PDF Solutions (PDFS) 10-K 3 Mar 15 2014 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 25, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	PDF SOLUTIONS INC
Document Type	10-K
Current Fiscal Year End Date	-19
Entity Common Stock, Shares Outstanding		31,539,822
Entity Public Float			$560,000,000
Amendment Flag	FALSE
Entity Central Index Key	1120914
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-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$115,464,000	$89,371,000
Accounts receivable, net of allowances of $381 and $354, respectively	37,725,000	34,860,000
Deferred tax assets - current portion	3,343,000	5,920,000
Prepaid expenses and other current assets	2,888,000	3,632,000
Total current assets	159,420,000	133,783,000
Property and equipment, net	8,832,000	7,064,000
Intangible assets, net	0	31,000
Deferred tax assets - long-term portion	8,025,000	8,599,000
Other non-current assets	1,161,000	1,687,000
Total assets	177,438,000	151,164,000
Current liabilities:
Accounts payable	803,000	1,129,000
Accrued compensation and related benefits	6,112,000	7,707,000
Accrued and other current liabilities	1,733,000	1,593,000
Deferred revenues - current portion	3,740,000	2,096,000
Billings in excess of recognized revenues		343,000
Total current liabilities	12,388,000	12,868,000
Long-term income taxes payable	2,600,000	2,956,000
Other non-current liabilities	627,000	628,000
Total liabilities	15,615,000	16,452,000
Commitments and contingencies (Note 5)
Stockholders’ equity:
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.00015 par value, 70,000 shares authorized; shares issued 36,258 and 35,285, respectively; shares outstanding 31,116 and 30,437, respectively	5,000	5,000
Additional paid-in capital	248,734,000	233,813,000
Treasury stock, at cost, 5,142 and 4,848 shares, respectively	-34,048,000	-28,905,000
Accumulated deficit	-52,187,000	-70,649,000
Accumulated other comprehensive income	-681,000	448,000
Total stockholders’ equity	161,823,000	134,712,000
Total liabilities and stockholders’ equity	$177,438,000	$151,164,000

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Per Share data, unless otherwise specified
Accounts receivable, allowance (in Dollars)	$381	$354
Preferred stock, par value (in Dollars per share)	$0.00	$0.00
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in Dollars per share)	$0.00	$0.00
Common stock, shares authorized	70,000	70,000
Common stock, shares issued	36,258	35,285
Common stock, shares outstanding	31,116	30,437
Treasury stock shares	5,142	4,848

Consolidated_Statements_of_Ope

Consolidated Statements of Operations and Comprehensive Income (USD $)	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Design-to-silicon-yield solutions	$52,769,000	$61,710,000	$59,061,000
Gainshare performance incentives	47,394,000	39,743,000	30,479,000
Total revenues	100,163,000	101,453,000	89,540,000
Cost of Design-to-silicon-yield solutions:
Direct costs of Design-to-silicon-yield solutions	37,822,000	39,470,000	36,236,000
Impairment of deferred cost	1,892,000
Amortization of acquired technology			261,000
Total cost of Design-to-silicon-yield solutions	39,714,000	39,470,000	36,497,000
Gross profit	60,449,000	61,983,000	53,043,000
Operating expenses:
Research and development	14,064,000	13,314,000	13,251,000
Selling, general and administrative	18,457,000	17,025,000	18,599,000
Amortization of other acquired intangible assets	31,000	74,000	174,000
Restructuring charges	57,000	197,000	1,889,000
Total operating expenses	32,609,000	30,610,000	33,913,000
Income from operations	27,840,000	31,373,000	19,130,000
Interest and other income (expense), net	119,000	-64,000	-248,000
Income before taxes	27,959,000	31,309,000	18,882,000
Income tax provision (benefit)	9,497,000	10,380,000	-18,329,000
Net income	18,462,000	20,929,000	37,211,000
Other comprehensive income:
Foreign currency translation adjustments, net of tax	-1,129,000	397,000	134,000
Reclassification adjustment for other-than-temporary impairment on auction-rate-securities recognized in earnings, net of tax			216,000
Net income per share
Basic (in Dollars per share)	$0.60	$0.70	$1.30
Diluted (in Dollars per share)	$0.58	$0.67	$1.25
Weighted average common shares
Basic (in Shares)	30,743	29,826	28,700
Diluted (in Shares)	31,939	31,393	29,809
Net income	18,462,000	20,929,000	37,211,000
Other comprehensive income:
Foreign currency translation adjustments, net of tax	-1,129,000	397,000	134,000
Reclassification adjustment for other-than-temporary impairment on auction-rate-securities recognized in earnings, net of tax			216,000
Comprehensive income	$17,333,000	$21,326,000	$37,561,000

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholdersb Equity (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
In Thousands, except Share data
Balances, at Dec. 31, 2011	$4	$208,826	($22,899)	($128,789)	($299)	$56,843
Balances, (in Shares) at Dec. 31, 2011	28,304,000		4,331,000
Issuance of common stock in connection with employee stock purchase plan		978				978
Issuance of common stock in connection with employee stock purchase plan (in Shares)	201,000					201,000
Issuance of common stock in connection with exercise of options		5,528				5,528
Issuance of common stock in connection with exercise of options (in Shares)	1,019,000					1,019,000
Vesting of restricted stock units (in Shares)	172,000
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			-511			-511
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in Shares)	-45,000		45,000
Purchases of treasury stock			-4,368			-4,368
Purchases of treasury stock (in Shares)	-425,000		425,000
Stock-based compensation expense		4,880				4,880
Tax benefit from employee stock plans		149				149
Comprehensive income				37,211	350	37,561
Balances, at Dec. 31, 2012	4	220,361	-27,778	-91,578	51	101,060
Balances, (in Shares) at Dec. 31, 2012	29,226,000		4,801,000
Issuance of common stock in connection with employee stock purchase plan		1,317				1,317
Issuance of common stock in connection with employee stock purchase plan (in Shares)	184,000					184,000
Issuance of common stock in connection with exercise of options	1	5,338				5,339
Issuance of common stock in connection with exercise of options (in Shares)	871,000					871,000
Vesting of restricted stock units (in Shares)	217,000
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			-1,283			-1,283
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in Shares)	-61,000		61,000
Issuance of treasury stock		-156	156
Issuance of treasury stock (in Shares)			-14,000
Stock-based compensation expense		6,591				6,591
Tax benefit from employee stock plans		362				362
Comprehensive income				20,929	397	21,326
Balances, at Dec. 31, 2013	5	233,813	-28,905	-70,649	448	134,712
Balances, (in Shares) at Dec. 31, 2013	30,437,000		4,848,000
Issuance of common stock in connection with employee stock purchase plan		1,437				1,437
Issuance of common stock in connection with employee stock purchase plan (in Shares)	114,000					114,000
Issuance of common stock in connection with exercise of options		3,225				3,225
Issuance of common stock in connection with exercise of options (in Shares)	509,000					509,000
Vesting of restricted stock units (in Shares)	350,000
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			-1,577			-1,577
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in Shares)	-100,000		100,000
Purchases of treasury stock			-3,566			-3,566
Purchases of treasury stock (in Shares)	-194,000		194,000
Stock-based compensation expense		8,512				8,512
Tax benefit from employee stock plans		1,747				1,747
Comprehensive income				18,462	-1,129	17,333
Balances, at Dec. 31, 2014	$5	$248,734	($34,048)	($52,187)	($681)	$161,823
Balances, (in Shares) at Dec. 31, 2014	31,116,000		5,142,000

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$18,462,000	$20,929,000	$37,211,000
Depreciation and amortization	2,010,000	1,385,000	515,000
Stock-based compensation expense	8,547,000	6,693,000	4,891,000
Impairment of deferred costs	1,892,000
Amortization of acquired intangible assets	31,000	74,000	434,000
Deferred taxes	2,886,000	5,539,000	-20,060,000
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	-1,577,000	-1,283,000	-511,000
Provision for doubtful accounts	27,000	3,000	97,000
Unrealized loss on foreign currency forward contract	50,000
Loss (gain) on disposal of assets	-242,000	-7,000	45,000
Gain on sale of investments			-50,000
Net impairment of investments			75,000
Tax benefit related to stock-based compensation expense	1,747,000	362,000	149,000
Excess tax benefit from stock-based compensation expense	-1,635,000	-353,000	-114,000
Changes in operating assets and liabilities:
Accounts receivable, net of allowances	-2,892,000	-636,000	-12,150,000
Prepaid expenses and other assets	-657,000	-1,053,000	-1,250,000
Accounts payable	-1,516,000	-566,000	722,000
Accrued compensation and related benefits	-1,421,000	-3,216,000	5,669,000
Accrued and other liabilities	7,000	-913,000	13,000
Deferred revenues	1,713,000	-1,131,000	352,000
Billings in excess of recognized revenues	-343,000	-464,000	-1,282,000
Net cash provided by operating activities	27,089,000	25,363,000	14,756,000
Investing activities:
Proceeds from the sale of investments			975,000
Proceeds from the sale of property and equipment	285,000
Purchases of property and equipment	-3,958,000	-4,628,000	-2,334,000
Net cash used in investing activities	-3,673,000	-4,628,000	-1,359,000
Financing activities:
Exercise of stock options	3,225,000	5,339,000	5,527,000
Proceeds from employee stock purchase plan	1,437,000	1,317,000	977,000
Purchases of treasury stock	-3,566,000		-4,368,000
Excess tax benefit from stock-based compensation expense	1,635,000	353,000	114,000
Net cash provided by financing activities	2,731,000	7,009,000	2,250,000
Effect of exchange rate changes on cash and cash equivalents	-54,000	-10,000	-51,000
Net increase in cash and cash equivalents	26,093,000	27,734,000	15,596,000
Cash and cash equivalents, beginning of year	89,371,000	61,637,000	46,041,000
Cash and cash equivalents, end of year	115,464,000	89,371,000	61,637,000
Supplemental disclosure of cash flow information:
Taxes	4,222,000	4,747,000	1,665,000
Property and equipment received and accrued in accounts payable and accrued and other liabilities	$212,000	$312,000	$486,000

