outstanding at March 31, 2014		1,004,359		$	15.87			1.7		$	22,998,787
	Options exercisable at March 31, 2014 and expected to vest		1,002,281		$	15.88			1.7		$	22,942,298
	Options exercisable at March 31, 2014		942,757		$	16.01			1.5		$	21,459,665

Note_3_Balance_Sheet_Component1

Note 3 - Balance Sheet Components (Tables)	3 Months Ended
	Mar. 31, 2014
Disclosure Text Block Supplement [Abstract]	'
Schedule of Inventory, Current [Table Text Block]	'
		March 31,			December 31,
		2014			2013
	Work in process	$	24,874		$	26,605
	Finished goods		14,955			13,132
	Total inventories	$	39,829		$	39,737
Schedule of Other Assets, Noncurrent [Table Text Block]	'
		March 31,			December 31,
		2014			2013
	Deferred compensation plan assets	$	2,570		$	607
	Prepaid expense		1,632			57
	Other		957			980
	Total other long-term assets	$	5,159		$	1,644
Schedule of Accrued Liabilities [Table Text Block]	'
		March 31,			December 31,
		2014			2013
	Proceeds from litigation (see Note 6)	$	-		$	9,489
	Deferred revenue and customer prepayments		2,940			2,523
	Stock rotation reserve		1,779			1,459
	Sales rebate		1,072			900
	Commissions		786			931
	Warranty		334			451
	Other		1,648			1,623
	Total accrued liabilities	$	8,559		$	17,376
Schedule of Product Warranty Liability [Table Text Block]	'
		Three Months Ended March 31,
		2014			2013
	Balance at beginning of period	$	451		$	331
	Warranty provision for product sales		60			103
	Settlements made		(74	)		(93	)
	Unused warranty provision		(103	)		(66	)
	Balance at end of period	$	334		$	275
Schedule of Other Assets and Other Liabilities [Table Text Block]	'
		March 31,			December 31,
		2014			2013
	Deferred compensation plan liabilities	$	2,567		$	628
	Other		1,107			850
	Total other long-term liabilities	$	3,674		$	1,478

Note_4_Net_Income_Per_Share_Ta

Note 4 - Net Income Per Share (Tables)	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	'
		Three Months Ended March 31,
		2014		2013
	Numerator:
	Net income	$	9,018	$	2,499
	Denominator:
	Weighted average outstanding shares used to compute basic net income per share		38,470		36,259
	Effect of dilutive securities		1,047		1,449
	Weighted average outstanding shares used to compute diluted net income per share		39,517		37,708
	Net income per share - basic	$	0.23	$	0.07
	Net income per share - diluted	$	0.23	$	0.07

Note_5_Segment_Information_Tab

Note 5 - Segment Information (Tables)	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	'
		Three Months Ended March 31,
	Customer	2014			2013
	A		26	%		34	%
	B		10	%		*
Schedule of Accounts Receivable by Major Customers [Table Text Block]	'
	Customer	March 31,			December 31,
		2014			2013
	A		24	%		32	%
	B		16	%		17	%
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	'
		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
Revenue from External Customers by Products and Services [Table Text Block]	'
		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
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	'
	Country	March 31,			December 31,
		2014			2013
	China	$	39,093		$	41,557
	United States		31,753			24,719
	Other		210			205
	Total	$	71,056		$	66,481

