PDF Solutions (PDFS) 10-Q 4 Aug 16 2016 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 28, 2016
Document Information [Line Items]
Entity Registrant Name	PDF SOLUTIONS INC
Entity Central Index Key	1,120,914
Trading Symbol	pdfs
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		31,341,201
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 122,222,000	$ 126,158,000
Accounts receivable, net of allowance of $200 and $299, respectively	34,786,000	33,438,000
Prepaid expenses and other current assets	4,728,000	3,655,000
Total current assets	161,736,000	163,251,000
Property and equipment, net	16,076,000	11,325,000
Deferred tax assets	10,106,000	10,299,000
Goodwill	215,000	215,000
Intangible assets, net	4,603,000	5,028,000
Other non-current assets	9,497,000	1,651,000
Total assets	202,233,000	191,769,000
Current liabilities:
Accounts payable	2,469,000	1,293,000
Accrued compensation and related benefits	5,150,000	4,812,000
Accrued and other current liabilities	2,924,000	2,382,000
Deferred revenues – current portion	5,740,000	4,702,000
Billings in excess of recognized revenue	312,000	1,267,000
Total current liabilities	16,595,000	14,456,000
Long-term income taxes payable	2,594,000	2,540,000
Other non-current liabilities	328,000	466,000
Total liabilities	19,517,000	17,462,000
Commitments and contingencies (Note 9)
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 37,880 and 37,476, respectively; shares outstanding 31,311 and 31,111, respectively	5,000	5,000
Additional paid-in-capital	272,886,000	266,008,000
Treasury stock at cost, 6,569 and 6,365 shares in 2016 and 2015, respectively	(53,301,000)	(50,383,000)
Accumulated deficit	(35,504,000)	(39,780,000)
Accumulated other comprehensive loss	(1,370,000)	(1,543,000)
Total stockholders’ equity	182,716,000	174,307,000
Total liabilities and stockholders’ equity	$ 202,233,000	$ 191,769,000

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accounts receivable, allowance	$ 200	$ 299
Preferred stock, par value (in dollars per share)	$ 0.00015	$ 0.00015
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.00015	$ 0.00015
Common stock, shares authorized (in shares)	70,000,000	70,000,000
Common stock, shares issued (in shares)	37,880,000	37,476,000
Common stock, shares outstanding (in shares)	31,311,000	31,111,000
Treasury stock, shares (in shares)	6,569,000	6,365,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Design-to-silicon-yield solutions	$ 20,574	$ 14,159	$ 39,152	$ 32,311
Gainshare performance incentives	6,114	9,051	12,617	17,716
Total revenues	26,688	23,210	51,769	50,027
Costs of Design-to-silicon-yield solutions:
Direct costs of Design-to-silicon-yield solutions	10,558	9,888	20,668	18,692
Amortization of acquired technology	96		192
Total cost of Design-to-silicon-yield solutions	10,654	9,888	20,860	18,692
Gross profit	16,034	13,322	30,909	31,335
Operating expenses:
Research and development	7,060	4,437	13,371	8,525
Selling, general and administrative	5,094	5,216	10,218	9,672
Amortization of other acquired intangible assets	117		234
Total operating expenses	12,271	9,653	23,823	18,197
Income from operations	3,763	3,669	7,086	13,138
Interest and other income (expense), net	(51)	52	(287)	103
Income before income taxes	3,712	3,721	6,799	13,241
Income tax provision	1,498	1,572	2,523	5,125
Net income	$ 2,214	$ 2,149	$ 4,276	$ 8,116
Net income per share:
Basic (in dollars per share)	$ 0.07	$ 0.07	$ 0.14	$ 0.26
Diluted (in dollars per share)	$ 0.07	$ 0.07	$ 0.13	$ 0.25
Weighted average common shares:
Basic (in shares)	31,276	31,522	31,222	31,429
Diluted (in shares)	32,023	32,400	31,872	32,345
Net income	$ 2,214	$ 2,149	$ 4,276	$ 8,116
Other comprehensive income:
Foreign currency translation adjustments, net of tax	(186)	146	173	(602)
Comprehensive income	$ 2,028	$ 2,295	$ 4,449	$ 7,514

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net income	$ 4,276,000	$ 8,116,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,624,000	1,237,000
Stock-based compensation expense	4,957,000	4,554,000
Amortization of acquired intangible assets	425,000	0
Deferred taxes	192,000	997,000
Loss on disposal of property and equipment	107,000	3,000
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	(1,075,000)	(1,052,000)
Reversal of allowance for doubtful accounts	(99,000)	(82,000)
Unrealized loss (gain) on foreign currency forward contract	(34,000)	3,000
Tax benefit related to stock-based compensation expense	748,000	2,094,000
Excess tax benefit from stock-based compensation	(708,000)	(1,980,000)
Changes in operating assets and liabilities:
Accounts receivable	(1,249,000)	6,861,000
Prepaid expenses and other assets	(8,908,000)	(4,428,000)
Accounts payable	610,000	(39,000)
Accrued compensation and related benefits	346,000	(1,521,000)
Accrued and other liabilities	(223,000)	256,000
Deferred revenues	947,000	1,774,000
Billings in excess of recognized revenues	(955,000)
Net cash provided by operating activities	981,000	16,793,000
Investing activities:
Purchases of property and equipment	(5,051,000)	(2,388,000)
Net cash used in investing activities	(5,051,000)	(2,388,000)
Financing activities:
Proceeds from exercise of stock options	452,000	4,764,000
Proceeds from employee stock purchase plan	778,000	680,000
Excess tax benefit from stock-based compensation	708,000	1,980,000
Purchases of treasury stock	(1,843,000)	(5,571,000)
Net cash provided by financing activities	95,000	1,853,000
Effect of exchange rate changes on cash and cash equivalents	39,000	(23,000)
Net change in cash and cash equivalents	(3,936,000)	16,235,000
Cash and cash equivalents, beginning of period	126,158,000	115,464,000
Cash and cash equivalents, end of period	122,222,000	131,699,000
Supplemental disclosure of cash flow information:
Taxes	1,336,000	3,920,000
Property and equipment received and accrued in accounts payable and accrued and other liabilities	$ 1,656,000	$ 582,000