Note_1_Business_and_Significan

Note 1 - Business and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block [Abstract]
Business Description and Accounting Policies [Text Block]	1.  Business and Significant Accounting Policies
	PDF Solutions, Inc. (the “Company” or “PDF”), provides infrastructure technologies and services to improve yield and optimize performance of integrated circuits. The Company’s approach includes manufacturing simulation and analysis, combined with yield improvement methodologies to increase product yield and performance.
	Basis of Presentation  — The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all significant intercompany balances and transactions.
	Use of Estimates  —  The preparation of financial statements in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include revenue recognition for fixed-price solution implementation service contracts, stock-based compensation expense and accounting for income taxes. Actual results could differ from those estimates.
	Concentration of Credit Risk  — Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents with what it considers high credit quality financial institutions.
	The Company primarily sells its technologies and services to companies in Asia, Europe and North America within the semiconductor industry. As of December 31, 2014, three customers accounted for 80% of the Company’s gross accounts receivable and 79% of the Company’s revenues for 2014. As of December 31, 2013, three customers accounted for 76% of the Company’s gross accounts receivable and 74% of the Company’s revenues for 2013. See Note 10 for further details. The Company does not require collateral or other security to support accounts receivable. To reduce credit risk, management performs ongoing credit evaluations of its customers’ financial condition. The Company maintains allowances for potential credit losses.  The allowance for doubtful accounts, which was based on management’s best estimates, could be adjusted in the near term from current estimates depending on actual experience. Such adjustments could be material to the consolidated financial statements.
	Cash, Cash Equivalents and Short-term Investments — The Company considers all highly liquid investments with an original maturity of 90 days or less to be cash equivalents. Investments with original maturities greater than three months and less than one year are classified as short-term investments.
	Property and Equipment  — Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the related asset as follows:
	Computer equipment (years)	3
	Software (years)	3
	Furniture, fixtures, and equipment (years)	5	-	7
	Leasehold improvements	Shorter of estimated useful life or term of lease
	Long-lived Assets  — The Company’s long-lived assets, excluding goodwill, consist of property and equipment and other acquired intangibles. The Company periodically reviews its long-lived assets for impairment. For assets to be held and used, the Company initiates its review whenever events or changes in circumstances indicate that the carrying amount of a long-lived asset group may not be recoverable. Recoverability of an asset group is measured by comparison of its carrying amount to the expected future undiscounted cash flows that the asset group is expected to generate. If it is determined that an asset group is not recoverable, an impairment loss is recorded in the amount by which the carrying amount of the asset group exceeds its fair value.
	Revenue Recognition  — The Company derives revenue from two sources: Design-to-silicon-yield solutions and Gainshare performance incentives.
	Design-to-silicon-yield solutions — Revenues that are derived from Design-to-silicon-yield solutions come from services and software licenses. The Company recognizes revenue for each element of Design-to-silicon-yield solutions as follows:
	The Company generates a significant portion of its Design-to-silicon-yield solutions revenue from fixed-price solution implementation service contracts delivered over a specific period of time. These contracts require reliable estimation of costs to perform obligations and the overall scope of each engagement. Revenue under project–based contracts for solution implementation services is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting. Losses on fixed-price solution implementation contracts are recognized in the period when they become probable. Revisions in profit estimates are reflected in the period in which the conditions that require the revisions become known and can be estimated. Revenue under time and materials contracts for solution implementation services are recognized as the services are performed. On occasion, the Company licenses its software products as a component of its fixed-price service contracts. In such instances, the software products are licensed to customers over a specified term of the agreement with support and maintenance to be provided at each customer's option over the license term. The amount of product and service revenue recognized in a given period is affected by the Company’s judgment as to whether an arrangement includes multiple deliverables and, if so, the Company’s determination of the fair value of each deliverable. In general, vendor-specific objective evidence of selling price (“VSOE”) does not exist for the Company’s solution implementation services and software products and because the Company’s services and products include our unique technology, the Company is not able to determine third-party evidence of selling price (“TPE”). Therefore, in such circumstances the Company uses best estimated selling prices (“BESP”) in the allocation of arrangement consideration. In determining BESP, the Company applies significant judgment as the Company’s weighs a variety of factors, based on the facts and circumstances of the arrangement. The Company typically arrives at BESP for a product or service that is not sold separately by considering company-specific factors such as geographies, internal costs, gross margin objectives, pricing practices used to establish bundled pricing, and existing portfolio pricing and discounting. After fair value is established for each deliverable, the total transaction amount is allocated to each deliverable based upon its relative fair value. Fees allocated to solution implementation services are recognized using the cost-to-cost percentage of completion method of contract accounting. Fees allocated to software and related support and maintenance are recognized under software revenue recognition guidance.
	The Company defers certain pre-contract costs incurred for specific anticipated contracts. Deferred costs consist primarily of direct costs to provide solution implementation services in relation to the specific anticipated contracts. The Company recognizes such costs as a component of cost of revenues, the timing of which is dependent upon persuasive evidence of contract arrangement assuming all other revenue recognition criteria are met. At the end of the reporting period, the Company evaluates its deferred costs for their probable recoverability. The Company recognizes impairment of deferred costs when it is determined that the costs no longer have future benefits and are no longer recoverable. Deferred costs balance was $0.1 million and $0.7 million as of December 31, 2014 and December 31, 2013, respectively. The balance was included in prepaid expenses and other current assets in the accompanying condensed consolidated balance sheets. During the year ended December 31, 2014, the Company impaired $1.9 million of deferred pre-contract costs for two contracts with a customer as it was determined that the costs were no longer recoverable. The impairment charges were recorded in the impairment of deferred costs in the accompanying condensed consolidated statements of operations and comprehensive income.
	The Company also licenses its software products separately from its solution implementations. For software license arrangements that do not require significant modification or customization of the underlying software, software license revenue is recognized under the residual method when (1) persuasive evidence of an arrangement exists, (2) delivery has occurred, (3) the fee is fixed or determinable, (4) collectability is probable, and (5) the arrangement does not require services that are essential to the functionality of the software. When arrangements include multiple elements such as support and maintenance, consulting (other than for its fixed price solution implementations), installation, and training, revenue is allocated to each element of a transaction based upon its fair value as determined by the Company’s VSOE and such services are recorded as services revenue. VSOE for maintenance is generally established based upon negotiated renewal rates while VSOE for consulting, installation, and training services is established based upon the Company’s customary pricing for such services when sold separately. Revenue for software licenses with extended payment terms is not recognized in excess of amounts due. For software license arrangements that require significant modification or customization of the underlying software, the software license revenue is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting, and such revenue is recorded as services revenue.
	Gainshare Performance Incentives — When the Company enters into a contract to provide yield improvement services, the contract usually includes two components: (1) a fixed fee for performance by the Company of services delivered over a specific period of time; and (2) a Gainshare performance incentive component where the customer may pay a contingent variable fee, usually after the fixed fee period has ended. Revenue derived from Gainshare performance incentives represents profit sharing and performance incentives earned contingent upon the Company’s customers reaching certain defined operational levels established in related solution implementation service contracts. Gainshare performance incentives periods are usually subsequent to the delivery of all contractual services and therefore have no cost to the Company. Due to the uncertainties surrounding attainment of such operational levels, the Company recognizes Gainshare performance incentives revenue (to the extent of completion of the related solution implementation contract) upon receipt of performance reports or other related information from the customer supporting the determination of amounts and probability of collection.
	Accounts Receivable  — Accounts receivable includes amounts that are unbilled at the end of the period. Unbilled accounts receivable are determined on an individual contract basis and were approximately $9.7 million and $8.0 million at December 31, 2014 and 2013, respectively. The Company performs ongoing credit evaluations of its customers’ financial condition. An allowance for doubtful accounts is maintained for probable credit losses based upon the Company’s assessment of the expected collectability of the accounts receivable. The allowance for doubtful accounts is reviewed on a quarterly basis to assess the adequacy of the allowance.
	Allowance for doubtful accounts are summarized below:
		Balance at			Charged		Deductions/		Balance
		Beginning			to Costs		Write-offs		at End
		of Period			and Expenses		of Accounts		of Period
	Allowance for doubtful accounts
	2014	$	354		$	27	$	—	$	381
	2013	$	351		$	3	$	—	$	354
	2012	$	254		$	97	$	—	$	351
	Software Development Costs  — Costs for the development of new software products and substantial enhancements to existing software products are expensed as incurred until technological feasibility has been established, at which time any additional costs would be capitalized. Because the Company believes its current process for developing software is essentially completed concurrently with the establishment of technological feasibility, no costs have been capitalized to date.
	Research and Development  — Research and development expenses are charged to operations as incurred.
	Stock-Based Compensation  — Stock-based compensation is estimated at the grant date based on the award’s fair value and is recognized on a straight-line basis over the vesting periods, generally four years. As stock-based compensation expense recognized is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The Company has elected to use the Black-Scholes-Merton option-pricing model, which incorporates various assumptions including volatility, expected life and interest rates. The expected volatility is based on the historical volatility of the Company’s common stock over the most recent period commensurate with the estimated expected life of the Company’s stock options. The expected life of an award is based on historical experience and on the terms and conditions of the stock awards granted to employees. The interest rate assumption is based upon observed Treasury yield curve rates appropriate for the expected life of the Company’s stock options.
	Income Taxes – The Company's provision for income tax comprises its current tax liability and change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities. The measurement of current and deferred tax assets and liabilities is based on provisions of enacted tax laws; the effect of future changes in tax laws or rates are not anticipated. Valuation allowances are provided to reduce deferred tax assets to an amount that in management’s judgment is more likely than not to be recoverable against future taxable income. No U.S. taxes are provided on earnings of non-U.S. subsidiaries, to the extent such earnings are deemed to be permanently invested. The Company's income tax calculations are based on application of the respective U.S. federal, state or foreign tax laws. The Company’s tax filings, however, are subject to audit by the respective tax authorities.  Accordingly, the Company recognizes tax liabilities based upon its estimate of whether, and the extent to which, additional taxes will be due when such estimates are more-likely-than-not to be sustained. An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. To the extent the final tax liabilities are different than the amounts originally accrued, the increases or decreases are recorded as income tax expense or benefit in the consolidated statements of operations.
	Net Income Per Share – Basic net income per share is computed by dividing net income by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net income per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. Dilutive potential common shares consist of incremental common shares issuable upon exercise of stock options, upon vesting of restricted stock units, contingently issuable shares for all periods and assumed issuance of shares under employee stock purchase plan. No dilutive potential common shares are included in the computation of any diluted per share amount when a loss from continuing operations was reported by the Company.
	Foreign Currency Translation  — The functional currency of the Company’s foreign subsidiaries is the local currency for the respective subsidiary. The assets and liabilities are translated at the period-end exchange rate, and statements of operations are translated at the average exchange rate during the year. Gains and losses resulting from foreign currency translations are included as a component of other comprehensive income (loss). Gains and losses resulting from foreign currency transactions are included in the consolidated statement of operations.
	Derivative Financial Instruments — The Company operates internationally and is exposed to potentially adverse movements in foreign currency exchange rates. The Company enters into foreign currency forwards contracts to reduce the exposure to foreign currency exchange rate fluctuations on certain foreign currency denominated monetary assets and liabilities. The Company does not use foreign currency contracts for speculative or trading purposes. The Company records these forward contracts at fair value. The counterparty to these foreign currency forward contracts is a large global financial institution that the Company believes is creditworthy, and therefore, we believe the credit risk of counterparty non-performance is not significant. These foreign currency forward contracts are not designated for hedge accounting treatment. Therefore, the change in fair value of these derivatives is recorded into earnings as a component of other income (expense), net and offsets the change in fair value of the foreign currency denominated monetary assets and liabilities, which are also recorded in other income (expense), net. The duration of these forward contracts is usually between two to three months.
	Litigation  — From time to time, the Company is subject to various claims and legal proceedings that arise in the ordinary course of business. The Company accrues for losses related to litigation when a potential loss is probable and the loss can be reasonably estimated in accordance with Financial Accounting Standard Board ("FASB") requirements. As of December 31, 2014, The Company is not party to any material legal proceedings, thus no loss was probable and no amount was accrued.
	Recent Accounting Pronouncements —
	In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers”. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration for which the entity expects to be entitled in exchange for those goods or services. The updated standard will replace existing revenue recognition guidance under GAAP when it becomes effective. Early adoption is not permitted. The updated standard will be effective for the Company beginning January 1, 2017 and can be applied either retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption. The Company has not yet selected a transition method and is currently evaluating the impact of adopting this new accounting standard on its financial statements.
	In August 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-15, “Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern”. The new standard provides guidance around management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on our financial statements.

Note_2_Property_and_Equipment

Note 2 - Property and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	2.  Property and Equipment
	Property and equipment consist of (in thousands):
		December 31,
		2014			2013
	Computer equipment	$	9,817		$	9,969
	Software		3,369			3,441
	Furniture, fixtures, and equipment		756			734
	Leasehold improvements		1,127			1,052
	Test equipment		6,401			4,928
	Construction-in-progress		2,405			1,421
			23,875			21,545
	Accumulated depreciation and amortization		(15,043	)		(14,481	)
		$	8,832		$	7,064
	Depreciation and amortization expense for years ended December 31, 2014, 2013 and 2012 was $2.0 million, $1.4 million and $0.5 million, respectively.

Note_3_Intangible_Assets

Note 3 - Intangible Assets	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block [Abstract]
Intangible Assets Disclosure [Text Block]	3.   Intangible Assets
	Intangible assets balance was zero and $31,000 as of December 31, 2014 and 2013, respectively. Intangible asset amortization expense for the years ended December 31, 2014, 2013 and 2012 was $31,000, $74,000, and $0.4 million, respectively.
	Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. During the years ended December 31, 2014, 2013 and 2012, there were no indicators of impairment related to the Company’s intangible assets.

Note_4_Other_Noncurrent_Liabil

Note 4 - Other Non-current Liabilities	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Noncurrent [Text Block]	4.  Other Non-Current Liabilities
	Other non-current liabilities consist of (in thousands):
		December 31,
		2014		2013
	Non-current portion of deferred rent	$	314	$	384
	Non-current portion of deferred revenues		313		244
	Total other non-current liabilities	$	627	$	628

Note_5_Commitments_and_Conting

Note 5 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	5.  Commitments and Contingencies
	Leases  — The Company leases administrative and sales offices and certain equipment under noncancelable operating leases, which contain various renewal options and, in some cases, require payment of common area costs, taxes and utilities. These operating leases expire at various times through 2019. Rent expense was $2.1 million, $2.0 million and $2.2 million in 2014, 2013 and 2012, respectively.
	Future minimum lease payments under noncancelable operating leases at December 31, 2014 are as follows (in thousands):
	Year Ending December 31,
	2015	$	1,827
	2016		1,744
	2017		1,402
	2018		794
	2019		58
	Total future minimum lease payments	$	5,825
	Indemnifications  — The Company generally provides a warranty to its customers that its software will perform substantially in accordance with documented specifications typically for a period of 90 days following delivery of its products. The Company also indemnifies certain customers from third-party claims of intellectual property infringement relating to the use of its products. Historically, costs related to these guarantees have not been significant. The Company is unable to estimate the maximum potential impact of these guarantees on its future results of operations.
	Purchase obligations — The Company has purchase obligations with certain suppliers for the purchase of goods and services entered in the ordinary course of business. As of December 31, 2014, total outstanding purchase obligations were $3.1 million which are primarily due within the next 12 months.
	Indemnification of Officers and Directors  — As permitted by the Delaware general corporation law, the Company has included a provision in its certificate of incorporation to eliminate the personal liability of its officers and directors for monetary damages for breach or alleged breach of their fiduciary duties as officers or directors, other than in cases of fraud or other willful misconduct.
	In addition, the Bylaws of the Company provide that the Company is required to indemnify its officers and directors even when indemnification would otherwise be discretionary, and the Company is required to advance expenses to its officers and directors as incurred in connection with proceedings against them for which they may be indemnified. The Company has entered into indemnification agreements with its officers and directors containing provisions that are in some respects broader than the specific indemnification provisions contained in the Delaware general corporation law. The indemnification agreements require the Company to indemnify its officers and directors against liabilities that may arise by reason of their status or service as officers and directors other than for liabilities arising from willful misconduct of a culpable nature, to advance their expenses incurred as a result of any proceeding against them as to which they could be indemnified, and to obtain directors’ and officers’ insurance if available on reasonable terms. The Company has obtained directors’ and officers’ liability insurance in amounts comparable to other companies of the Company’s size and in the Company’s industry. Since a maximum obligation of the Company is not explicitly stated in the Company’s Bylaws or in its indemnification agreements and will depend on the facts and circumstances that arise out of any future claims, the overall maximum amount of the obligations cannot be reasonably estimated.
	Litigation — From time to time, the Company is subject to various claims and legal proceedings that arise in the ordinary course of business. The Company accrues for losses related to litigation when a potential loss is probable and the loss can be reasonably estimated in accordance with FASB requirements. As of December 31, 2014, the Company was not party to any material legal proceedings, thus no loss was probable and no amount was accrued.