Note_7_Cash_Cash_Equivalents_a1

Note 7 - Cash, Cash Equivalents and Investments (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair Value, by Balance Sheet Grouping [Table Text Block]	'
		Estimated Fair Market Value as of
		March 31,			December 31,
		2014			2013
	Cash, cash equivalents and investments:
	Cash	$	62,857		$	62,625
	Money market funds		26,028			35,588
	U.S. treasuries and government agency bonds		139,750			128,126
	Auction-rate securities backed by student-loan notes		9,843			9,860
	Total cash, cash equivalents and investments	$	238,478		$	236,199
Schedule of Other Current Assets [Table Text Block]	'
	Reported as:	March 31,			December 31,
		2014			2013
	Cash and cash equivalents	$	88,885		$	101,213
	Short-term investments		139,750			125,126
	Long-term investments		9,843			9,860
	Total cash, cash equivalents and investments	$	238,478		$	236,199
Investments Classified by Contractual Maturity Date [Table Text Block]	'
		March 31,			December 31,
		2014			2013
	Due in less than 1 year	$	89,651		$	95,509
	Due in 1 - 5 years		50,099			29,617
	Due in greater than 5 years		9,843			9,860
		$	149,593		$	134,986
Unrealized Gain (Loss) on Investments [Table Text Block]	'
		As of March 31, 2014
		Adjusted Cost			Unrealized Gains				Unrealized Losses			Total Fair Value		Fair Value of
														Investments in
														Unrealized
														Loss Position
	Money market funds	$	26,028		$	-			$	-		$	26,028	$	-
	U.S. treasuries and government agency bonds		139,743			32				(25	)		139,750		34,000
	Auction-rate securities backed by student-loan notes		10,220			-				(377	)		9,843		9,843
		$	175,991		$	32			$	(402	)	$	175,621	$	43,843
		As of December 31, 2013
		Adjusted Cost			Unrealized Gains				Unrealized Losses			Total Fair Value		Fair Value of
														Investments in
														Unrealized
														Loss Position
	Money market funds	$	35,588		$	-			$	-		$	35,588	$	-
	U.S. treasuries and government agency bonds		128,123			26				(23	)		128,126		42,880
	Auction-rate securities backed by student-loan notes		10,220			-				(360	)		9,860		9,860
		$	173,931		$	26			$	(383	)	$	173,574	$	52,740
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	'
		Fair Value Measurement at March 31, 2014
					Quoted Prices in				Significant Other			Significant
					Active Markets for				Observable Inputs			Unobservable
					Identical Assets							Inputs
		Total			Level 1				Level 2			Level 3
	Money market funds	$	26,028		$	26,028			$	-		$	-
	U.S. treasuries and government agency bonds		139,750			-				139,750			-
	Auction-rate securities backed by student-loan notes		9,843			-				-			9,843
		$	175,621		$	26,028			$	139,750		$	9,843
		Fair Value Measurement at December 31, 2013
					Quoted Prices in				Significant Other			Significant
					Active Markets for				Observable Inputs			Unobservable
					Identical Assets							Inputs
		Total			Level 1				Level 2			Level 3
	Money market funds	$	35,588		$	35,588			$	-		$	-
	U.S. treasuries and government agency bonds		128,126			-				128,126			-
	Auction-rate securities backed by student-loan notes		9,860			-				-			9,860
		$	173,574		$	35,588			$	128,126		$	9,860
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	'
	Balance at January 1, 2014	$	9,860
	Sales and settlement at par		-
	Change in unrealized loss included in other comprehensive income		(17	)
	Ending balance at March 31, 2014	$	9,843
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	'
		March 31,				December 31,
		2014				2013
	Time-to-liquidity (months)		24				24
	Expected return		2.70%				2.50%
	Discount rate	3.60%	-	8.40%		3.30%	-	8.10%

Note_9_Accumulated_Other_Compr1

Note 9 - Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2014
Disclosure Text Block [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
		Unrealized Losses			Unrealized Gains		Foreign Currency			Total
		on Auction-Rate			on Other Available		Translation
		Securities			-for-Sale Securities		Adjustments
	Balance as of January 1, 2014	$	(360	)	$	4	$	6,616		$	6,260
	Other comprehensive income (loss) before reclassifications		(17	)		5		(596	)		(608	)
	Amounts reclassified from accumulated other comprehensive income		-			-		-			-
	Net current period other comprehensive income (loss)		(17	)		5		(596	)		(608	)
	Balance as of March 31, 2014	$	(377	)	$	9	$	6,020		$	5,652

Note_10_Stock_Repurchase_Progr1

Note 10 - Stock Repurchase Program (Tables)	3 Months Ended
	Mar. 31, 2014
Disclosure Text Block [Abstract]	'
Schedule of Repurchase Agreements [Table Text Block]	'
		Shares Repurchased		Average Price Per Share		Amount Repurchased
						(in thousands)
	Cumulative balance at January 1, 2014		663,802	$	31.06	$	20,615
	Repurchases		323,789	$	35.08		11,358
	Cumulative balance at March 31, 2014		987,591	$	32.38	$	31,973

Note_2_StockBased_Compensation2

Note 2 - Stock-Based Compensation (Details) (USD $)

3 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Apr. 30, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Feb. 28, 2014

Feb. 28, 2014

Feb. 28, 2014

Mar. 31, 2014

Feb. 28, 2014

Mar. 31, 2014

Feb. 28, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2013

2014 Plan [Member]

Time-Based RSU's and PSUs [Member]