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation	6 Months Ended
	Jun. 30, 2016
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. BASIS OF PRESENTATION Basis of Presentation The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (“the Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. The interim unaudited condensed consolidated financial statements reflect, in the opinion of management, all adjustments necessary (consisting only of normal recurring adjustments), to present a fair statement of results for the interim periods presented. The operating results for any interim period are not necessarily indicative of the results that may be expected for other interim periods or the full fiscal year. The accompanying interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all intercompany balances and transactions. The condensed consolidated balance sheet at December 31, 2015, has been derived from the audited consolidated financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America. Use of Estimates Revenue Recognition Design-to-Silicon-Yield Solutions — Revenue that is derived from Design-to-silicon-yield solutions comes from services and software licenses. The Company recognizes revenue 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 percentage of completion method of contract accounting based on costs or labor-hours input method, whichever is the most appropriate measure of the progress towards completion of the contract. 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 (cumulative catch-up method). During the period ended June 30, 2016, we recognized changes in one project’s profitability from revisions in estimates due to the customer’s directed scope changes that resulted in favorable changes of in our net income for the three months and six months ended June 30, 2016 of $0.9 million or $0.03 per diluted share. 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 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 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. When software is licensed for a specified term, fees for support and maintenance are generally bundled with the license fee over the entire term of the contract. The Company is unable to establish VSOE of fair value for maintenance services that are generally bundled with term licenses. In these cases, the Company recognizes revenue ratably over the term of the contract. Revenue from Software-as-a-Service (SaaS) that allows for the use of a hosted software product or service over a contractually determined period of time without taking possession of software is accounted for as a subscription and recognized as revenue ratably over the coverage period beginning on the date the service is first made available to customers. 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 percentage of completion method of contract accounting, and such revenue is recorded as services revenue. Deferred revenues consist primarily of amounts invoiced in advance of revenue recognition and are recognized as the revenue recognition criteria are met. Deferred revenues that will be recognized during the succeeding 12-month period are recorded as current deferred revenues and the remaining portion is recorded as non- current deferred revenues. The non-current portion of deferred revenue was $0.2 million as of June 30, 2016 and $0.3 million as of December 31, 2015. This balance was recorded in the other non-current liabilities in the accompanying condensed consolidated balance sheets. 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.

Note 2 - Recent Accounting Pron

Note 2 - Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2016
Notes to Financial Statements
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	2. RECENT ACCOUNTING PRONOUNCEMENTS There have been no developments to recently issued accounting standards, including the expected dates of adoption and estimated effects on the Company’s consolidated financial statements and footnote disclosures, from those disclosed in the Company’s 2015 Annual Report on Form 10-K, except for the following: In February 2016, the Financial Accounting Standards Board (or FASB) issued Accounting Standards Update (or ASU) No. 2016-2, Leases (Topic 842). The update requires that most leases, including operating leases, be recorded on the balance sheet as an asset and a liability, initially measured at the present value of the lease payments. Subsequently, the lease asset will be amortized generally on a straight-line basis over the lease term, and the lease liability will bear interest expense and be reduced for lease payments. The amendments in this update are effective for public companies’ financial statements issued for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is currently assessing the impact that adopting this new accounting standard will have on its consolidated financial statements and footnote disclosures. In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net). This update clarifies the implementation guidance on principal versus agent considerations. The guidance includes indicators to assist an entity in determining whether it controls a specified good or service before it is transferred to the customers. The amendments in this update are effective for public companies’ financial statements issued for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently assessing the impact that adopting this new accounting standard will have on its consolidated financial statements and footnote disclosures. In March 2016, the FASB issued ASU No. 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. This standard makes several modifications to Topic 718 related to the accounting for forfeitures, employer tax withholding on share-based compensation and the financial statement presentation of excess tax benefits or deficiencies. ASU 2016-09 also clarifies the statement of cash flows presentation for certain components of share-based awards. The update is effective for interim and annual reporting periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted in any interim or annual period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. An entity that elects early adoption must adopt all of the amendments in the same period. The Company is currently assessing the impact that adopting this new accounting standard will have on its consolidated financial statements and footnote disclosures. In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing. The amendments in this update affect entities with transactions included within the scope of Topic 606. The core principle of the guidance in Topic 606 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendments in this Update do not change the core principle of the guidance in Topic 606. Rather, the amendments in this update clarify the following two aspects of Topic 606: identifying performance obligations and the licensing implementation guidance, while retaining the related principles for those areas. The amendments in this update are effective for public companies’ financial statements issued for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently assessing the impact that adopting this new accounting standard will have on its consolidated financial statements and footnote disclosures. In May 2016, the FASB issued ASU No. 2016-11, Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 pursuant to Staff announcements at the March 3, 2016 EITF Meeting. The purpose of this standard is to rescind from the FASB Accounting Standards Codification certain SEC paragraphs as a result of two SEC Staff Announcements at the March 3, 2016 meeting. The amendments in this update related to Topic 605 are effective for interim and annual reporting periods beginning after December 15, 2017 and amendments related to Topic 815 are effective for interim and annual reporting periods beginning after December 15, 2015. The Company is currently assessing the impact that adopting this new accounting standard will have on its consolidated financial statements and footnote disclosures. In May 2016, the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 660): Narrow-Scope Improvements and Practical Expedients. The purpose of this standard is to clarify certain narrow aspects of Topic 660 such as assessing the collectability criterion, presentation of sales taxes and other similar taxes collected from customers, noncash consideration, contract modifications at transition, completed contracts at transition, and technical correction. This standard is effective for interim and annual reporting periods beginning after December 15, 2017. The Company is currently assessing the impact that adopting this new accounting standard will have on its consolidated financial statements and footnote disclosures.