Note_6_Stockholders_Equity

Note 6 - Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]
Shareholders' Equity and Share-based Payments [Text Block]	6.  Stockholders’ Equity
	Stock-based compensation expenses related to the Company’s employee stock purchase plan and stock plans were allocated as follows (in thousands):
		Years Ended December 31,
		2014			2013			2012
	Cost of Design-to-silicon-yield solutions	$	3,419		$	2,736		$	1,786
	Research and development		1,709			1,583			1,083
	Selling, general and administrative		3,419			2,374			2,022
	Stock-based compensation expense	$	8,547		$	6,693		$	4,891
	The stock-based compensation expense for the year ended December 31, 2014 and 2013 in the table above includes expense related to cash-settled stock appreciation rights (“SARs”) granted to certain employees which totaled $34,000 and $102,000, respectively. The Company accounted for these awards as a liability and the amount was included in accrued compensation and related benefits.
	Stock-based compensation is estimated at the grant date based on the award’s fair value and is recognized on a straight-line basis over the vesting periods, generally four years.  As stock-based compensation expense recognized is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
	The Company has elected to use the Black-Scholes-Merton option-pricing model, which incorporates various assumptions including volatility, expected life and interest rates. The expected volatility is based on the historical volatility of the Company’s common stock over the most recent period commensurate with the estimated expected life of the Company’s stock options. The expected life of an award is based on historical experience and on the terms and conditions of the stock awards granted to employees. The interest rate assumption is based upon observed Treasury yield curve rates appropriate for the expected life of the Company’s stock options.
	The fair value of equity awards granted was estimated on the date of grant with the following weighted average assumptions:
		Stock Plans									Employee Stock
											Purchase Plan
		2014			2013			2012			2014			2013			2012
	Expected life (in years)		4.6			4.8			4.8			1.25			1.25			1.25
	Volatility		44	%		54.1	%		59.2	%		33.4	%		45.3	%		51.6	%
	Risk-free interest rate		1.54	%		1.03	%		0.77	%		0.21	%		0.19	%		0.18	%
	Expected dividend		—			—			—			—			—			—
	On December 31, 2014, the Company had in effect the following stock-based compensation plans:
	Stock Plans —  At the annual meeting of stockholders on November 16, 2011, the Company’s stockholders approved the 2011 Stock Incentive Plan, which was amended and restated at the 2013 annual meeting of stockholders on May 28, 2013, when the Company’s stockholders approved the First Amended and Restated 2011 Stock Incentive Plan, and then subsequently amended at the 2014 annual meeting of stockholders on May 27, 2014, when the Company’s stockholders approved the Second Amended and Restated 2011 Incentive Plan (as amended, the “2011 Plan”). Under the 2011 Plan, the Company may award stock options, stock appreciation rights, stock grants or stock units covering shares of the Company's common stock to employees, directors, non-employee directors and contractors. The aggregate number of shares reserved for awards under this plan is 6,550,000 shares, plus up to 3,500,000 shares previously issued under the 2001 Plan that are forfeited or repurchased by the Company or shares subject to awards previously issued under the 2001 Plan that expire or that terminate without having been exercised or settled in full on or after November 16, 2011. In case of awards other than options or stock appreciation rights, the aggregate number of shares reserved under the plan will be decreased at a rate of 1.33 shares issued pursuant to such awards. The exercise price for stock options must generally be at prices no less than the fair market value at the date of grant. Stock options generally expire ten years from the date of grant and become vested and exercisable over a four-year period.
	In 2001, the Company adopted a 2001 Stock Plan (the “2001 Plan”). In 2003, in connection with its acquisition of IDS Systems Inc., the Company assumed IDS’ 2001 Stock Option / Stock Issuance Plan (the “IDS Plan”). Both of the 2001 and the IDS Plans expired in 2011. Stock options granted under the 2001 and IDS Plans generally expire ten years from the date of grant and become vested and exercisable over a four-year period. Although no new awards may be granted under the 2001 or IDS Plans, awards made under the 2001 and IDS Plans that are currently outstanding remain subject to the terms of each such plan.
	As of December 31, 2014, 7.0 million shares of common stock were reserved to cover stock-based awards under the 2011 Plan, of which 4.0 million shares were available for future grant. The number of shares reserved and available under the 2011 Plan includes 0.4 million shares that were subject to awards previously made under the 2001 Plan and were forfeited, expired or repurchased by the Company after adoption of the 2011 Plan through December 31, 2014. As of December 31, 2014, there were no outstanding awards that had been granted outside of the 2011, 2001 or the IDS Plans (collectively, the "Stock Plans").
	Additional information with respect to options under the Plans is as follows:
		Outstanding Options
		Number of			Weighted			Weighted			Aggregate
		Options			Average			Average			Intrinsic Value
		(in thousands)			Exercise Price			Remaining			(in thousands)
					per Share			Contractual
								Term (years)
	Outstanding, January 1, 2012		3,872			5.91
	Granted (weighted average fair value of $4.38 per share)		1,216			8.8
	Exercised		(1,019	)		5.42
	Canceled		(216	)		6.34
	Expired		(43	)		9.78
	Outstanding, December 31, 2012		3,810			6.91
	Granted (weighted average fair value of $7.75 per share)		77			17.12
	Exercised		(871	)		6.13
	Canceled		(114	)		8.76
	Expired		(22	)		5.98
	Outstanding, December 31, 2013		2,880			7.35
	Granted (weighted average fair value of $6.66 per share)		28			17.4
	Exercised		(509	)		6.33
	Canceled		(40	)		10.03
	Expired		(7	)		7.41
	Outstanding, December 31, 2014		2,352			7.65			5.72		$	17,218
	Vested and expected to vest, December 31, 2014		2,329			7.62			5.7		$	17,103
	Exercisable, December 31, 2014		1,858			7.21			5.27		$	14,304
	The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $14.86 as of December 31, 2014, which would have been received by the option holders had all option holders exercised their options as of that date. The total intrinsic value of options exercised during the year ended December 31, 2014, 2013 and 2012 was $6.7 million, $11.9 million and $5.8 million.
	As of December 31, 2014, there was $2.1 million of total unrecognized compensation cost net of forfeitures related to unvested stock options. That cost is expected to be recognized over a weighted average period of 1.36 years. The total fair value of options vested during the year ended December 31, 2014 was $2.2 million. As of December 31, 2013, there was $4.1 million of total unrecognized compensation cost net of forfeitures related to unvested stock options. That cost is expected to be recognized over a weighted average period of 2.07 years. The total fair value of options vested during the year ended December 31, 2013 was $2.9 million.
	Nonvested shares (restricted stock units) were as follows:
		Shares			Weighted-
		(in			Average
		thousands)			Grant-Date
					Fair Value
	Nonvested, January 1, 2012		303			7.82
	Granted		359			8.97
	Vested		(172	)		9.87
	Forfeited		(40	)		7.66
	Nonvested, December 31, 2012		450			7.97
	Granted		562			18.25
	Vested		(217	)		11.01
	Forfeited		(36	)		11.08
	Nonvested, December 31, 2013		759			14.44
Granted		569			19.42
Vested		(350	)		14.43
Forfeited		(37	)		18
Nonvested, December 31, 2014
		941			17.38
As of December 31, 2014, there was $13.8 million of total unrecognized compensation cost related to restricted stock rights. That cost is expected to be recognized over a weighted average period of 2.63 years. Restricted stock units do not have rights to dividends prior to vesting.
Employee Stock Purchase Plan — In July 2001, the Company adopted a ten-year Employee Stock Purchase Plan (“Purchase Plan”) under which eligible employees can contribute up to 10% of their compensation, as defined in the Purchase Plan, towards the purchase of shares of PDF common stock at a price of 85% of the lower of the fair market value at the beginning of the offering period or the end of the purchase period. The Purchase Plan consists of twenty-four-month offering periods with four six-month purchase periods in each offering period. Under the Purchase Plan, on January 1 of each year, starting with 2002, the number of shares reserved for issuance will automatically increase by the lesser of (1) 675,000 shares, (2) 2% of the Company’s outstanding common stock on the last day of the immediately preceding year, or (3) the number of shares determined by the board of directors. At the annual meeting of stockholders on May 18, 2010, the Company's stockholders approved an amendment to the Purchase Plan to extend it through May 17, 2020. As of December 31, 2014, 4.5 million shares of the Company’s common stock have been reserved for issuance under the Purchase Plan. During 2014, 2013 and 2012, the number of shares issued were 114,000, 184,000 and 201,000, respectively, at a weighted average price of $12.62, $7.16 and $4.86 per share, respectively. As of December 31, 2014, 1.2 million shares were available for future issuance under the Purchase Plan. The weighted average estimated fair value of shares granted under the Purchase Plan during 2014, 2013 and 2012 was $6.41, $5.56 and $3.00 per share, respectively. For the year ended December 31, 2014, 2013 and 2012, the Purchase Plan compensation expense was $0.6 million, $0.6 million and $0.4 million, respectively. As of December 31, 2014, there was $0.2 million of unrecognized compensation cost related to the Purchase Plan. That cost is expected to be recognized over a weighted average period of 0.7 years.
Stock Repurchase Program  — On October 29, 2007, the Board of Directors adopted a program to repurchase up to $10.0 million of the Company’s common stock on the open market. The initial program was for three years, but on October 19, 2010, the Board of Directors authorized an extension of, and an increase in, the program and the aggregate amount available to repurchase between October 19, 2010 and October 29, 2012 was reset to $10.0 million of the Company’s common stock, meaning a total of $19.3 million was available. The program expired on October 29, 2012, as of which date, 3.8 million shares had been repurchased at the average price of $4.53 per share and a total purchase price of $17.0 million. On November 8, 2012, the Board of Directors adopted a program to repurchase up to $20.0 million of the Company’s common stock on the open market over the next two years. As of December 31, 2014, 230,311 shares had been repurchased at the average price of $17.56 per share under this program, at a total purchase of $4.0 million. The program expired on November 8, 2014. On October 21, 2014, the Board of Directors adopted a new program, effectively immediately, to repurchase up to $25.0 million of the Company’s common stock both on the open market and in privately negotiated transactions over the next two years. As of December 31, 2014, no shares had been repurchased under this new program.