Time-Based RSU's and PSUs [Member]

Time-Based RSUs, PSUs, MSUs [Member]

2013 Time-Based RSUs and PSUs [Member]

Time-Based RSUs [Member]

Time-Based RSUs [Member]

Time-Based RSUs [Member]

PSUs [Member]

PSUs [Member]

2012 Time-Based RSUs and PSUs [Member]

2004 Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Executive Officer [Member]

Executive Officer [Member]

Non-Executive Employees [Member]

Executive Officer [Member]

Executive Officer [Member]

Note 2 - Stock-Based Compensation (Details) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock, Capital Shares Reserved for Future Issuance (in Shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

2,900,000

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)

'

'

5,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested

'

'

'

$10,200,000

$8,700,000

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding

'

'

'

'

'

154,700,000

'

'

'

'

'

'

'

'

'

'

Share Price (in Dollars per share)

$38.77

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized

400,000

'

'

'

'

61,200,000

'

'

'

'

'

'

'

'

'

200,000

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition

'1 year

'

'

'

'

'6 years

'

'

'

'

'

'

'

'

'5 months

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)

876,819

[1]

'

'

'

'

'

336,000

'

'

120,135

[1]

'

756,684

[1]

'

'

'

'

Percentage Of Time Based RSUs

'

'

'

'

'

'

'

'

25.00%

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

'

'

'

'

'

'

'

'2 years

'

'

'2 years

'

'

'

'

'

Percentage Of Time Based PSU

'

'

'

'

'

'

'

'

'

'

75.00%

'

'

'

'

'

Share Based Compensation Share Based Payment Other Than Options Percentage Allowed

'

'

'

'

'

'

'

'

'

'

'

'

300.00%

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value

6,900,000

5,600,000

'

'

'

'

'

'

'

'

'

'

'

'

0.5

'

Proceeds from Stock Options Exercised

5,600,000

9,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

43,000

65,000

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,800,000

'

Proceeds from Stock Plans

$1,053,000

$1,167,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

The number of PSUs granted reflects the maximum number of shares that can ultimately be earned assuming the achievement of the highest level of performance conditions under the programs.

Note_2_StockBased_Compensation3

Note 2 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Note 2 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses [Line Items]	'	'
Total	$7,598	$4,613
Cost of Sales [Member]	'	'
Note 2 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses [Line Items]	'	'
Allocated share-based compensation expense	205	156
Research and Development Expense [Member]	'	'
Note 2 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses [Line Items]	'	'
Allocated share-based compensation expense	2,005	1,373
Selling, General and Administrative Expenses [Member]	'	'
Note 2 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses [Line Items]	'	'
Allocated share-based compensation expense	5,388	3,131
Tax Benefit [Member]	'	'
Note 2 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses [Line Items]	'	'
Allocated share-based compensation expense	'	($47)

Note_2_StockBased_Compensation4

Note 2 - Stock-Based Compensation (Details) - RSU Summary (USD $)	3 Months Ended
	Mar. 31, 2014
Note 2 - Stock-Based Compensation (Details) - RSU Summary [Line Items]	'
Outstanding at	3,582,088
Outstanding at	$22.53
Awards granted (1)	876,819	[1]
Awards granted (1)	$31.65	[1]
Performance adjustment (2)	-155,255	[2]
Performance adjustment (2)	$29.65	[2]
Awards released	-310,660
Awards released	$18.33
Awards forfeited	-3,892
Awards forfeited	$18.39
Outstanding at	3,989,100
Outstanding at	$24.59
Time-Based RSUs [Member]	'
Note 2 - Stock-Based Compensation (Details) - RSU Summary [Line Items]	'
Outstanding at	754,306
Outstanding at	$19.41
Awards granted (1)	120,135	[1]
Awards granted (1)	$32.06	[1]
Performance adjustment (2)	'	[2]
Performance adjustment (2)	'	[2]
Awards released	-145,524
Awards released	$18.97
Awards forfeited	-3,892
Awards forfeited	$18.39
Outstanding at	725,025
Outstanding at	$21.60
PSUs [Member]	'
Note 2 - Stock-Based Compensation (Details) - RSU Summary [Line Items]	'
Outstanding at	1,027,782
Outstanding at	$23.02
Awards granted (1)	756,684	[1]
Awards granted (1)	$31.58	[1]
Performance adjustment (2)	-155,255	[2]
Performance adjustment (2)	$29.65	[2]
Awards released	-165,136
Awards released	$17.76
Outstanding at	1,464,075
Outstanding at	$27.33
MSUs [Member]	'
Note 2 - Stock-Based Compensation (Details) - RSU Summary [Line Items]	'
Outstanding at	1,800,000
Outstanding at	$23.57
Awards granted (1)	'	[1]
Awards granted (1)	'	[1]
Performance adjustment (2)	'	[2]
Performance adjustment (2)	'	[2]
Outstanding at	1,800,000
Outstanding at	$23.57
[1]	The number of PSUs granted reflects the maximum number of shares that can ultimately be earned assuming the achievement of the highest level of performance conditions under the programs.
[2]	The performance adjustment reflects the number of PSUs that have not been earned or will not ultimately be earned based on management's probability assessment.