Note 3 - Balance Sheet Componen

Note 3 - Balance Sheet Components	6 Months Ended
	Jun. 30, 2016
Notes to Financial Statements
Supplemental Balance Sheet Disclosures [Text Block]	3. BALANCE SHEET COMPONENTS Accounts receivable include amounts that are unbilled at the end of the period that are expected to be billed and collected within 12-month period. Unbilled accounts receivable are determined on an individual contract basis. Unbilled accounts receivable, included in accounts receivable, totaled $15.4 million and $11.5 million as of June 30, 2016 and December 31, 2015, respectively. Unbilled accounts receivable that are not expected to be billed and collected during the succeeding 12-month period are recorded in other non-current assets and totaled $8.0 million and $0.1 million as of June 30, 2016 and December 31, 2015, respectively. The increase in other non-current asset is due to the increase in the long-term unbilled portion of two of the Company’s Design-to-silicon-yield solutions contracts. Deferred cost balance was $0.7 million and zero as of June 30, 2016 and 2015, respectively. Property and equipment consists of (in thousands): June 30 , 2016 December 31, 2015 Property and equipment, net: Computer equipment $ 10,209 $ 9,188 Software 1,828 1,713 Furniture, fixtures and equipment 963 907 Leasehold improvements 1,123 1,126 Test equipment 9,667 7,214 Construction-in-progress 7,432 4,777 31,222 24,925 Less: accumulated depreciation (15,146 ) (13,600 ) Total $ 16,076 $ 11,325 Depreciation and amortization expense was $0.9 million and $0.6 million for the three months ended June 30, 2016 and 2015, respectively. Depreciation and amortization expense was $1.6 million and $1.2 million for the six months ended June 30, 2016 and 2015, respectively. As of both June 30, 2016 and December 31, 2015, the carrying amount of goodwill was $0.2 million. The following is a rollforward of the Company's goodwill balance (in thousands): June 30 , 2016 Balance as of December 31, 2015 $ 215 Adjustment — Balance as of June 30, 2016 $ 215 Intangible assets balance was $4.6 million and $5.0 million as of June 30, 2016 and December 31, 2015, respectively. Intangible assets as of June 30, 2016 and December 31, 2015 consist of the following (in thousands): June 30 , 2016 December 31, 2015 Amortization Period (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Acquired identifiable intangibles: Customer relationships 1 - 9 $ 5,920 $ (3,686 ) $ 2,234 $ 5,920 $ (3,547 ) $ 2,373 Developed technology 4 - 6 14,100 (12,167 ) 1,933 14,100 (11,976 ) 2,124 Tradename 2 - 4 610 (558 ) 52 610 (533 ) 77 Backlog 1 100 (96 ) 4 100 (46 ) 54 Patent 7 - 10 1,800 (1,420 ) 380 1,800 (1,400 ) 400 Other acquired intangibles 4 255 (255 ) - 255 (255 ) - Total $ 22,785 $ (18,182 ) $ 4,603 $ 22,785 $ (17,757 ) $ 5,028 The weighted average amortization period for acquired identifiable intangible assets was 6.83 years as of June 30, 2016. For the three months ended June 30, 2016 and 2015, intangible asset amortization expense was $0.2 million and zero, respectively. For the six months ended June 30, 2016 and 2015, intangible asset amortization expense was $0.4 million and zero, respectively. The Company expects annual amortization of acquired identifiable intangible assets to be as follows (in thousands): Period Ending June 30, 2016 (remaining 6 months) $ 380 2017 728 2018 701 2019 701 2020 701 2021 and thereafter 1,392 Total future amortization expense $ 4,603 Intangible assets are amortized over their useful lives unless these lives are determined to be indefinite. 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 three and six months ended June 30, 2016, there were no indicators of impairment related to the Company’s intangible assets.