Note_7_Restructuring

Note 7 - Restructuring	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities Disclosure [Text Block]	7. Restructuring
	From time to time, the Company has implemented restructuring plans. For the year ended on December 31, 2014, 2013 and 2012, the Company recorded total restructuring charges of $57,000, $0.2 million and $1.8 million, respectively. As of December 31, 2014, the Company had no outstanding restructuring accrual balance.
	October 2012 Plan
	On October 24, 2012, the Company announced a restructuring plan as part of the Company’s efforts to simplify the organization, leverage cross-training and learning, and reduce annual operations expenses. Under this plan, the Company has recorded restructuring charges of $2.2 million, which primarily consisted of employee severance costs of $2.1 million. The following table summarizes the activities of these restructuring liabilities (in thousands):
		Severance			Professional			Total
					and Other
					Fees
	Balances, January 1, 2012	$	—		$	—		$	—
	Restructuring charges		1,733			73			1,806
	Payments		(848	)		(62	)		(910	)
	Balances, December 31, 2012	$	885		$	11		$	896
	Restructuring charges		249			51			300
	Payments		(1,121	)		(62	)		(1,183	)
	Balances, December 31, 2013	$	13		$	—		$	13
	Restructuring charges		57			—			57
	Payments		(70	)		—			(70	)
	Balances, December 31, 2014	$	—		$	—		$	—

Note_8_Income_Taxes

Note 8 - Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	8.  Income Taxes
		Year Ended December 31,
		2014			2013			2012
		(In thousands)
	U.S.
	Current	$	3,032		$	719		$	271
	Deferred		2,882			5,432			(19,863	)
	Foreign
	Current		476			291			512
	Withholding		3,103			3,830			948
	Deferred		4			108			(197	)
	Total provision (benefit)	$	9,497		$	10,380		$	(18,329	)
	During the years ended December 31, 2014, 2013 and 2012, income before taxes from U.S. operations was $26.2 million, $29.6 million and $17.7 million, respectively, and income before taxes from foreign operations was $1.8 million, $1.7 million and $1.2 million, respectively.
	The income tax provision (benefit) differs from the amount estimated by applying the statutory federal income tax rate (35%) for the following reasons (in thousands):
		Year Ended December 31,
		2014			2013			2012
	Federal statutory tax provision	$	9,786		$	10,958		$	6,609
	State tax provision (benefit)		56			581			(925	)
	Stock compensation expense		540			393			644
	Tax credits		(3,924	)		(5,424	)		(722	)
	Foreign tax, net		3,170			3,884			906
	Change in valuation allowance		—			—			(25,223	)
	Other		(131	)		(12	)		382
	Tax provision (benefit)	$	9,497		$	10,380		$	(18,329	)
	As of December 31, 2014, the Company had California net operating loss carry-forwards (“NOLs”) of approximately $6.2 million. The California NOLs begin expiring after 2031.
	The Company’s 2012 tax provision did not include the benefit of the 2012 federal R&D credit. On January 2, 2013, the President of the United States signed into law The American Taxpayer Relief Act of 2012. Under prior U.S. law, a taxpayer was entitled to a research tax credit for qualifying amounts paid or incurred on or before December 31, 2011. The 2012 Taxpayer Relief Act extended the research tax credit for two years to December 31, 2013. The extension of the research tax credit was retroactive to January 1, 2012 and included amounts paid or incurred after December 31, 2011. As of December 31, 2014, the Company had federal and state research and experimental and other tax credit (“R&D credits”) carry-forwards of approximately $9.2 million and $12.4 million, respectively. The federal credits begin to expire after 2025, while the California credits have no expiration. The extent to which the federal and state credit carry forwards can be used to offset future tax liabilities, respectively, may be limited, depending on the extent of ownership changes within any three-year period as provided in the Tax Reform Act of 1986 and the California Conformity Act of 1987.
	The Company assesses its deferred tax assets for recoverability on a regular basis, and where applicable, a valuation allowance is recorded to reduce the total deferred tax asset to an amount that will, more likely than not, be realized in the future. In fiscal year 2008, management concluded that it was more likely than not that the Company’s net deferred tax assets would not be fully realizable. As a result of management’s evaluation, the Company recorded valuation allowances against substantially all of its net deferred tax assets at that time. The Company evaluates positive and negative evidence at each financial reporting period to determine whether it is more likely than not that the Company’s deferred tax assets would be realizable.  In accordance with such process, at December 31, 2012, the Company again evaluated the available objective evidence, both positive and negative, and concluded that it was more likely than not at that time that a portion of its deferred tax assets would be realizable, and accordingly, the Company determined that valuation allowances aggregating to $19.9 million were no longer needed. This amount released from the valuation allowance has been reported as a component of income tax benefit in the accompanying Consolidated Statement of Operations for the year ended December 31, 2012. The remaining balance of the valuation allowance primarily relates to California R&D tax credits that have not met the “more-likely-than-not” realization threshold criteria. Under current tax law, the Company on an annual basis generates more California credits than California tax. As a result, at December 31, 2014 and 2013, the excess credits of $5.4 million and $5.1 million, respectively continued to be subject to a full valuation allowance. The Company will continue to review its deferred tax assets in accordance with the applicable accounting standards. Net deferred tax assets balance as of December 31, 2014 and 2013 was $11.3 million and $14.5 million respectively. The balance as of December 31, 2014 consists of $3.3 million net deferred tax assets-current portion and $8.0 million net deferred tax assets-long-term portion. The balance as of December 31, 2013 consists of $5.9 million net deferred tax assets-current portion and $8.6 million net deferred tax assets-long-term portion.
	Tax attributes related to stock option windfall deductions are not recorded until they result in a reduction of cash tax payable. Federal tax credits and state net operating losses from windfall deductions were excluded from the deferred tax asset balance as of December 31, 2014. As of December 31, 2014, the benefit of the federal credits and state net operating loss deferred tax assets of $5.1 million and $66,000, respectively, will be recorded to additional paid-in capital when they reduce cash taxes payable. As of December 31, 2013, the excluded windfall deductions for federal and state purposes were $4.9 million and $78,000, respectively.
	The components of the net deferred tax assets are comprised of (in thousands):
		December 31,
		2014			2013
	Deferred tax Assets
	Net operating loss carry forward	$	533		$	621
	Research and development and other credit carry forward		5,438			6,938
	Foreign tax credit carry forward		1			—
	Accruals deductible in different periods		3,021			3,931
	Intangible assets		5,555			6,105
	Stock-based compensation		2,861			2,491
	Valuation allowance		(5,433	)		(5,087	)
	Subtotal	$	11,976		$	14,999
	Deferred tax liabilities
	Fixed assets		(632	)		(478	)
	Net Deferred tax assets	$	11,344		$	14,521
	In accordance with the provisions of the accounting standard relating to accounting for uncertain tax positions, the Company classifies its liabilities for income tax exposures as long-term. The Company includes interest and penalties related to unrecognized tax benefits within the Company’s income tax provision. As of December 31, 2014 and 2013, the Company had accrued interest and penalties related to unrecognized tax benefits of $467,000 and $466,000, respectively.  In the years ended December 31, 2014, 2013 and 2012, the Company recognized charges (credits) for interest and penalties related to unrecognized tax benefits in the consolidated statements of operations of $1,000, $39,000 and $(16,000), respectively.
	The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of December 31, 2014 was $10.4 million, of which $6.3 million, if recognized, would affect the Company’s effective tax rate. The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of December 31, 2013 was $10.2 million, of which $6.3 million, if recognized, would affect the Company's effective tax rate. As of December 31, 2014, the Company has recorded unrecognized tax benefits of $2.6 million, including interest and penalties, as long-term income taxes payable in its consolidated balance sheet. The remaining $8.3 million has been recorded net of our deferred tax assets, of which $4.1 million is subject to a full valuation allowance. The Company does not expect the change in unrecognized tax benefits over the next twelve months to materially impact its results of operations and financial position.
	The Company conducts business globally and, as a result, files numerous consolidated and separate income tax returns in the U.S. federal, various state and foreign jurisdictions. Because the Company used some of the tax attributes carried forward from previous years to tax years that are still open, statutes of limitation remain open for all tax years to the extent of the attributes carried forward into tax year 2002 for federal and California tax purposes. The Company’s France income tax examinations for 2009 were closed during the fiscal year of 2012 with immaterial adjustments.  The Company is not subject to income tax examinations in any other of its major foreign subsidiaries’ jurisdictions.
	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
		Amount
	Gross unrecognized tax benefits, January 1, 2012	$	9,644
	Increases in tax positions for current year		616
	Increase in tax positions for prior years		—
	Lapse in statute of limitations		(707	)
	Gross unrecognized tax benefits, December 31, 2012		9,553
	Increases in tax positions for current year		1,052
	Increases in tax positions for prior years		—
	Lapse in statute of limitations		(389	)
	Gross unrecognized tax benefits, December 31, 2013		10,216
	Increases in tax positions for current year		809
	Increases in tax positions for prior years		—
	Lapse in statute of limitations		(597	)
	Gross unrecognized tax benefits, December 31, 2014	$	10,428
	Undistributed earnings of the Company’s foreign subsidiaries of $4.8 million are considered to be indefinitely reinvested and accordingly, no provision for federal and state income taxes has been provided thereon. Determination of the amount of unrecognized deferred tax liability related to these earnings is not practicable at this time.
	Valuation allowance for deferred tax assets is summarized:
		Balance at			Charged			Deductions/			Balance
Beginning		to Costs			Write-offs			at End
of Period		and Expenses			of Accounts			of Period
Valuation allowance for deferred tax assets
2014	$	5,087		$	346		$	—		$	5,433
2013		4,708			379			—			5,087
2012		30,731			—			(26,023	)		4,708

Note_9_Net_Income_Per_Share

Note 9 - Net Income Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	9.  Net Income Per Share
	Basic net income per share is computed by dividing net income by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net income per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. Under the treasury stock method, the amount that the employee must pay for exercising stock options, the amount of compensation cost for future service that the Company has not yet recognized, and the amount of the tax benefits that would be recorded in additional paid-in capital when the award becomes deductible are assumed to be used to repurchase shares.  The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income per share (in thousands except per share amount):
		Year Ended December 31,
		2014		2013		2012
	Numerator:
	Net income	$	18,462	$	20,929	$	37,211
	Numerator:
	Basic weighted-average shares outstanding		30,743		29,826		28,700
	Effect of dilutive options and restricted stock		1,196		1,567		1,109
	Diluted weighted-average shares outstanding		31,939		31,393		29,809
	Net income per share - Basic	$	0.6	$	0.7	$	1.3
	Net income per share - Diluted	$	0.58	$	0.67	$	1.25
	The following table sets forth potential shares of common stock that are not included in the diluted net loss per share calculation above because to do so would be anti-dilutive for the periods indicated (in thousands):
		December 31,
		2014		2013
	Outstanding options		61		49
	Nonvested shares of restricted stock units		19		4
	Employee Stock Purchase Plan		50		7
	Total		130		60

Note_10_Customer_and_Geographi

Note 10 - Customer and Geographic Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	10.  Customer and Geographic Information
	Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or group, in deciding how to allocate resources and in assessing performance.
	The Company’s chief operating decision maker, the chief executive officer, reviews discrete financial information presented on a consolidated basis for purposes of regularly making operating decisions and assessing financial performance. Accordingly the Company considers itself to be in one operating segment, specifically the licensing and implementation of yield improvement solutions for integrated circuit manufacturers.
	The Company had revenues from individual customers in excess of 10% of total revenues as follows:
		Year Ended December 31,
	Customer	2014			2013			2012
	A		52	%		33	%		40	%
	B		16	%		17	%		20	%
	C		11	%		24	%		13	%
	The Company had accounts receivable balances from individual customers in excess of 10% of the gross accounts receivable balance as follows:
		December 31,
	Customer	2014			2013
	A		51	%		36	%
	B		21	%		17	%
	C		*			23	%
	*  represents less than 10%
	Revenues from customers by geographic area based on the location of the customers’ work sites are as follows (in thousands):
		Year Ended December 31,
		2014						2013						2012
		Revenues			Percentage of			Revenues			Percentage of			Revenues		Percentage of
					Revenues						Revenues					Revenues
	United States	$	44,963			44	%	$	39,057			38	%	$	35,509		40	%
	Germany		35,142			35			22,431			22			25,928		29
	South Korea		5,667			6			20,953			21			9,160		10
	Japan		3,789			4			8,340			8			8,514		10
	Rest of the world		10,602			11			10,672			11			10,429		11
	Total revenue	$	100,163			100	%	$	101,453			100	%	$	89,540		100	%
	Long-lived assets, net by geographic area is as follows (in thousands):
		December 31,
		2014			2013
	United States	$	8,240		$	6,578
	Rest of the world		592			486
	Total long-lived assets, net	$	8,832		$	7,064

Note_11_Financial_Instruments

Note 11 - Financial Instruments	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	11. Financial Instruments
	Fair value is the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The multiple assumptions used to value financial instruments are referred to as inputs, and a hierarchy for inputs used in measuring fair value is established, that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its own market assumptions. These inputs are ranked according to a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels.
	Level 1 -	Inputs are quoted prices in active markets for identical assets or liabilities.
	Level 2 -	Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.
	Level 3 -	Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.
	The following table represents the Company’s assets measured at fair value on a recurring basis as of December 31, 2014 and the basis for that measurement (in thousands):
	Assets		Total		Quoted Prices in		Significant Other		Significant
					Active Markets for		Observable Inputs		Unobservable Inputs
					Identical Assets		(Level 2)		(Level 3)
					(Level 1)
	Money market mutual funds		$	26,356	$	26,356	$	—	$	—
	The following table represents the Company’s assets measured at fair value on a recurring basis as of December 31, 2013 and the basis for that measurement (in thousands):
	Assets		Total		Quoted Prices in		Significant Other		Significant
					Active Markets for		Observable Inputs		Unobservable Inputs
					Identical Assets		(Level 2)		(Level 3)
					(Level 1)
	Money market mutual funds		$	26,353	$	26,353	$	—	$	—
	The Company enters into foreign currency forward contracts to reduce the exposure to foreign currency exchange rate fluctuations on certain foreign currency denominated monetary assets and liabilities, primarily on third-party accounts payables and intercompany balances. The primary objective of the Company’s hedging program is to reduce volatility of earnings related to foreign currency exchange rate fluctuations. The counterparty to these foreign currency forward contracts is a large global financial institution that the Company believes is creditworthy, and therefore, the Company believes the credit risk of counterparty nonperformance is not significant. These foreign currency forward contracts are not designated for hedge accounting treatment. Therefore, the change in fair value of these contracts is recorded into earnings as a component of other income (expense), net, and offsets the change in fair value of the foreign currency denominated assets and liabilities, which is also recorded in other income (expense), net. For the year ended December 31, 2014 and 2013, the Company recognized a realized (loss) gain of ($0.9) million and $0.1 million, respectively on the contracts, which is recorded in other income (expense), net in the Company’s Statement of Operations.
	The Company carries these derivatives financial instruments on its Consolidated Balance Sheets at their fair values. The Company’s foreign currency forward contracts are classified as Level 2 because it is not actively traded and the valuation inputs are based on quoted prices and market observable data of similar instruments. As of December 31, 2014, the Company had one outstanding forward contract with a notional amount of $6.7 million and recorded $50,000 other current liabilities associated with this outstanding forward contract.