Note_2_StockBased_Compensation5

Note 2 - Stock-Based Compensation (Details) - Stock Options (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Stock Options [Abstract]	'	'
Stock Options Outstanding	'	1,356,446
Weighted Average Exercise Price	'	$15.86
Weighted-Average Remaining Contractual Term (Years)	'1 year 255 days	'1 year 328 days
Aggregate Intrinsic Value	'	$25,505,753
Options exercisable at March 31, 2014 and expected to vest	1,002,281	'
Options exercisable at March 31, 2014 and expected to vest	$15.88	'
Options exercisable at March 31, 2014 and expected to vest	'1 year 255 days	'
Options exercisable at March 31, 2014 and expected to vest	22,942,298	'
Options exercisable at March 31, 2014	942,757	'
Options exercisable at March 31, 2014	$16.01	'
Options exercisable at March 31, 2014	'1 year 6 months	'
Options exercisable at March 31, 2014	21,459,665	'
Options exercised	-350,920	'
Options exercised	$15.83	'
Options forfeited and expired	-1,167	'
Options forfeited and expired	$11.48	'
Stock Options Outstanding	1,004,359	'
Weighted Average Exercise Price	$15.87	'
Aggregate Intrinsic Value	$22,998,787	'

Note_2_StockBased_Compensation6

Note 2 - Stock-Based Compensation (Details) - Valuation Assumptions, Stock Purchase Rights (Employee Stock Purchase Plan [Member])	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Employee Stock Purchase Plan [Member]	'	'
Note 2 - Stock-Based Compensation (Details) - Valuation Assumptions, Stock Purchase Rights [Line Items]	'	'
Expected term (years)	'6 months	'6 months
Expected volatility	33.90%	28.50%
Risk-free interest rate	0.10%	0.10%

Note_3_Balance_Sheet_Component2

Note 3 - Balance Sheet Components (Details) - Inventories (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventories [Abstract]	'	'
Work in process	$24,874	$26,605
Finished goods	14,955	13,132
Total inventories	$39,829	$39,737

Note_3_Balance_Sheet_Component3

Note 3 - Balance Sheet Components (Details) - Other Long-Term Assets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other Long-Term Assets [Abstract]	'	'
Deferred compensation plan assets	$2,570	$607
Prepaid expense	1,632	57
Other	957	980
Total other long-term assets	$5,159	$1,644

Note_3_Balance_Sheet_Component4

Note 3 - Balance Sheet Components (Details) - Accrued Liabilities (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]	'	'
Accrued Liabilities	$8,559	$17,376
Proceeds From Litigation [Member]	'	'
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]	'	'
Accrued Liabilities	'	9,489
Deferred Revenue And Customer Prepayments [Member]	'	'
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]	'	'
Accrued Liabilities	2,940	2,523
Stock Rotation Reserve [Member]	'	'
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]	'	'
Accrued Liabilities	1,779	1,459
Sales Rebate [Member]	'	'
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]	'	'
Accrued Liabilities	1,072	900
Commissions [Member]	'	'
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]	'	'
Accrued Liabilities	786	931
Warranty [Member]	'	'
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]	'	'
Accrued Liabilities	334	451
Other Liability [Member]	'	'
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]	'	'
Accrued Liabilities	$1,648	$1,623

Note_3_Balance_Sheet_Component5

Note 3 - Balance Sheet Components (Details) - Roll-Forward of the Warranty Reserve (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Roll-Forward of the Warranty Reserve [Abstract]	'	'
Balance at beginning of period	$451	$331
Warranty provision for product sales	60	103
Settlements made	-74	-93
Unused warranty provision	-103	-66
Balance at end of period	$334	$275