Note 4 - Stockholders' Equity

Note 4 - Stockholders' Equity	6 Months Ended
	Jun. 30, 2016
Notes to Financial Statements
Shareholders' Equity and Share-based Payments [Text Block]	4. STOCKHOLDERS’ EQUITY 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 . Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Cost of design-to-silicon yield-solutions $ 956 $ 914 $ 2,041 $ 1,801 Research and development 651 510 1,357 1,001 Selling, general and administrative 684 931 1,559 1,752 Stock-based compensation expense $ 2,291 $ 2,355 $ 4,957 $ 4,554 On June 30, 2016, the Company had the following stock-based compensation plans: Stock Plans — 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 the 2001Plan and the IDS Plan 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 plan, as applicable. The Company estimated the fair value of share-based awards granted under the Stock Plan during the period using the Black-Scholes-Merton option-pricing model with the following weighted average assumptions, resulting in the following weighted average fair values: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Expected life (in years) 4.42 4.51 4.42 4.51 Volatility 43.58 % 46.8 % 44.26 % 46.7 % Risk-free interest rate 1.30 % 1.41 % 1.25 % 1.34 % Expected dividend — — — — Weighted average fair value per share of options granted during the period $ 5.00 $ 6.61 $ 4.46 $ 6.50 As of June 30, 2016, 8.3 million shares of common stock were reserved to cover stock-based awards under the 2011 Plan, of which 4.5 million shares were available for future grant. The number of shares reserved and available under the 2011 Plan includes 0.5 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 June 30, 2016. As of June 30, 2016, there were no outstanding awards that had been granted outside of the 2011, 2001 or the IDS Plans (collectively, the "Stock Plans"). Stock option activity under the Company’s Stock Plans during the six months ended June 30, 2016, was as follows: Number of Options (in thousands) Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term (years) Aggregate Intrinsic Value (in thousands) Outstanding, January 1, 2016 1,764 $ 7.88 Granted (weighted average fair value of $4.46 per share) 50 $ 11.87 Exercised (63 ) $ 7.20 Canceled (7 ) $ 15.01 Expired (75 ) $ 13.79 Outstanding, June 30, 2016 1,669 $ 7.73 4.87 $ 10,719 Vested and expected to vest, June 30, 2016 1,660 $ 7.70 4.84 $ 10,704 Exercisable, June 30, 2016 1,523 $ 7.17 4.49 $ 10,539 The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $13.99 per share as of June 30, 2016. The total intrinsic value of options exercised during the six months ended June 30, 2016, was $0.4 million. As of June 30, 2016, there was $0.6 million of total unrecognized compensation cost related to unvested stock options. That cost is expected to be recognized over a weighted average period of 3.0 years. The total fair value of shares vested during the six months ended June 30, 2016, was $0.5 million. Nonvested restricted stock units activity during the six months ended June 30, 2016, was as follows: Shares (in thousands) Weighted Average Grant Date Fair Value Per Share Nonvested, January 1, 2016 1,166 $ 17.03 Granted 50 $ 11.87 Vested (258 ) $ 16.70 Forfeited (42 ) $ 17.27 Nonvested, June 30, 2016 916 $ 16.83 As of June 30, 2016, there was $13.6 million of total unrecognized compensation cost related to nonvested restricted stock units. That cost is expected to be recognized over a weighted average period of 2.4 years. Restricted stock units do not have rights to dividends prior to vesting. In June 2016, the Company’s Compensation Committee approved 16,375 shares of stock options and 841,533 restricted stock units to be granted effective July 1, 2016. The weighted average exercise price for the options granted is $14.14 per share. The weighted average grant date fair value per share for the restricted stock units granted is $14.14. The cost is expected to be recognized over the vesting period, generally 4 years. Employee Stock Purchase Plan The Company estimated the fair value of purchase rights granted under the Purchase Plan during the period using the Black-Scholes-Merton option-pricing model with the following weighted average assumptions, resulting in the following weighted average fair values: Six months Ended June 30 , 2016 2015 Expected life (in years) 1.25 1.25 Volatility 44.15 % 54.21 % Risk-free interest rate 0.50 % 0.26 % Expected dividend — — Weighted average fair value of purchase rights granted under the Purchase Plan $ 3.56 $ 6.19 During the three months ended June 30, 2016 and 2015, the Company did not issue any shares under the Purchase Plan. During the six months ended June 30, 2016 and 2015, a total of 84,000 and 51,000 shares, respectively, were issued at a weighted-average purchase price of $9.21 and $13.32 per share, respectively, under the Purchase Plan. As of June 30, 2016, there was $1.1 million of unrecognized compensation cost related to the Purchase Plan. That cost is expected to be recognized over a weighted average period of 1.6 years. As of June 30, 2016, 2.7 million shares were available for future issuance under the Purchase Plan. Stock Repurchase Program

Note 5 - Income Taxes

Note 5 - Income Taxes	6 Months Ended
	Jun. 30, 2016
Notes to Financial Statements
Income Tax Disclosure [Text Block]	5. INCOME TAXES Income tax provision decreased $2.6 million for the six months ended June 30, 2016, to $2.5 million as compared to an income tax provision of $5.1 million for the six months ended June 30, 2015. The Company’s effective tax rate was 37.1% and 38.7% for the six months ended June 30, 2016, and June 30, 2015, respectively. The Company’s effective tax rate decreased in the six months ended June 30, 2016, as compared to the same period in 2015, primarily due to the permanent reinstatement of the U.S. federal research tax credit. On December 18, 2015, the President of the United States signed into law the Protecting Americans from Tax Hikes Act of 2015 which permanently reinstated the research tax credit retroactive to January 1, 2015. As a result of the new legislation, the Company recognized a benefit in the first two quarters of 2016 and no benefit in the same period in 2015. The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of June 30, 2016, was $11.3 million, of which $6.7 million, if recognized, would decrease the Company’s effective tax rate. The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of December 31, 2015, was $11.0 million, of which $6.5 million, if recognized, would affect the Company's effective tax rate. As of June 30, 2016, the Company has recorded unrecognized tax benefits of $2.6 million, including interest and penalties, as long-term taxes payable in its condensed consolidated balance sheet. The remaining $9.2 million has been recorded net of our deferred tax assets, of which $4.6 million is subject to a full valuation allowance. The valuation allowance was approximately $6.4 million and $6.2 million as of June 30, 2016 and December 31, 2015, respectively, which was related to California R&D tax credits and California net operating losses related to our acquisition of Syntricity that we currently do not believe are more likely than not to be ultimately realized. 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 State of New York is currently conducting an audit of the Company’s 2012 to 2014 income tax returns. The Company is not subject to income tax examinations in any other of its major foreign subsidiaries’ jurisdictions.

Note 6 - Net Income Per Share

Note 6 - Net Income Per Share	6 Months Ended
	Jun. 30, 2016
Notes to Financial Statements
Earnings Per Share [Text Block]	6. 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): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Numerator: Net income $ 2,214 $ 2,149 $ 4,276 $ 8,116 Denominator: Basic weighted average common shares outstanding 31,276 31,522 31,222 31,429 Dilutive effect of equity incentive plans 747 878 650 916 Diluted weighted average common shares outstanding 32,023 32,400 31,872 32,345 Net income per share: Basic $ 0.07 $ 0.07 $ 0.14 $ 0.26 Diluted $ 0.07 $ 0.07 $ 0.13 $ 0.25 The following table sets forth potential shares of common stock that are not included in the diluted net income per share calculation above because to do so would be anti-dilutive for the periods indicated (in thousands): Three Months Ended June 30, Six Months Ended June 30, 201 6 2015 2016 2015 Outstanding options 230 58 264 52 Nonvested restricted stock units 348 62 798 64 Employee Stock Purchase Plan — 215 230 239 Total 578 335 1,292 355