Note_12_Employee_Benefit_Plan

Note 12 - Employee Benefit Plan	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]
Compensation and Employee Benefit Plans [Text Block]	12. Employee Benefit Plan
	During 1999, the Company established a 401(k) tax-deferred savings plan, whereby eligible employees may contribute up to 15% of their eligible compensation with a maximum amount subject to IRS guidelines in any calendar year. Company contributions to this plan are discretionary; no such Company contributions have been made since the inception of this plan.

Note_13_Selected_Quarterly_Fin

Note 13 - Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information [Text Block]	13.  Selected Quarterly Financial Data (Unaudited)
	The following is a summary of the Company’s quarterly consolidated results of operations (unaudited) for the fiscal years ended December 31, 2014 and 2013.
		Year Ended December 31, 2014
		Q1		Q2		Q3		Q4
		(In thousands, except for per share amounts)
	Total revenues	$	27,086	$	24,610	$	22,406	$	26,061
	Gross profit	$	17,381	$	15,763	$	10,792	$	16,513
	Net income	$	6,255	$	4,696	$	1,761	$	5,750
	Net income per share:
	Basic	$	0.21	$	0.15	$	0.06	$	0.19
	Diluted	$	0.2	$	0.15	$	0.05	$	0.18
		Year Ended December 31, 2013
		Q1		Q2		Q3		Q4
		(In thousands, except for per share amounts)
	Total revenues	$	24,110	$	24,776	$	25,489	$	27,078
	Gross profit	$	14,453	$	15,035	$	14,982	$	17,513
	Net income	$	4,731	$	4,552	$	4,824	$	6,822
	Net income per share:
	Basic	$	0.16	$	0.15	$	0.16	$	0.23
	Diluted	$	0.15	$	0.15	$	0.15	$	0.21

Accounting_Policies_by_Policy_

Accounting Policies, by Policy (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation  — The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all significant intercompany balances and transactions.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates  —  The preparation of financial statements in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include revenue recognition for fixed-price solution implementation service contracts, stock-based compensation expense and accounting for income taxes. Actual results could differ from those estimates.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentration of Credit Risk  — Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents with what it considers high credit quality financial institutions.
	The Company primarily sells its technologies and services to companies in Asia, Europe and North America within the semiconductor industry. As of December 31, 2014, three customers accounted for 80% of the Company’s gross accounts receivable and 79% of the Company’s revenues for 2014. As of December 31, 2013, three customers accounted for 76% of the Company’s gross accounts receivable and 74% of the Company’s revenues for 2013. See Note 10 for further details. The Company does not require collateral or other security to support accounts receivable. To reduce credit risk, management performs ongoing credit evaluations of its customers’ financial condition. The Company maintains allowances for potential credit losses.  The allowance for doubtful accounts, which was based on management’s best estimates, could be adjusted in the near term from current estimates depending on actual experience. Such adjustments could be material to the consolidated financial statements.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash, Cash Equivalents and Short-term Investments — The Company considers all highly liquid investments with an original maturity of 90 days or less to be cash equivalents. Investments with original maturities greater than three months and less than one year are classified as short-term investments.
Property, Plant and Equipment, Policy [Policy Text Block]	Property and Equipment  — Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the related asset as follows:
	Computer equipment (years)	3
	Software (years)	3
	Furniture, fixtures, and equipment (years)	5	-	7
	Leasehold improvements	Shorter of estimated useful life or term of lease
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Long-lived Assets  — The Company’s long-lived assets, excluding goodwill, consist of property and equipment and other acquired intangibles. The Company periodically reviews its long-lived assets for impairment. For assets to be held and used, the Company initiates its review whenever events or changes in circumstances indicate that the carrying amount of a long-lived asset group may not be recoverable. Recoverability of an asset group is measured by comparison of its carrying amount to the expected future undiscounted cash flows that the asset group is expected to generate. If it is determined that an asset group is not recoverable, an impairment loss is recorded in the amount by which the carrying amount of the asset group exceeds its fair value.
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition  — The Company derives revenue from two sources: Design-to-silicon-yield solutions and Gainshare performance incentives.
	Design-to-silicon-yield solutions — Revenues that are derived from Design-to-silicon-yield solutions come from services and software licenses. The Company recognizes revenue for each element of Design-to-silicon-yield solutions as follows:
	The Company generates a significant portion of its Design-to-silicon-yield solutions revenue from fixed-price solution implementation service contracts delivered over a specific period of time. These contracts require reliable estimation of costs to perform obligations and the overall scope of each engagement. Revenue under project–based contracts for solution implementation services is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting. Losses on fixed-price solution implementation contracts are recognized in the period when they become probable. Revisions in profit estimates are reflected in the period in which the conditions that require the revisions become known and can be estimated. Revenue under time and materials contracts for solution implementation services are recognized as the services are performed. On occasion, the Company licenses its software products as a component of its fixed-price service contracts. In such instances, the software products are licensed to customers over a specified term of the agreement with support and maintenance to be provided at each customer's option over the license term. The amount of product and service revenue recognized in a given period is affected by the Company’s judgment as to whether an arrangement includes multiple deliverables and, if so, the Company’s determination of the fair value of each deliverable. In general, vendor-specific objective evidence of selling price (“VSOE”) does not exist for the Company’s solution implementation services and software products and because the Company’s services and products include our unique technology, the Company is not able to determine third-party evidence of selling price (“TPE”). Therefore, in such circumstances the Company uses best estimated selling prices (“BESP”) in the allocation of arrangement consideration. In determining BESP, the Company applies significant judgment as the Company’s weighs a variety of factors, based on the facts and circumstances of the arrangement. The Company typically arrives at BESP for a product or service that is not sold separately by considering company-specific factors such as geographies, internal costs, gross margin objectives, pricing practices used to establish bundled pricing, and existing portfolio pricing and discounting. After fair value is established for each deliverable, the total transaction amount is allocated to each deliverable based upon its relative fair value. Fees allocated to solution implementation services are recognized using the cost-to-cost percentage of completion method of contract accounting. Fees allocated to software and related support and maintenance are recognized under software revenue recognition guidance.
	The Company defers certain pre-contract costs incurred for specific anticipated contracts. Deferred costs consist primarily of direct costs to provide solution implementation services in relation to the specific anticipated contracts. The Company recognizes such costs as a component of cost of revenues, the timing of which is dependent upon persuasive evidence of contract arrangement assuming all other revenue recognition criteria are met. At the end of the reporting period, the Company evaluates its deferred costs for their probable recoverability. The Company recognizes impairment of deferred costs when it is determined that the costs no longer have future benefits and are no longer recoverable. Deferred costs balance was $0.1 million and $0.7 million as of December 31, 2014 and December 31, 2013, respectively. The balance was included in prepaid expenses and other current assets in the accompanying condensed consolidated balance sheets. During the year ended December 31, 2014, the Company impaired $1.9 million of deferred pre-contract costs for two contracts with a customer as it was determined that the costs were no longer recoverable. The impairment charges were recorded in the impairment of deferred costs in the accompanying condensed consolidated statements of operations and comprehensive income.
	The Company also licenses its software products separately from its solution implementations. For software license arrangements that do not require significant modification or customization of the underlying software, software license revenue is recognized under the residual method when (1) persuasive evidence of an arrangement exists, (2) delivery has occurred, (3) the fee is fixed or determinable, (4) collectability is probable, and (5) the arrangement does not require services that are essential to the functionality of the software. When arrangements include multiple elements such as support and maintenance, consulting (other than for its fixed price solution implementations), installation, and training, revenue is allocated to each element of a transaction based upon its fair value as determined by the Company’s VSOE and such services are recorded as services revenue. VSOE for maintenance is generally established based upon negotiated renewal rates while VSOE for consulting, installation, and training services is established based upon the Company’s customary pricing for such services when sold separately. Revenue for software licenses with extended payment terms is not recognized in excess of amounts due. For software license arrangements that require significant modification or customization of the underlying software, the software license revenue is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting, and such revenue is recorded as services revenue.
	Gainshare Performance Incentives — When the Company enters into a contract to provide yield improvement services, the contract usually includes two components: (1) a fixed fee for performance by the Company of services delivered over a specific period of time; and (2) a Gainshare performance incentive component where the customer may pay a contingent variable fee, usually after the fixed fee period has ended. Revenue derived from Gainshare performance incentives represents profit sharing and performance incentives earned contingent upon the Company’s customers reaching certain defined operational levels established in related solution implementation service contracts. Gainshare performance incentives periods are usually subsequent to the delivery of all contractual services and therefore have no cost to the Company. Due to the uncertainties surrounding attainment of such operational levels, the Company recognizes Gainshare performance incentives revenue (to the extent of completion of the related solution implementation contract) upon receipt of performance reports or other related information from the customer supporting the determination of amounts and probability of collection.
Receivables, Policy [Policy Text Block]	Accounts Receivable  — Accounts receivable includes amounts that are unbilled at the end of the period. Unbilled accounts receivable are determined on an individual contract basis and were approximately $9.7 million and $8.0 million at December 31, 2014 and 2013, respectively. The Company performs ongoing credit evaluations of its customers’ financial condition. An allowance for doubtful accounts is maintained for probable credit losses based upon the Company’s assessment of the expected collectability of the accounts receivable. The allowance for doubtful accounts is reviewed on a quarterly basis to assess the adequacy of the allowance.
Research, Development, and Computer Software, Policy [Policy Text Block]	Software Development Costs  — Costs for the development of new software products and substantial enhancements to existing software products are expensed as incurred until technological feasibility has been established, at which time any additional costs would be capitalized. Because the Company believes its current process for developing software is essentially completed concurrently with the establishment of technological feasibility, no costs have been capitalized to date.
Research and Development Expense, Policy [Policy Text Block]	Research and Development  — Research and development expenses are charged to operations as incurred.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Stock-Based Compensation  — Stock-based compensation is estimated at the grant date based on the award’s fair value and is recognized on a straight-line basis over the vesting periods, generally four years. As stock-based compensation expense recognized is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The Company has elected to use the Black-Scholes-Merton option-pricing model, which incorporates various assumptions including volatility, expected life and interest rates. The expected volatility is based on the historical volatility of the Company’s common stock over the most recent period commensurate with the estimated expected life of the Company’s stock options. The expected life of an award is based on historical experience and on the terms and conditions of the stock awards granted to employees. The interest rate assumption is based upon observed Treasury yield curve rates appropriate for the expected life of the Company’s stock options.
Income Tax, Policy [Policy Text Block]	Income Taxes – The Company's provision for income tax comprises its current tax liability and change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities. The measurement of current and deferred tax assets and liabilities is based on provisions of enacted tax laws; the effect of future changes in tax laws or rates are not anticipated. Valuation allowances are provided to reduce deferred tax assets to an amount that in management’s judgment is more likely than not to be recoverable against future taxable income. No U.S. taxes are provided on earnings of non-U.S. subsidiaries, to the extent such earnings are deemed to be permanently invested. The Company's income tax calculations are based on application of the respective U.S. federal, state or foreign tax laws. The Company’s tax filings, however, are subject to audit by the respective tax authorities.  Accordingly, the Company recognizes tax liabilities based upon its estimate of whether, and the extent to which, additional taxes will be due when such estimates are more-likely-than-not to be sustained. An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. To the extent the final tax liabilities are different than the amounts originally accrued, the increases or decreases are recorded as income tax expense or benefit in the consolidated statements of operations.
Earnings Per Share, Policy [Policy Text Block]	Net Income Per Share – Basic net income per share is computed by dividing net income by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net income per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. Dilutive potential common shares consist of incremental common shares issuable upon exercise of stock options, upon vesting of restricted stock units, contingently issuable shares for all periods and assumed issuance of shares under employee stock purchase plan. No dilutive potential common shares are included in the computation of any diluted per share amount when a loss from continuing operations was reported by the Company.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Translation  — The functional currency of the Company’s foreign subsidiaries is the local currency for the respective subsidiary. The assets and liabilities are translated at the period-end exchange rate, and statements of operations are translated at the average exchange rate during the year. Gains and losses resulting from foreign currency translations are included as a component of other comprehensive income (loss). Gains and losses resulting from foreign currency transactions are included in the consolidated statement of operations.
Derivatives, Policy [Policy Text Block]	Derivative Financial Instruments — The Company operates internationally and is exposed to potentially adverse movements in foreign currency exchange rates. The Company enters into foreign currency forwards contracts to reduce the exposure to foreign currency exchange rate fluctuations on certain foreign currency denominated monetary assets and liabilities. The Company does not use foreign currency contracts for speculative or trading purposes. The Company records these forward contracts at fair value. The counterparty to these foreign currency forward contracts is a large global financial institution that the Company believes is creditworthy, and therefore, we believe the credit risk of counterparty non-performance is not significant. These foreign currency forward contracts are not designated for hedge accounting treatment. Therefore, the change in fair value of these derivatives is recorded into earnings as a component of other income (expense), net and offsets the change in fair value of the foreign currency denominated monetary assets and liabilities, which are also recorded in other income (expense), net. The duration of these forward contracts is usually between two to three months.
Legal Costs, Policy [Policy Text Block]	Litigation  — From time to time, the Company is subject to various claims and legal proceedings that arise in the ordinary course of business. The Company accrues for losses related to litigation when a potential loss is probable and the loss can be reasonably estimated in accordance with Financial Accounting Standard Board ("FASB") requirements. As of December 31, 2014, The Company is not party to any material legal proceedings, thus no loss was probable and no amount was accrued.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements —
	In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers”. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration for which the entity expects to be entitled in exchange for those goods or services. The updated standard will replace existing revenue recognition guidance under GAAP when it becomes effective. Early adoption is not permitted. The updated standard will be effective for the Company beginning January 1, 2017 and can be applied either retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption. The Company has not yet selected a transition method and is currently evaluating the impact of adopting this new accounting standard on its financial statements.
	In August 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-15, “Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern”. The new standard provides guidance around management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on our financial statements.