Note_3_Balance_Sheet_Component6

Note 3 - Balance Sheet Components (Details) - Llong-Term Liabilities (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Llong-Term Liabilities [Abstract]	'	'
Deferred compensation plan liabilities	$2,567	$628
Other	1,107	850
Total other long-term liabilities	$3,674	$1,478

Note_4_Net_Income_Per_Share_De

Note 4 - Net Income Per Share (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
		Common Stock Equivalents [Member]
Note 4 - Net Income Per Share (Details) [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	200,000

Note_4_Net_Income_Per_Share_De1

Note 4 - Net Income Per Share (Details) - Net Income Per Share Basic And Diluted (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net Income Per Share Basic And Diluted [Abstract]	'	'
Net income (in Dollars)	$9,018	$2,499
Weighted average outstanding shares used to compute basic net income per share	38,470	36,259
Effect of dilutive securities	1,047	1,449
Weighted average outstanding shares used to compute diluted net income per share	39,517	37,708
Net income per share - basic (in Dollars per share)	$0.23	$0.07
Net income per share - diluted (in Dollars per share)	$0.23	$0.07

Note_5_Segment_Information_Det

Note 5 - Segment Information (Details)	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Number of Reportable Segments	1

Note_5_Segment_Information_Det1

Note 5 - Segment Information (Details) - Customers with Sales Greater than 10% (Customer Concentration Risk [Member], Sales Revenue, Net [Member])	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Customer A [Member]	'	'
Revenue, Major Customer [Line Items]	'	'
Customers	26.00%	34.00%
Customer B [Member]	'	'
Revenue, Major Customer [Line Items]	'	'
Customers	10.00%	'	[1]
[1]	Represents less than 10%.

Note_5_Segment_Information_Det2

Note 5 - Segment Information (Details) - Distributors with Accounts Receivables Greater than 10% (Customer Concentration Risk [Member], Accounts Receivable [Member])	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Customer A [Member]	'	'
Note 5 - Segment Information (Details) - Distributors with Accounts Receivables Greater than 10% [Line Items]	'	'
Major Customer	24.00%	32.00%
Customer B [Member]	'	'
Note 5 - Segment Information (Details) - Distributors with Accounts Receivables Greater than 10% [Line Items]	'	'
Major Customer	16.00%	17.00%

Note_5_Segment_Information_Det3

Note 5 - Segment Information (Details) - Revenue By Region (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]	'	'
Revenue By Region	$60,061	$51,470
CHINA	'	'
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]	'	'
Revenue By Region	36,859	26,779
TAIWAN, PROVINCE OF CHINA	'	'
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]	'	'
Revenue By Region	9,064	7,519
Europe [Member]	'	'
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]	'	'
Revenue By Region	4,591	3,950
KOREA, REPUBLIC OF	'	'
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]	'	'
Revenue By Region	2,736	2,418
UNITED STATES	'	'
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]	'	'
Revenue By Region	2,603	1,901
JAPAN	'	'
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]	'	'
Revenue By Region	2,141	1,521
South East Asia [Member]	'	'
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]	'	'
Revenue By Region	2,013	7,329
Other Region [Member]	'	'
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]	'	'
Revenue By Region	$54	$53

Note_5_Segment_Information_Det4

Note 5 - Segment Information (Details) - Revenue By Product Family (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue from External Customer [Line Items]	'	'
Revenue by product family	$60,061	$51,470
DC To DC Converters [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Revenue by product family	53,935	46,442
Lighting Control Products [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Revenue by product family	$6,126	$5,028

Note_5_Segment_Information_Det5

Note 5 - Segment Information (Details) - Long Lived Assets By Geographic Region (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Note 5 - Segment Information (Details) - Long Lived Assets By Geographic Region [Line Items]	'	'
Long Lived Assets	$71,056	$66,481
CHINA	'	'
Note 5 - Segment Information (Details) - Long Lived Assets By Geographic Region [Line Items]	'	'
Long Lived Assets	39,093	41,557
UNITED STATES	'	'
Note 5 - Segment Information (Details) - Long Lived Assets By Geographic Region [Line Items]	'	'
Long Lived Assets	31,753	24,719
Other Region [Member]	'	'
Note 5 - Segment Information (Details) - Long Lived Assets By Geographic Region [Line Items]	'	'
Long Lived Assets	$210	$205