Note 7 - Customer and Geographi

Note 7 - Customer and Geographic Information	6 Months Ended
	Jun. 30, 2016
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	7. 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 companies designing and/or manufacturing integrated circuits. The Company had revenues from individual customers in excess of 10% of total revenues as follows: Three Months Ended June 30, Six Months Ende d June 30, Customer 2016 2015 2016 2015 A 39 % 54 % 44 % 49 % B * % 16 % * % 13 % C * % * % 12 % 17 % D 13 % * % * % * % * represents less than 10% The Company had gross accounts receivable from individual customers in excess of 10% of gross accounts receivable as follows: Customer June 30 , 2016 December 31, 2015 A 50 % 65 % D 12 % * % * represents less than 10% Revenues from customers by geographic area based on the location of the customers’ work sites are as follows (in thousands): Three Months Ended June 30 , 2016 2015 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 9,518 36 % $ 11,436 49 % Taiwan 5,725 21 2,160 9 Germany 3,994 15 6,345 27 South Korea 2,184 8 627 3 Rest of the world 5,267 20 2,642 12 Total revenue $ 26,688 100 % $ 23,210 100 % Six Months Ended June 30, 2016 2015 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 21,640 42 % $ 21,750 43 % Taiwan 7,909 15 3,279 7 Germany 7,028 14 12,609 25 South Korea 5,497 11 7,545 15 Rest of the world 9,695 18 4,844 10 Total revenue $ 51,769 100 % $ 50,027 100 % Long-lived assets, net by geographic area are as follows (in thousands): June 30 , 2016 December 31, 2015 United States $ 15,559 $ 10,752 Rest of the world 517 573 Total long-lived assets, net $ 16,076 $ 11,325

Note 8 - Fair Value Measurement

Note 8 - Fair Value Measurements	6 Months Ended
	Jun. 30, 2016
Notes to Financial Statements
Fair Value Disclosures [Text Block]	8. FAIR VALUE MEASUREMENTS 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 June 30, 2016, and the basis for that measurement (in thousands): Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market mutual funds $ 26,415 $ 26,415 $ — $ — The following table represents the Company’s assets measured at fair value on a recurring basis as of December 31, 2015, and the basis for that measurement (in thousands): Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market mutual funds $ 26,371 $ 26,371 $ — $ — 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 three months ended June 30, 2016 and 2015, the Company recognized a realized loss of $0.3 million and a realized gain of $0.1 million on the contracts, respectively, which was recorded in interest and other income (expense), net in the Company’s Condensed Consolidated Statements of Operations and Comprehensive Income. For the six months ended June 30, 2016 and 2015, the Company recognized a realized gain of $8,000 and a realized loss of $0.6 million on the contracts, respectively, which was recorded in other income (expense), net in the Company’s Statements of Operations and Comprehensive Income. 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 June 30, 2016, the Company had one outstanding forward contract with a notional amount of $7.1 million and recorded $28,000 other current liabilities associated with this outstanding forward contract. As of December 31, 2015, the Company had one outstanding forward contract with a notional amount of $6.7 million and had recorded $62,000 other current liabilities associated with the outstanding forward contract.

Note 9 - Commitments and Contin

Note 9 - Commitments and Contingencies	6 Months Ended
	Jun. 30, 2016
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	9. 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 2024. Rent expense was $0.6 million and $0.5 million for the three months ended June 30, 2016 and 2015, respectively. Rent expense was $1.2 million and $1.0 million for the six months ended June 30, 2016 and 2015. Future minimum lease payments under noncancelable operating leases at June 30, 2016, are as follows (in thousands): Period Ending June 30, Amount 2016 (remaining six months) $ 1,028 2017 1,733 2018 1,087 2019 264 2020 195 2021 and thereafter 61 Total future minimum lease payments $ 4,368 Litigation

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (“the Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. The interim unaudited condensed consolidated financial statements reflect, in the opinion of management, all adjustments necessary (consisting only of normal recurring adjustments), to present a fair statement of results for the interim periods presented. The operating results for any interim period are not necessarily indicative of the results that may be expected for other interim periods or the full fiscal year. The accompanying interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all intercompany balances and transactions. The condensed consolidated balance sheet at December 31, 2015, has been derived from the audited consolidated financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition Design-to-Silicon-Yield Solutions — Revenue that is derived from Design-to-silicon-yield solutions comes from services and software licenses. The Company recognizes revenue 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 percentage of completion method of contract accounting based on costs or labor-hours input method, whichever is the most appropriate measure of the progress towards completion of the contract. 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 (cumulative catch-up method). During the period ended June 30, 2016, we recognized changes in one project’s profitability from revisions in estimates due to the customer’s directed scope changes that resulted in favorable changes of in our net income for the three months and six months ended June 30, 2016 of $0.9 million or $0.03 per diluted share. 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 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 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. When software is licensed for a specified term, fees for support and maintenance are generally bundled with the license fee over the entire term of the contract. The Company is unable to establish VSOE of fair value for maintenance services that are generally bundled with term licenses. In these cases, the Company recognizes revenue ratably over the term of the contract. Revenue from Software-as-a-Service (SaaS) that allows for the use of a hosted software product or service over a contractually determined period of time without taking possession of software is accounted for as a subscription and recognized as revenue ratably over the coverage period beginning on the date the service is first made available to customers. 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 percentage of completion method of contract accounting, and such revenue is recorded as services revenue. Deferred revenues consist primarily of amounts invoiced in advance of revenue recognition and are recognized as the revenue recognition criteria are met. Deferred revenues that will be recognized during the succeeding 12-month period are recorded as current deferred revenues and the remaining portion is recorded as non- current deferred revenues. The non-current portion of deferred revenue was $0.2 million as of June 30, 2016 and $0.3 million as of December 31, 2015. This balance was recorded in the other non-current liabilities in the accompanying condensed consolidated balance sheets. 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.