Note_1_Business_and_Significan1

Note 1 - Business and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Note 1 - Business and Significant Accounting Policies (Tables) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	Computer equipment (years)	3
	Software (years)	3
	Furniture, fixtures, and equipment (years)	5	-	7
	Leasehold improvements	Shorter of estimated useful life or term of lease
Allowance for Doubtful Accounts [Member]
Note 1 - Business and Significant Accounting Policies (Tables) [Line Items]
Summary of Valuation Allowance [Table Text Block]		Balance at			Charged		Deductions/		Balance
		Beginning			to Costs		Write-offs		at End
		of Period			and Expenses		of Accounts		of Period
	Allowance for doubtful accounts
	2014	$	354		$	27	$	—	$	381
	2013	$	351		$	3	$	—	$	354
	2012	$	254		$	97	$	—	$	351

Note_2_Property_and_Equipment_

Note 2 - Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]		December 31,
		2014			2013
	Computer equipment	$	9,817		$	9,969
	Software		3,369			3,441
	Furniture, fixtures, and equipment		756			734
	Leasehold improvements		1,127			1,052
	Test equipment		6,401			4,928
	Construction-in-progress		2,405			1,421
			23,875			21,545
	Accumulated depreciation and amortization		(15,043	)		(14,481	)
		$	8,832		$	7,064

Note_4_Other_Noncurrent_Liabil1

Note 4 - Other Non-current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]
Other Noncurrent Liabilities [Table Text Block]		December 31,
		2014		2013
	Non-current portion of deferred rent	$	314	$	384
	Non-current portion of deferred revenues		313		244
	Total other non-current liabilities	$	627	$	628

Note_5_Commitments_and_Conting1

Note 5 - Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Year Ending December 31,
	2015	$	1,827
	2016		1,744
	2017		1,402
	2018		794
	2019		58
	Total future minimum lease payments	$	5,825

Note_6_Stockholders_Equity_Tab

Note 6 - Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]		Years Ended December 31,
		2014			2013			2012
	Cost of Design-to-silicon-yield solutions	$	3,419		$	2,736		$	1,786
	Research and development		1,709			1,583			1,083
	Selling, general and administrative		3,419			2,374			2,022
	Stock-based compensation expense	$	8,547		$	6,693		$	4,891
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]		Stock Plans									Employee Stock
											Purchase Plan
		2014			2013			2012			2014			2013			2012
	Expected life (in years)		4.6			4.8			4.8			1.25			1.25			1.25
	Volatility		44	%		54.1	%		59.2	%		33.4	%		45.3	%		51.6	%
	Risk-free interest rate		1.54	%		1.03	%		0.77	%		0.21	%		0.19	%		0.18	%
	Expected dividend		—			—			—			—			—			—
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]		Outstanding Options
		Number of			Weighted			Weighted			Aggregate
		Options			Average			Average			Intrinsic Value
		(in thousands)			Exercise Price			Remaining			(in thousands)
					per Share			Contractual
								Term (years)
	Outstanding, January 1, 2012		3,872			5.91
	Granted (weighted average fair value of $4.38 per share)		1,216			8.8
	Exercised		(1,019	)		5.42
	Canceled		(216	)		6.34
	Expired		(43	)		9.78
	Outstanding, December 31, 2012		3,810			6.91
	Granted (weighted average fair value of $7.75 per share)		77			17.12
	Exercised		(871	)		6.13
	Canceled		(114	)		8.76
	Expired		(22	)		5.98
	Outstanding, December 31, 2013		2,880			7.35
	Granted (weighted average fair value of $6.66 per share)		28			17.4
	Exercised		(509	)		6.33
	Canceled		(40	)		10.03
	Expired		(7	)		7.41
	Outstanding, December 31, 2014		2,352			7.65			5.72		$	17,218
	Vested and expected to vest, December 31, 2014		2,329			7.62			5.7		$	17,103
	Exercisable, December 31, 2014		1,858			7.21			5.27		$	14,304
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]		Shares			Weighted-
		(in			Average
		thousands)			Grant-Date
					Fair Value
	Nonvested, January 1, 2012		303			7.82
	Granted		359			8.97
	Vested		(172	)		9.87
	Forfeited		(40	)		7.66
	Nonvested, December 31, 2012		450			7.97
	Granted		562			18.25
	Vested		(217	)		11.01
	Forfeited		(36	)		11.08
	Nonvested, December 31, 2013		759			14.44
	Granted		569			19.42
	Vested		(350	)		14.43
	Forfeited		(37	)		18
	Nonvested, December 31, 2014
			941			17.38

Note_7_Restructuring_Tables

Note 7 - Restructuring (Tables)	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs [Table Text Block]		Severance			Professional			Total
					and Other
					Fees
	Balances, January 1, 2012	$	—		$	—		$	—
	Restructuring charges		1,733			73			1,806
	Payments		(848	)		(62	)		(910	)
	Balances, December 31, 2012	$	885		$	11		$	896
	Restructuring charges		249			51			300
	Payments		(1,121	)		(62	)		(1,183	)
	Balances, December 31, 2013	$	13		$	—		$	13
	Restructuring charges		57			—			57
	Payments		(70	)		—			(70	)
	Balances, December 31, 2014	$	—		$	—		$	—

Note_8_Income_Taxes_Tables

Note 8 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Note 8 - Income Taxes (Tables) [Line Items]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]		Year Ended December 31,
		2014			2013			2012
		(In thousands)
	U.S.
	Current	$	3,032		$	719		$	271
	Deferred		2,882			5,432			(19,863	)
	Foreign
	Current		476			291			512
	Withholding		3,103			3,830			948
	Deferred		4			108			(197	)
	Total provision (benefit)	$	9,497		$	10,380		$	(18,329	)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]		Year Ended December 31,
		2014			2013			2012
	Federal statutory tax provision	$	9,786		$	10,958		$	6,609
	State tax provision (benefit)		56			581			(925	)
	Stock compensation expense		540			393			644
	Tax credits		(3,924	)		(5,424	)		(722	)
	Foreign tax, net		3,170			3,884			906
	Change in valuation allowance		—			—			(25,223	)
	Other		(131	)		(12	)		382
	Tax provision (benefit)	$	9,497		$	10,380		$	(18,329	)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]		December 31,
		2014			2013
	Deferred tax Assets
	Net operating loss carry forward	$	533		$	621
	Research and development and other credit carry forward		5,438			6,938
	Foreign tax credit carry forward		1			—
	Accruals deductible in different periods		3,021			3,931
	Intangible assets		5,555			6,105
	Stock-based compensation		2,861			2,491
	Valuation allowance		(5,433	)		(5,087	)
	Subtotal	$	11,976		$	14,999
	Deferred tax liabilities
	Fixed assets		(632	)		(478	)
	Net Deferred tax assets	$	11,344		$	14,521
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]		Amount
	Gross unrecognized tax benefits, January 1, 2012	$	9,644
	Increases in tax positions for current year		616
	Increase in tax positions for prior years		—
	Lapse in statute of limitations		(707	)
	Gross unrecognized tax benefits, December 31, 2012		9,553
	Increases in tax positions for current year		1,052
	Increases in tax positions for prior years		—
	Lapse in statute of limitations		(389	)
	Gross unrecognized tax benefits, December 31, 2013		10,216
	Increases in tax positions for current year		809
	Increases in tax positions for prior years		—
	Lapse in statute of limitations		(597	)
	Gross unrecognized tax benefits, December 31, 2014	$	10,428
Valuation Allowance of Deferred Tax Assets [Member]
Note 8 - Income Taxes (Tables) [Line Items]
Summary of Valuation Allowance [Table Text Block]		Balance at			Charged			Deductions/			Balance
		Beginning			to Costs			Write-offs			at End
		of Period			and Expenses			of Accounts			of Period
	Valuation allowance for deferred tax assets
	2014	$	5,087		$	346		$	—		$	5,433
	2013		4,708			379			—			5,087
	2012		30,731			—			(26,023	)		4,708

Note_9_Net_Income_Per_Share_Ta

Note 9 - Net Income Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]		Year Ended December 31,
		2014		2013		2012
	Numerator:
	Net income	$	18,462	$	20,929	$	37,211
	Numerator:
	Basic weighted-average shares outstanding		30,743		29,826		28,700
	Effect of dilutive options and restricted stock		1,196		1,567		1,109
	Diluted weighted-average shares outstanding		31,939		31,393		29,809
	Net income per share - Basic	$	0.6	$	0.7	$	1.3
	Net income per share - Diluted	$	0.58	$	0.67	$	1.25
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]		December 31,
		2014		2013
	Outstanding options		61		49
	Nonvested shares of restricted stock units		19		4
	Employee Stock Purchase Plan		50		7
	Total		130		60

Note_10_Customer_and_Geographi1

Note 10 - Customer and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]		Year Ended December 31,
	Customer	2014			2013			2012
	A		52	%		33	%		40	%
	B		16	%		17	%		20	%
	C		11	%		24	%		13	%
Schedule of Receivables by Major Customers [Table Text Block]		December 31,
	Customer	2014			2013
	A		51	%		36	%
	B		21	%		17	%
	C		*			23	%
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]		Year Ended December 31,
		2014						2013						2012
		Revenues			Percentage of			Revenues			Percentage of			Revenues		Percentage of
					Revenues						Revenues					Revenues
	United States	$	44,963			44	%	$	39,057			38	%	$	35,509		40	%
	Germany		35,142			35			22,431			22			25,928		29
	South Korea		5,667			6			20,953			21			9,160		10
	Japan		3,789			4			8,340			8			8,514		10
	Rest of the world		10,602			11			10,672			11			10,429		11
	Total revenue	$	100,163			100	%	$	101,453			100	%	$	89,540		100	%
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]		December 31,
		2014			2013
	United States	$	8,240		$	6,578
	Rest of the world		592			486
	Total long-lived assets, net	$	8,832		$	7,064

Note_11_Financial_Instruments_

Note 11 - Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	Assets	Total		Quoted Prices in		Significant Other		Significant
				Active Markets for		Observable Inputs		Unobservable Inputs
				Identical Assets		(Level 2)		(Level 3)
				(Level 1)
	Money market mutual funds	$	26,356	$	26,356	$	—	$	—
	Assets	Total		Quoted Prices in		Significant Other		Significant
				Active Markets for		Observable Inputs		Unobservable Inputs
				Identical Assets		(Level 2)		(Level 3)
				(Level 1)
	Money market mutual funds	$	26,353	$	26,353	$	—	$	—