Note_6_Litigation_Details

Note 6 - Litigation (Details) (O2 Micro [Member], USD $)	30-May-12	30-May-12	Mar. 31, 2014	Nov. 30, 2013	Dec. 31, 2013
	Attorney Fees [Member]	Taxable Costs [Member]
Note 6 - Litigation (Details) [Line Items]	'	'	'	'	'
Gain Contingency, Unrecorded Amount	$9,100,000	$300,000	'	'	'
Proceeds from Legal Settlements	'	'	'	9,500,000	'
Loss Contingency, Estimate of Possible Loss	'	'	'	'	9,500,000
Litigation Benefit, Net	'	'	9,500,000	'	'
Litigation Settlement, Expense	'	'	$500,000	'	'

Note_7_Cash_Cash_Equivalents_a2

Note 7 - Cash, Cash Equivalents and Investments (Details) (USD $)

3 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Temporary [Member]

Temporary [Member]

Other Than Temporary [Member]

Other Than Temporary [Member]

Government Backed Securities [Member]

Government Backed Securities [Member]

Auction Rate [Member]

Auction Rate Securities Backed By Student-Loan Notes [Member]

Government Backed Securities [Member]

Government Backed Securities [Member]

Note 7 - Cash, Cash Equivalents and Investments (Details) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Auction Rate Securities, Noncurrent

$9,843,000

$9,860,000

$9,860,000

'

'

'

'

$0

$25,000

'

'

$9,800,000

$9,900,000

Other than Temporary Impairment Losses, Investments

'

'

'

377,000

360,000

30,000

30,000

'

'

390,000

407,000

'

'

Deferred Compensation Plan Assets

2,570,000

607,000

'

'

'

'

'

'

'

'

'

'

'

Deferred Compensation Liability, Current and Noncurrent

2,600,000

600,000

'

'

'

'

'

'

'

'

'

'

'

Deferred Compensation Plan Assets Change in Fair Value Expense

36,000

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Compensation Plan Liabilities, Operating Expense

$13,000

'

'

'

'

'

'

'

'

'

'

'

'

Note_7_Cash_Cash_Equivalents_a3

Note 7 - Cash, Cash Equivalents and Investments (Details) - Current Assets Fair Market Value (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash	$62,857	$62,625
Money market funds	26,028	35,588
U.S. treasuries and government agency bonds	139,750	128,126
Total cash, cash equivalents and investments	238,478	236,199
Auction Rate Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Auction-rate securities backed by student-loan notes	$9,843	$9,860

Note_7_Cash_Cash_Equivalents_a4

Note 7 - Cash, Cash Equivalents and Investments (Details) - Current Assets Reported As (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current Assets Reported As [Abstract]	'	'	'	'
Cash and cash equivalents	$88,885	$101,213	$93,287	$75,104
Short-term investments	139,750	125,126	'	'
Long-term investments	9,843	9,860	'	'
Total cash, cash equivalents and investments	$238,478	$236,199	'	'

Note_7_Cash_Cash_Equivalents_a5

Note 7 - Cash, Cash Equivalents and Investments (Details) - Investment Maturity Classification (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment Maturity Classification [Abstract]	'	'
Due in less than 1 year	$89,651	$95,509
Due in 1 - 5 years	50,099	29,617
Due in greater than 5 years	9,843	9,860
	$149,593	$134,986

Note_7_Cash_Cash_Equivalents_a6

Note 7 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Note 7 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items]	'	'
Adjusted Cost	$175,991	$173,931
Unrealized Gains	32	26
Unrealized Losses	-402	-383
Total Fair Value	175,621	173,574
Fair Value of Investments in Unrealized Loss Position	43,843	52,740
Money Market Funds [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items]	'	'
Adjusted Cost	26,028	35,588
Unrealized Gains	0	0
Total Fair Value	26,028	35,588
US Government Agencies Short-term Debt Securities [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items]	'	'
Adjusted Cost	139,743	128,123
Unrealized Gains	32	26
Unrealized Losses	-25	-23
Total Fair Value	139,750	128,126
Fair Value of Investments in Unrealized Loss Position	34,000	42,880
Auction Rate Securities [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items]	'	'
Adjusted Cost	10,220	10,220
Unrealized Losses	-377	-360
Total Fair Value	9,843	9,860
Fair Value of Investments in Unrealized Loss Position	$9,843	$9,860