Note 3 - Balance Sheet Compon16

Note 3 - Balance Sheet Components (Tables)	6 Months Ended
	Jun. 30, 2016
Notes Tables
Property, Plant and Equipment [Table Text Block]	June 30 , 2016 December 31, 2015 Property and equipment, net: Computer equipment $ 10,209 $ 9,188 Software 1,828 1,713 Furniture, fixtures and equipment 963 907 Leasehold improvements 1,123 1,126 Test equipment 9,667 7,214 Construction-in-progress 7,432 4,777 31,222 24,925 Less: accumulated depreciation (15,146 ) (13,600 ) Total $ 16,076 $ 11,325
Schedule of Goodwill [Table Text Block]	June 30 , 2016 Balance as of December 31, 2015 $ 215 Adjustment — Balance as of June 30, 2016 $ 215
Schedule of Finite-Lived Intangible Assets [Table Text Block]	June 30 , 2016 December 31, 2015 Amortization Period (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Acquired identifiable intangibles: Customer relationships 1 - 9 $ 5,920 $ (3,686 ) $ 2,234 $ 5,920 $ (3,547 ) $ 2,373 Developed technology 4 - 6 14,100 (12,167 ) 1,933 14,100 (11,976 ) 2,124 Tradename 2 - 4 610 (558 ) 52 610 (533 ) 77 Backlog 1 100 (96 ) 4 100 (46 ) 54 Patent 7 - 10 1,800 (1,420 ) 380 1,800 (1,400 ) 400 Other acquired intangibles 4 255 (255 ) - 255 (255 ) - Total $ 22,785 $ (18,182 ) $ 4,603 $ 22,785 $ (17,757 ) $ 5,028
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Period Ending June 30, 2016 (remaining 6 months) $ 380 2017 728 2018 701 2019 701 2020 701 2021 and thereafter 1,392 Total future amortization expense $ 4,603

Note 4 - Stockholders' Equity (

Note 4 - Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2016
Notes Tables
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Cost of design-to-silicon yield-solutions $ 956 $ 914 $ 2,041 $ 1,801 Research and development 651 510 1,357 1,001 Selling, general and administrative 684 931 1,559 1,752 Stock-based compensation expense $ 2,291 $ 2,355 $ 4,957 $ 4,554
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Expected life (in years) 4.42 4.51 4.42 4.51 Volatility 43.58 % 46.8 % 44.26 % 46.7 % Risk-free interest rate 1.30 % 1.41 % 1.25 % 1.34 % Expected dividend — — — — Weighted average fair value per share of options granted during the period $ 5.00 $ 6.61 $ 4.46 $ 6.50 Six months Ended June 30 , 2016 2015 Expected life (in years) 1.25 1.25 Volatility 44.15 % 54.21 % Risk-free interest rate 0.50 % 0.26 % Expected dividend — — Weighted average fair value of purchase rights granted under the Purchase Plan $ 3.56 $ 6.19
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	Number of Options (in thousands) Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term (years) Aggregate Intrinsic Value (in thousands) Outstanding, January 1, 2016 1,764 $ 7.88 Granted (weighted average fair value of $4.46 per share) 50 $ 11.87 Exercised (63 ) $ 7.20 Canceled (7 ) $ 15.01 Expired (75 ) $ 13.79 Outstanding, June 30, 2016 1,669 $ 7.73 4.87 $ 10,719 Vested and expected to vest, June 30, 2016 1,660 $ 7.70 4.84 $ 10,704 Exercisable, June 30, 2016 1,523 $ 7.17 4.49 $ 10,539
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	Shares (in thousands) Weighted Average Grant Date Fair Value Per Share Nonvested, January 1, 2016 1,166 $ 17.03 Granted 50 $ 11.87 Vested (258 ) $ 16.70 Forfeited (42 ) $ 17.27 Nonvested, June 30, 2016 916 $ 16.83

Note 6 - Net Income Per Share (

Note 6 - Net Income Per Share (Tables)	6 Months Ended
	Jun. 30, 2016
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Numerator: Net income $ 2,214 $ 2,149 $ 4,276 $ 8,116 Denominator: Basic weighted average common shares outstanding 31,276 31,522 31,222 31,429 Dilutive effect of equity incentive plans 747 878 650 916 Diluted weighted average common shares outstanding 32,023 32,400 31,872 32,345 Net income per share: Basic $ 0.07 $ 0.07 $ 0.14 $ 0.26 Diluted $ 0.07 $ 0.07 $ 0.13 $ 0.25
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 201 6 2015 2016 2015 Outstanding options 230 58 264 52 Nonvested restricted stock units 348 62 798 64 Employee Stock Purchase Plan — 215 230 239 Total 578 335 1,292 355

Note 7 - Customer and Geograp19

Note 7 - Customer and Geographic Information (Tables)	6 Months Ended
	Jun. 30, 2016
Notes Tables
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	Three Months Ended June 30, Six Months Ende d June 30, Customer 2016 2015 2016 2015 A 39 % 54 % 44 % 49 % B * % 16 % * % 13 % C * % * % 12 % 17 % D 13 % * % * % * %
Receivables by Major Customers [Table Text Block]	Customer June 30 , 2016 December 31, 2015 A 50 % 65 % D 12 % * %
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	Three Months Ended June 30 , 2016 2015 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 9,518 36 % $ 11,436 49 % Taiwan 5,725 21 2,160 9 Germany 3,994 15 6,345 27 South Korea 2,184 8 627 3 Rest of the world 5,267 20 2,642 12 Total revenue $ 26,688 100 % $ 23,210 100 % Six Months Ended June 30, 2016 2015 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 21,640 42 % $ 21,750 43 % Taiwan 7,909 15 3,279 7 Germany 7,028 14 12,609 25 South Korea 5,497 11 7,545 15 Rest of the world 9,695 18 4,844 10 Total revenue $ 51,769 100 % $ 50,027 100 %
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	June 30 , 2016 December 31, 2015 United States $ 15,559 $ 10,752 Rest of the world 517 573 Total long-lived assets, net $ 16,076 $ 11,325