Note_13_Selected_Quarterly_Fin1

Note 13 - Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]		Year Ended December 31, 2014
		Q1		Q2		Q3		Q4
		(In thousands, except for per share amounts)
	Total revenues	$	27,086	$	24,610	$	22,406	$	26,061
	Gross profit	$	17,381	$	15,763	$	10,792	$	16,513
	Net income	$	6,255	$	4,696	$	1,761	$	5,750
	Net income per share:
	Basic	$	0.21	$	0.15	$	0.06	$	0.19
	Diluted	$	0.2	$	0.15	$	0.05	$	0.18
		Year Ended December 31, 2013
		Q1		Q2		Q3		Q4
		(In thousands, except for per share amounts)
	Total revenues	$	24,110	$	24,776	$	25,489	$	27,078
	Gross profit	$	14,453	$	15,035	$	14,982	$	17,513
	Net income	$	4,731	$	4,552	$	4,824	$	6,822
	Net income per share:
	Basic	$	0.16	$	0.15	$	0.16	$	0.23
	Diluted	$	0.15	$	0.15	$	0.15	$	0.21

Note_1_Business_and_Significan2

Note 1 - Business and Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Note 1 - Business and Significant Accounting Policies (Details) [Line Items]
Deferred Pre Contract Costs	100,000	700,000
Impairment of Deferred Costs	1,892,000
Number of Impaired Contracts	2
Unbilled Receivables, Current	9,700,000	8,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 1 - Business and Significant Accounting Policies (Details) [Line Items]
Concentration Risk, Percentage	80.00%	76.00%
Accounts Receivable [Member]
Note 1 - Business and Significant Accounting Policies (Details) [Line Items]
Concentration Risk, Percentage	10.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Note 1 - Business and Significant Accounting Policies (Details) [Line Items]
Concentration Risk, Percentage	79.00%	74.00%
Customer Concentration Risk [Member]
Note 1 - Business and Significant Accounting Policies (Details) [Line Items]
Concentration Risk, Percentage	10.00%

Note_1_Business_and_Significan3

Note 1 - Business and Significant Accounting Policies (Details) - Estimated Useful Lives - Property and Equipment	12 Months Ended
	Dec. 31, 2014
Note 1 - Business and Significant Accounting Policies (Details) - Estimated Useful Lives - Property and Equipment [Line Items]
Leasehold improvements	Computer equipment (years)	3
	Software (years)	3
	Furniture, fixtures, and equipment (years)	5	-	7
	Leasehold improvements	Shorter of estimated useful life or term of lease
Computer Equipment [Member] | Minimum [Member]
Note 1 - Business and Significant Accounting Policies (Details) - Estimated Useful Lives - Property and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Software [Member] | Minimum [Member]
Note 1 - Business and Significant Accounting Policies (Details) - Estimated Useful Lives - Property and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Furniture and Fixtures [Member] | Minimum [Member]
Note 1 - Business and Significant Accounting Policies (Details) - Estimated Useful Lives - Property and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Note 1 - Business and Significant Accounting Policies (Details) - Estimated Useful Lives - Property and Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Leasehold Improvements [Member] | Minimum [Member]
Note 1 - Business and Significant Accounting Policies (Details) - Estimated Useful Lives - Property and Equipment [Line Items]
Leasehold improvements	Shorter of estimated useful life or term of lease

Note_1_Business_and_Significan4

Note 1 - Business and Significant Accounting Policies (Details) - Allowance for Doubtful Accounts (Allowance for Doubtful Accounts [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation Allowance [Line Items]
Balance at Beginning of Period	$354	$351	$254
Charged to Costs and Expenses	27	3	97
Balance at End of Period	$381	$354	$351

Note_2_Property_and_Equipment_1

Note 2 - Property and Equipment (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Depreciation, Depletion and Amortization, Nonproduction	$2	$1.40	$0.50

Note_2_Property_and_Equipment_2

Note 2 - Property and Equipment (Details) - Property and Equipment (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property and Equipment [Abstract]
Computer equipment	$9,817	$9,969
Software	3,369	3,441
Furniture, fixtures, and equipment	756	734
Leasehold improvements	1,127	1,052
Test equipment	6,401	4,928
Construction-in-progress	2,405	1,421
	23,875	21,545
Accumulated depreciation and amortization	-15,043	-14,481
	$8,832	$7,064

Note_3_Intangible_Assets_Detai

Note 3 - Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Text Block [Abstract]
Intangible Assets, Net (Excluding Goodwill)	$0	$31,000
Amortization of Intangible Assets	$31,000	$74,000	$434,000

Note_4_Other_Noncurrent_Liabil2

Note 4 - Other Non-current Liabilities (Details) - Other Noncurrent Liabilities (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other Noncurrent Liabilities [Abstract]
Non-current portion of deferred rent	$314	$384
Non-current portion of deferred revenues	313	244
Total other non-current liabilities	$627	$628

Note_5_Commitments_and_Conting2

Note 5 - Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense, Net	$2,100,000	$2,000,000	$2,200,000
Purchase Obligation, Due in Next Twelve Months	3,100,000
Loss Contingency Accrual	$0

Note_5_Commitments_and_Conting3

Note 5 - Commitments and Contingencies (Details) - Future Minimum Lease Payments Under Noncancelable Operating Leases (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Future Minimum Lease Payments Under Noncancelable Operating Leases [Abstract]
2015	$1,827
2016	1,744
2017	1,402
2018	794
2019	58
Total future minimum lease payments	$5,825

Note_6_Stockholders_Equity_Det

Note 6 - Stockholders' Equity (Details) (USD $)	9 Months Ended	12 Months Ended			36 Months Ended	60 Months Ended	26 Months Ended	3 Months Ended	37 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 19, 2010	Oct. 29, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	27-May-14	Dec. 31, 2011	Oct. 29, 2007	Nov. 08, 2012	Oct. 21, 2014
Note 6 - Stockholders' Equity (Details) [Line Items]
Allocated Share-based Compensation Expense		$8,547,000	$6,693,000	$4,891,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)										6,550,000
Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate (in Shares)	1.33
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in Shares)		40,000	114,000	216,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)		2,352,000	2,880,000	3,810,000			2,352,000	2,352,000	2,352,000		3,872,000
Share Price (in Dollars per share)		$14.86					$14.86	$14.86	14.86
Number Of ESPP Shares Available For Future Issuance (in Shares)		4,500,000					4,500,000	4,500,000	4,500,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)		114,000	184,000	201,000
Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased (in Dollars per share)		$12.62	$7.16	$4.86
Share-based Compensation		8,547,000	6,693,000	4,891,000
Treasury Stock, Value, Acquired, Cost Method		3,566,000		4,368,000
Stock Appreciation Rights (SARs) [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Allocated Share-based Compensation Expense		34,000	102,000
Employee Stock Option [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		6,700,000	11,900,000	5,800,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		2,100,000	4,100,000				2,100,000	2,100,000	2,100,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		1 year 131 days	2 years 25 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		2,200,000	2,900,000
Number Of ESPP Shares Available For Future Issuance (in Shares)		1,200,000					1,200,000	1,200,000	1,200,000
Restricted Stock [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years 229 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options		13,800,000					13,800,000	13,800,000	13,800,000
Stock Repurchase Program [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Stock Repurchase Program, Authorized Amount					10,000,000							10,000,000
Stock Repurchase Program, Period in Force					3 years
Stock Repurchase Program, Remaining Authorized Repurchase Amount					19,300,000
Treasury Stock, Shares, Acquired (in Shares)						3,800,000
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)						$4.53
Treasury Stock, Value, Acquired, Cost Method						17,000,000
Stock Repurchase Program Adopted in November 2012 [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Stock Repurchase Program, Authorized Amount													20,000,000
Treasury Stock, Shares, Acquired (in Shares)							230,311
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)							$17.56
Treasury Stock, Value, Acquired, Cost Method							4,000,000
Stock Repurchase Program Adopted in October 2014 [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Stock Repurchase Program, Authorized Amount														25,000,000
Treasury Stock, Shares, Acquired (in Shares)								0
Shares Previously Issued Under the 2001 Plan [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)										3,500,000
2011 Stock Incentive Plan [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Expiration Term	10 years
Common Stock, Capital Shares Reserved for Future Issuance (in Shares)		7,000,000					7,000,000	7,000,000	7,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)	4,000,000
IDS Plan [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Share Based Compensation Arrangement By Share Based Payment Award Expiration Term		10 years
2001 Stock Incentive Plan [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in Shares)									400,000
Outside of the 2011, 2001, or IDS Plans [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)		0					0	0	0
Employee Stock Purchase Plan [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		255 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options		200,000					200,000	200,000	200,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate		10.00%					10.00%	10.00%	10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent		85.00%
ESPP Maximum Annual Share Replenishment (in Shares)		675,000
ESPP Maximum Annual Share Replenishment Percentage Of Prior Year Outstanding Company Common Stock		2.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)		$6.41	$5.56	$3
Share-based Compensation		$600,000	$600,000	$400,000

Note_6_Stockholders_Equity_Det1

Note 6 - Stockholders' Equity (Details) - Allocation of Recognized Period Costs (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	$8,547,000	$6,693,000	$4,891,000
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	3,419,000	2,736,000	1,786,000
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	1,709,000	1,583,000	1,083,000
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	$3,419,000	$2,374,000	$2,022,000

Note_6_Stockholders_Equity_Det2

Note 6 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Stock Option [Member]
Note 6 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]
Expected life (in years)	4 years 219 days	4 years 292 days	4 years 292 days
Volatility	44.00%	54.10%	59.20%
Risk-free interest rate	1.54%	1.03%	0.77%
Expected dividend	0.00%	0.00%	0.00%
Employee Stock Purchase Plan [Member]
Note 6 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]
Expected life (in years)	1 year 3 months	1 year 3 months	1 year 3 months
Volatility	33.40%	45.30%	51.60%
Risk-free interest rate	0.21%	0.19%	0.18%
Expected dividend	0.00%	0.00%	0.00%

Note_6_Stockholders_Equity_Det3

Note 6 - Stockholders' Equity (Details) - Stock Options Activity (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options Activity [Abstract]
Outstanding - Number of Options	2,880	3,810	3,872
Outstanding - Weighted Average Exercise Price per Share	$7.35	$6.91	$5.91
Outstanding - Weighted Average Remaining Contractual Term	5 years 262 days
Vested and expected to vest, December 31, 2014	2,329
Vested and expected to vest, December 31, 2014	$7.62
Vested and expected to vest, December 31, 2014	5 years 255 days
Vested and expected to vest, December 31, 2014	$17,103
Exercisable, December 31, 2014	1,858
Exercisable, December 31, 2014	$7.21
Exercisable, December 31, 2014	5 years 98 days
Exercisable, December 31, 2014	14,304
Granted - Number of Options	28	77	1,216
Granted - Weighted Average Exercise Price per Share	$17.40	$17.12	$8.80
Exercised - Number of Options	-509	-871	-1,019
Exercised - Weighted Average Exercise Price per Share	$6.33	$6.13	$5.42
Canceled - Number of Options	-40	-114	-216
Canceled - Weighted Average Exercise Price per Share	$10.03	$8.76	$6.34
Expired - Number of Options	-7	-22	-43
Expired - Weighted Average Exercise Price per Share	$7.41	$5.98	$9.78
Outstanding - Number of Options	2,352	2,880	3,810
Outstanding - Weighted Average Exercise Price per Share	$7.65	$7.35	$6.91
Outstanding - Weighted Average Remaining Contractual Term	5 years 262 days
Outstanding - Aggregate Intrinsic Value	$17,218

Note_6_Stockholders_Equity_Det4

Note 6 - Stockholders' Equity (Details) - Stock Options Activity (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options Activity [Abstract]
Granted, weighted average fair value	$6.66	$7.75	$4.38

Note_6_Stockholders_Equity_Det5

Note 6 - Stockholders' Equity (Details) - Nonvested Restricted Stock Units Activity (Restricted Stock Units (RSUs) [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Note 6 - Stockholders' Equity (Details) - Nonvested Restricted Stock Units Activity [Line Items]
Nonvested Balance, Shares	759	450	303
Nonvested Balance, Weighted-average Grant-date Fair Value	$14.44	$7.97	$7.82
Granted, Shares	569	562	359
Granted, Weighted-average Grant-date Fair Value	$19.42	$18.25	$8.97
Vested, Shares	-350	-217	-172
Vested, Weighted-average Grant-date Fair Value	$14.43	$11.01	$9.87
Forfeited, Shares	-37	-36	-40
Forfeited, Weighted-average Grant-date Fair Value	$18	$11.08	$7.66
Nonvested Balance, Shares	941	759	450
Nonvested Balance, Weighted-average Grant-date Fair Value	$17.38	$14.44	$7.97