Note_7_Cash_Cash_Equivalents_a7

Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	$175,621	$173,574
Fair Value, Inputs, Level 1 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	26,028	35,588
Fair Value, Inputs, Level 2 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	139,750	128,126
Fair Value, Inputs, Level 3 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	9,843	9,860
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	26,028	35,588
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	0	0
Money Market Funds [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	26,028	35,588
US Government Agencies Short-term Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	0	0
US Government Agencies Short-term Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	139,750	128,126
US Government Agencies Short-term Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	0	0
US Government Agencies Short-term Debt Securities [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	139,750	128,126
Auction Rate Securities [Member] | Fair Value, Inputs, Level 1 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	0	0
Auction Rate Securities [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	0	0
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	9,843	9,860
Auction Rate Securities [Member]	'	'
Note 7 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items]	'	'
Available For Sale Securities	$9,843	$9,860

Note_7_Cash_Cash_Equivalents_a8

Note 7 - Cash, Cash Equivalents and Investments (Details) - Level 3 Investments (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2012
Level 3 Investments [Abstract]	'	'
Balance	$9,860	$9,860
Change in unrealized loss included in other comprehensive income	-17	'
Balance	$9,843	$9,860

Note_7_Cash_Cash_Equivalents_a9

Note 7 - Cash, Cash Equivalents and Investments (Details) - Discounted Cash Flow Model Values	Mar. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]	'	'
Time-to-liquidity (months)	24	24
Expected return	2.70%	2.50%
Minimum [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Discount rate	3.60%	3.30%
Maximum [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Discount rate	8.40%	8.10%

Note_8_Income_Taxes_Details

Note 8 - Income Taxes (Details) (USD $)	3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014	Apr. 30, 2011
				Scenario, Forecast [Member]	Minimum [Member]
Note 8 - Income Taxes (Details) [Line Items]	'	'	'	'	'
Income Tax Expense (Benefit)	$257,000	($204,000)	'	'	'
Effective Income Tax Rate Reconciliation, Percent	2.80%	-8.90%	'	'	'
Unrecognized Tax Benefits	15,200,000	'	14,900,000	'	'
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	5,200,000	'	5,000,000	'	'
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	'	'	'	1,200,000	'
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	800,000	'	800,000	'	'
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	'	'	'	'	$10,500,000

Note_9_Accumulated_Other_Compr2

Note 9 - Accumulated Other Comprehensive Income (Details) - Accumulated Balances of Other Comprehensive Income (USD $)	3 Months Ended				3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2013
			Available-for-sale Securities [Member]	Available-for-sale Securities [Member]	Auction Rate Securities [Member]	Auction Rate Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'	'	'
Unrealized Gain (Loss) on Securities	'	'	'	$4	'	($360)
Foreign Currency Translation Adjustments	'	6,616	'	'	'	'
Total	6,260	6,260	'	'	'	'
Other comprehensive income (loss) before reclassifications	'	'	5	'	-17	'
Other comprehensive income (loss) before reclassifications	-596	'	'	'	'	'
Other comprehensive income (loss) before reclassifications	-608	'	'	'	'	'
Net current period other comprehensive income (loss)	-17	'	5	'	-17	-15
Net current period other comprehensive income (loss)	-596	'	'	'	'	'
Net current period other comprehensive income (loss)	-608	281	'	'	'	'
Unrealized Gain (Loss) on Securities	'	'	9	4	-377	'
Foreign Currency Translation Adjustments	6,020	'	'	'	'	'
Total	$5,652	'	'	'	'	'

Note_10_Stock_Repurchase_Progr2

Note 10 - Stock Repurchase Program (Details) (USD $)	1 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Jul. 31, 2013	Mar. 31, 2014
Disclosure Text Block [Abstract]	'	'
Stock Repurchase Program, Authorized Amount	$100	'
Stock Repurchase Program, Remaining Authorized Repurchase Amount	'	$68

Note_10_Stock_Repurchase_Progr3

Note 10 - Stock Repurchase Program (Details) - Stock Repurchase Program (USD $)	3 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Stock Repurchase Program [Abstract]	'	'
Shares Repurchased	'	663,802
Average Price Per Share	$32.38	$31.06
Amount Repurchased	'	$20,615
Repurchases	323,789	'
Repurchases	$35.08	'
Repurchases	11,358	'
Shares Repurchased	987,591	'
Average Price Per Share	$32.38	$31.06
Amount Repurchased	$31,973	'