Note 8 - Fair Value Measureme20

Note 8 - Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2016
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market mutual funds $ 26,415 $ 26,415 $ — $ — Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market mutual funds $ 26,371 $ 26,371 $ — $ —

Note 9 - Commitments and Cont21

Note 9 - Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2016
Notes Tables
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Period Ending June 30, Amount 2016 (remaining six months) $ 1,028 2017 1,733 2018 1,087 2019 264 2020 195 2021 and thereafter 61 Total future minimum lease payments $ 4,368

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Decrease in Estimated Costs to Perform Obligations under Completed Contract Method [Member]
Net Income (Loss) Attributable to Parent	$ 900		$ 900
Earnings Per Share, Diluted	$ 0.03		$ 0.03
Other Noncurrent Liabilities [Member]
Deferred Revenue, Noncurrent	$ 200		$ 200		$ 300
Net Income (Loss) Attributable to Parent	$ 2,214	$ 2,149	$ 4,276	$ 8,116
Earnings Per Share, Diluted	$ 0.07	$ 0.07	$ 0.13	$ 0.25

Note 3 - Balance Sheet Compon23

Note 3 - Balance Sheet Components (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Unbilled Receivables, Current	$ 15,400,000		$ 15,400,000		$ 11,500,000
Unbilled Receivables, Not Billable, Amount Expected to be Collected after Next Twelve Months	8,000,000		8,000,000		100,000
Deferred Pre-contract Costs	700,000		700,000		0
Depreciation, Depletion and Amortization, Nonproduction	900,000	$ 600,000	1,600,000	$ 1,200,000
Goodwill	215,000		215,000		215,000
Finite-Lived Intangible Assets, Net	4,603,000		$ 4,603,000		$ 5,028,000
Finite-Lived Intangible Assets, Remaining Amortization Period			6 years 302 days
Amortization of Intangible Assets	$ 200,000	$ 0	$ 425,000	$ 0

Note 3 - Balance Sheet Compon24

Note 3 - Balance Sheet Components - Property and Equipment (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Computer Equipment [Member]
Property and equipment	$ 10,209,000	$ 9,188,000
Software and Software Development Costs [Member]
Property and equipment	1,828,000	1,713,000
Furniture and Fixtures [Member]
Property and equipment	963,000	907,000
Leasehold Improvements [Member]
Property and equipment	1,123,000	1,126,000
Test Equipment [Member]
Property and equipment	9,667,000	7,214,000
Construction in Progress [Member]
Property and equipment	7,432,000	4,777,000
Property and equipment	31,222,000	24,925,000
Less: accumulated depreciation	(15,146,000)	(13,600,000)
Total	$ 16,076,000	$ 11,325,000

Note 3 - Balance Sheet Compon25

Note 3 - Balance Sheet Components - Goodwill Activity (Details)	6 Months Ended
	Jun. 30, 2016USD ($)
Syntricity [Member]
Balance	$ 215,000
Balance	215,000
Balance	215,000
Adjustment
Balance	$ 215,000

Note 3 - Balance Sheet Compon26

Note 3 - Balance Sheet Components - Intangible Assets (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Customer Relationships [Member] | Minimum [Member]
Amortization Period	1 year
Customer Relationships [Member] | Maximum [Member]
Amortization Period	9 years
Customer Relationships [Member]
Gross Carrying Amount	$ 5,920,000	$ 5,920,000
Accumulated Amortization	(3,686,000)	(3,547,000)
Finite-Lived Intangible Assets, Net	$ 2,234,000	2,373,000
Developed Technology Rights [Member] | Minimum [Member]
Amortization Period	4 years
Developed Technology Rights [Member] | Maximum [Member]
Amortization Period	6 years
Developed Technology Rights [Member]
Gross Carrying Amount	$ 14,100,000	14,100,000
Accumulated Amortization	(12,167,000)	(11,976,000)
Finite-Lived Intangible Assets, Net	$ 1,933,000	2,124,000
Trade Names [Member] | Minimum [Member]
Amortization Period	2 years
Trade Names [Member] | Maximum [Member]
Amortization Period	4 years
Trade Names [Member]
Gross Carrying Amount	$ 610,000	610,000
Accumulated Amortization	(558,000)	(533,000)
Finite-Lived Intangible Assets, Net	$ 52,000	77,000
Order or Production Backlog [Member]
Amortization Period	1 year
Gross Carrying Amount	$ 100,000	100,000
Accumulated Amortization	(96,000)	(46,000)
Finite-Lived Intangible Assets, Net	$ 4,000	54,000
Patents [Member] | Minimum [Member]
Amortization Period	7 years
Patents [Member] | Maximum [Member]
Amortization Period	10 years
Patents [Member]
Gross Carrying Amount	$ 1,800,000	1,800,000
Accumulated Amortization	(1,420,000)	(1,400,000)
Finite-Lived Intangible Assets, Net	$ 380,000	400,000
Other Intangible Assets [Member]
Amortization Period	4 years
Gross Carrying Amount	$ 255,000	255,000
Accumulated Amortization	(255,000)	(255,000)
Finite-Lived Intangible Assets, Net
Gross Carrying Amount	22,785,000	22,785,000
Accumulated Amortization	(18,182,000)	(17,757,000)
Finite-Lived Intangible Assets, Net	$ 4,603,000	$ 5,028,000

Note 3 - Balance Sheet Compon27

Note 3 - Balance Sheet Components - Annual Amortization of Identifiable Intangible Assets (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
2016 (remaining 6 months)	$ 380,000
2,017	728,000
2,018	701,000
2,019	701,000
2,020	701,000
2021 and thereafter	1,392,000
Total future amortization expense	$ 4,603,000	$ 5,028,000