Note_7_Restructuring_Details

Note 7 - Restructuring (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 7 - Restructuring (Details) [Line Items]
Restructuring Charges	$57,000	$197,000	$1,889,000
Restructuring Reserve	0
Employee Severance [Member] | October 2012 Plan [Member]
Note 7 - Restructuring (Details) [Line Items]
Restructuring Charges	57,000	249,000	1,733,000
Restructuring Reserve		13,000	885,000
Restructuring and Related Cost, Cost Incurred to Date	2,100,000
October 2012 Plan [Member]
Note 7 - Restructuring (Details) [Line Items]
Restructuring Charges	57,000	300,000	1,806,000
Restructuring Reserve		13,000	896,000
Restructuring and Related Cost, Cost Incurred to Date	$2,200,000

Note_7_Restructuring_Details_S

Note 7 - Restructuring (Details) - Summary of Restructuring Liabilities (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$57,000	$197,000	$1,889,000
Balances,	0
October 2012 Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Balances,	13,000	885,000
Restructuring charges	57,000	249,000	1,733,000
Payments	-70,000	-1,121,000	-848,000
Balances,		13,000	885,000
October 2012 Plan [Member] | Professional and Other Fees [Member]
Restructuring Cost and Reserve [Line Items]
Balances,		11,000
Restructuring charges		51,000	73,000
Payments		-62,000	-62,000
Balances,			11,000
October 2012 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Balances,	13,000	896,000
Restructuring charges	57,000	300,000	1,806,000
Payments	-70,000	-1,183,000	-910,000
Balances,		$13,000	$896,000

Note_8_Income_Taxes_Details

Note 8 - Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 8 - Income Taxes (Details) [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$26,200,000	$29,600,000	$17,700,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	1,800,000	1,700,000	1,200,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			-19,900,000
Deferred Tax Assets, Valuation Allowance	5,433,000	5,087,000
Deferred Tax Assets, Net	11,344,000	14,521,000
Deferred Tax Assets, Net, Current	3,300,000	5,900,000
Deferred Tax Assets, Net, Noncurrent	8,000,000	8,600,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	467,000	466,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	1,000	39,000	-16,000
Unrecognized Tax Benefits	10,428,000	10,216,000	9,553,000	9,644,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6,300,000	6,300,000
Unrecognized Tax Benefits In Long Term Liabilities	2,600,000
Unrecognized Tax Benefits In Deferred Tax Assets	8,300,000
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	4,100,000
Undistributed Earnings of Foreign Subsidiaries	4,800,000
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Note 8 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	6,200,000
Deferred Tax Assets, Valuation Allowance	5,400,000	5,100,000
State and Local Jurisdiction [Member]
Note 8 - Income Taxes (Details) [Line Items]
Tax Credit Carryforward, Amount	12,400,000
Unrecorded Windfall Deductions	66,000
Excluded Windfall Deductions		78,000
Domestic Tax Authority [Member]
Note 8 - Income Taxes (Details) [Line Items]
Tax Credit Carryforward, Amount	9,200,000
Unrecorded Windfall Deductions	5,100,000
Excluded Windfall Deductions		$4,900,000

Note_8_Income_Taxes_Details_In

Note 8 - Income Taxes (Details) - Income Tax Expense (Benefit) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S.
Current	$3,032	$719	$271
Deferred	2,882	5,432	-19,863
Foreign
Current	476	291	512
Withholding	3,103	3,830	948
Deferred	4	108	-197
Total provision (benefit)	$9,497	$10,380	($18,329)

Note_8_Income_Taxes_Details_In1

Note 8 - Income Taxes (Details) - Income Tax Reconciliation (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Reconciliation [Abstract]
Federal statutory tax provision	$9,786	$10,958	$6,609
State tax provision (benefit)	56	581	-925
Stock compensation expense	540	393	644
Tax credits	-3,924	-5,424	-722
Foreign tax, net	3,170	3,884	906
Change in valuation allowance			-25,223
Other	-131	-12	382
Tax provision (benefit)	$9,497	$10,380	($18,329)

Note_8_Income_Taxes_Details_De

Note 8 - Income Taxes (Details) - Deferred Tax Assets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax Assets
Net operating loss carry forward	$533	$621
Research and development and other credit carry forward	5,438	6,938
Foreign tax credit carry forward	1
Accruals deductible in different periods	3,021	3,931
Intangible assets	5,555	6,105
Stock-based compensation	2,861	2,491
Valuation allowance	-5,433	-5,087
Subtotal	11,976	14,999
Deferred tax liabilities
Fixed assets	-632	-478
Net Deferred tax assets	$11,344	$14,521

Note_8_Income_Taxes_Details_Un

Note 8 - Income Taxes (Details) - Unrecognized Tax Benefits (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unrecognized Tax Benefits [Abstract]
Gross unrecognized tax benefits,	$10,216	$9,553	$9,644
Increases in tax positions for current year	809	1,052	616
Lapse in statute of limitations	-597	-389	-707
Gross unrecognized tax benefits,	$10,428	$10,216	$9,553

Note_8_Income_Taxes_Details_Va

Note 8 - Income Taxes (Details) - Valuation Allowance of Deferred Tax Assets (Valuation Allowance of Deferred Tax Assets [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation Allowance of Deferred Tax Assets [Member]
Valuation allowance for deferred tax assets
Balance at Beginning of Period	$5,087	$4,708	$30,731
Charged to Costs and Expenses	346	379
Deductions/Write-offs of Accounts			-26,023
Balance at End of Period	$5,433	$5,087	$4,708

Note_9_Net_Income_Per_Share_De

Note 9 - Net Income Per Share (Details) - Calculation of Earnings Per Share (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income (in Dollars)	$5,750	$1,761	$4,696	$6,255	$6,822	$4,824	$4,552	$4,731	$18,462	$20,929	$37,211
Numerator:
Basic weighted-average shares outstanding									30,743	29,826	28,700
Effect of dilutive options and restricted stock									1,196	1,567	1,109
Diluted weighted-average shares outstanding									31,939	31,393	29,809
Net income per share - Basic (in Dollars per share)	$0.19	$0.06	$0.15	$0.21	$0.23	$0.16	$0.15	$0.16	$0.60	$0.70	$1.30
Net income per share - Diluted (in Dollars per share)	$0.18	$0.05	$0.15	$0.20	$0.21	$0.15	$0.15	$0.15	$0.58	$0.67	$1.25

Note_9_Net_Income_Per_Share_De1

Note 9 - Net Income Per Share (Details) - Antidilutive Securities	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities	130	60
Equity Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities	61	49
Restricted Stock Units (RSUs), Nonvested [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities	19	4
Employee Stock Purchase Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities	50	7

Note_10_Customer_and_Geographi2

Note 10 - Customer and Geographic Information (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Note 10 - Customer and Geographic Information (Details) [Line Items]
Number of Operating Segments	1
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 10 - Customer and Geographic Information (Details) [Line Items]
Concentration Risk, Percentage	80.00%	76.00%
Accounts Receivable [Member]
Note 10 - Customer and Geographic Information (Details) [Line Items]
Concentration Risk, Percentage	10.00%
Customer Concentration Risk [Member]
Note 10 - Customer and Geographic Information (Details) [Line Items]
Concentration Risk, Percentage	10.00%

Note_10_Customer_and_Geographi3

Note 10 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers (Customer Concentration Risk [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue, Major Customer [Line Items]
Revenue Percentage by Major Customer	10.00%
Customer A [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Revenue Percentage by Major Customer	52.00%	33.00%	40.00%
Customer B [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Revenue Percentage by Major Customer	16.00%	17.00%	20.00%
Customer C [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Revenue Percentage by Major Customer	11.00%	24.00%	13.00%
Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Revenue Percentage by Major Customer	79.00%	74.00%

Note_10_Customer_and_Geographi4

Note 10 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Customer A [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 10 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]
Receivables Percentage by Major Customer	51.00%		36.00%
Customer B [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 10 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]
Receivables Percentage by Major Customer	21.00%		17.00%
Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 10 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]
Receivables Percentage by Major Customer		[1]	23.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 10 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]
Receivables Percentage by Major Customer	80.00%		76.00%
Accounts Receivable [Member]
Note 10 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]
Receivables Percentage by Major Customer	10.00%
Customer Concentration Risk [Member]
Note 10 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]
Receivables Percentage by Major Customer	10.00%
[1]	represents less than 10%

Note_10_Customer_and_Geographi5

Note 10 - Customer and Geographic Information (Details) - Revenues by Geographic Area (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 10 - Customer and Geographic Information (Details) - Revenues by Geographic Area [Line Items]
Revenues	$26,061	$22,406	$24,610	$27,086	$27,078	$25,489	$24,776	$24,110	$100,163	$101,453	$89,540
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | UNITED STATES
Note 10 - Customer and Geographic Information (Details) - Revenues by Geographic Area [Line Items]
Revenues									44,963	39,057	35,509
Concentration Risk Percentage									44.00%	38.00%	40.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | GERMANY
Note 10 - Customer and Geographic Information (Details) - Revenues by Geographic Area [Line Items]
Revenues									35,142	22,431	25,928
Concentration Risk Percentage									35.00%	22.00%	29.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | KOREA, REPUBLIC OF
Note 10 - Customer and Geographic Information (Details) - Revenues by Geographic Area [Line Items]
Revenues									5,667	20,953	9,160
Concentration Risk Percentage									6.00%	21.00%	10.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | JAPAN
Note 10 - Customer and Geographic Information (Details) - Revenues by Geographic Area [Line Items]
Revenues									3,789	8,340	8,514
Concentration Risk Percentage									4.00%	8.00%	10.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | Rest of the World [Member]
Note 10 - Customer and Geographic Information (Details) - Revenues by Geographic Area [Line Items]
Revenues									10,602	10,672	10,429
Concentration Risk Percentage									11.00%	11.00%	11.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Note 10 - Customer and Geographic Information (Details) - Revenues by Geographic Area [Line Items]
Revenues									$100,163	$101,453	$89,540
Concentration Risk Percentage									100.00%	100.00%	100.00%

Note_10_Customer_and_Geographi6

Note 10 - Customer and Geographic Information (Details) - Long-lived Assets by Geographic Area (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Note 10 - Customer and Geographic Information (Details) - Long-lived Assets by Geographic Area [Line Items]
Long-lived assets, net, by geographical area	$8,832	$7,064
North America [Member]
Note 10 - Customer and Geographic Information (Details) - Long-lived Assets by Geographic Area [Line Items]
Long-lived assets, net, by geographical area	8,240	6,578
Rest of the World [Member]
Note 10 - Customer and Geographic Information (Details) - Long-lived Assets by Geographic Area [Line Items]
Long-lived assets, net, by geographical area	$592	$486

Note_11_Financial_Instruments_1

Note 11 - Financial Instruments (Details) (Foreign Exchange Contract [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Note 11 - Financial Instruments (Details) [Line Items]
Derivative Asset, Notional Amount	$6,700,000
Other Nonoperating Income (Expense) [Member]
Note 11 - Financial Instruments (Details) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	-900,000	100,000
Other Current Liabilities [Member]
Note 11 - Financial Instruments (Details) [Line Items]
Derivative Liability, Current	$50,000

Note_11_Financial_Instruments_2

Note 11 - Financial Instruments (Details) - Fair Value, Assets Measured on Recurring Basis (Money Market Mutual Funds [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Note 11 - Financial Instruments (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]
Money market mutual funds	$26,356	$26,353
Fair Value, Inputs, Level 1 [Member]
Note 11 - Financial Instruments (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]
Money market mutual funds	$26,356	$26,353

Note_12_Employee_Benefit_Plan_

Note 12 - Employee Benefit Plan (Details)	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	15.00%

Note_13_Selected_Quarterly_Fin2

Note 13 - Selected Quarterly Financial Data (Unaudited) (Details) - Selected Quarterly Financial Data (Unaudited) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Financial Data (Unaudited) [Abstract]
Total revenues	$26,061	$22,406	$24,610	$27,086	$27,078	$25,489	$24,776	$24,110	$100,163	$101,453	$89,540
Gross profit	16,513	10,792	15,763	17,381	17,513	14,982	15,035	14,453	60,449	61,983	53,043
Net income	$5,750	$1,761	$4,696	$6,255	$6,822	$4,824	$4,552	$4,731	$18,462	$20,929	$37,211
Basic (in Dollars per share)	$0.19	$0.06	$0.15	$0.21	$0.23	$0.16	$0.15	$0.16	$0.60	$0.70	$1.30
Diluted (in Dollars per share)	$0.18	$0.05	$0.15	$0.20	$0.21	$0.15	$0.15	$0.15	$0.58	$0.67	$1.25