Note 4 - Stockholders' Equity28

Note 4 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions	Jul. 01, 2016	Oct. 31, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Twenty Eleven Stock Incentive Plan [Member] | Employee Stock Option [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	16,375
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 14.14
Twenty Eleven Stock Incentive Plan [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period					10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					4 years
Twenty Eleven Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	841,533
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 14.14
Twenty Eleven Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			7,800,000		7,800,000		7,800,000
Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate					1.33
Common Stock, Capital Shares Reserved for Future Issuance			8,300,000		8,300,000		8,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			4,500,000		4,500,000		4,500,000
Shares Previously Issued Under the 2001 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			3,500,000		3,500,000		3,500,000
IDS Plan [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period					10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					4 years
Two Thousand One Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period					0.5
Outside of the 2011, 2001 or IDS Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			0		0		0
Employee Stock Purchase Plan [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					1 year 219 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options			$ 1.1		$ 1.1		$ 1.1
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate			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					675,000
ESPP Maximum Annual Share Replenishment Percentage of Prior Year Outstanding Company Common Stock					2.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans			0	0	84,000	51,000
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased					$ 9.21	$ 13.32
Number Of ESPP Shares Available For Future Issuance			2,700,000		2,700,000		2,700,000
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options			$ 0.6		$ 0.6		$ 0.6
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					3 years
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					2 years 146 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options			$ 13.6		$ 13.6		$ 13.6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					50,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 11.87
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period					7,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			1,669,000		1,669,000		1,669,000	1,764,000
Share Price			$ 13.99		$ 13.99		$ 13.99
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value					$ 0.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value					$ 0.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					50,000
Stock Repurchase Program, Authorized Amount		$ 25
Treasury Stock Shares to Be Acquired, Period		2 years
Treasury Stock, Shares, Acquired			129,457		129,457		1,219,230
Treasury Stock Acquired, Average Cost Per Share					$ 13.43
Treasury Stock, Value, Acquired, Cost Method					$ 16.4
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 8.6		$ 8.6		$ 8.6

Note 4 - Stockholders' Equity -

Note 4 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Cost of Sales [Member]
Allocation of recognized period costs	$ 956	$ 914	$ 2,041	$ 1,801
Research and Development Expense [Member]
Allocation of recognized period costs	651	510	1,357	1,001
Selling, General and Administrative Expenses [Member]
Allocation of recognized period costs	684	931	1,559	1,752
Allocation of recognized period costs	$ 2,291	$ 2,355	$ 4,957	$ 4,554

Note 4 - Stockholders' Equity30

Note 4 - Stockholders' Equity - Stock Options, Valuation Assumptions (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stock Plans [Member]
Expected life (in years)	4 years 153 days	4 years 186 days	4 years 153 days	4 years 186 days
Volatility	43.58%	46.80%	44.26%	46.70%
Risk-free interest rate	1.30%	1.41%	1.25%	1.34%
Expected dividend	0.00%	0.00%
Options granted, weighted average fair value (in dollars per share)	$ 5	$ 6.61	$ 4.46	$ 6.50
Employee Stock Purchase Plan [Member]
Expected life (in years)			1 year 91 days	1 year 91 days
Volatility			44.15%	54.21%
Risk-free interest rate			0.50%	0.26%
Expected dividend
Options granted, weighted average fair value (in dollars per share)			$ 3.56	$ 6.19
Options granted, weighted average fair value (in dollars per share)			$ 4.46

Note 4 - Stockholders' Equity31

Note 4 - Stockholders' Equity - Stock Options Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)$ / sharesshares
Outstanding, January 1, 2016 (in shares)	1,764
Outstanding, January 1, 2016 (in dollars per share) | $ / shares	$ 7.88
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	50
Exercised (in shares)	(63)
Exercised (in dollars per share) | $ / shares	$ 7.20
Canceled (in shares)	(7)
Canceled (in dollars per share) | $ / shares	$ 15.01
Expired (in shares)	(75)
Expired (in dollars per share) | $ / shares	$ 13.79
Outstanding, June 30, 2016 (in shares)	1,669
Outstanding, June 30, 2016 (in dollars per share) | $ / shares	$ 7.73
Outstanding, June 30, 2016	4 years 317 days
Outstanding, June 30, 2016 | $	$ 10,719
Vested and expected to vest, June 30, 2016 (in shares)	1,660
Vested and expected to vest, June 30, 2016 (in dollars per share) | $ / shares	$ 7.70
Vested and expected to vest, June 30, 2016	4 years 306 days
Vested and expected to vest, June 30, 2016 | $	$ 10,704
Exercisable, June 30, 2016 (in shares)	1,523
Exercisable, June 30, 2016 (in dollars per share) | $ / shares	$ 7.17
Exercisable, June 30, 2016	4 years 178 days
Exercisable, June 30, 2016 | $	$ 10,539

Note 4 - Stockholders' Equity32

Note 4 - Stockholders' Equity - Stock Options Activity (Details) (Parentheticals)	6 Months Ended
	Jun. 30, 2016$ / shares
Options granted, weighted average fair value (in dollars per share)	$ 4.46

Note 4 - Stockholders' Equity33

Note 4 - Stockholders' Equity - Nonvested Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	6 Months Ended
	Jun. 30, 2016$ / sharesshares
Nonvested, January 1, 2016 (in shares) | shares	1,166
Nonvested, January 1, 2016 (in dollars per share) | $ / shares	$ 17.03
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares	50
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares	$ 11.87
Vested (in shares) | shares	(258)
Vested (in dollars per share) | $ / shares	$ 16.70
Forfeited (in shares) | shares	(42)
Forfeited (in dollars per share) | $ / shares	$ 17.27
Nonvested, June 30, 2016 (in shares) | shares	916
Nonvested, June 30, 2016 (in dollars per share) | $ / shares	$ 16.83

Note 5 - Income Taxes (Details

Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
California R&D Tax Credits and California Net Operating Losses Related Acquisition of Syntricity [Member]
Deferred Tax Assets, Valuation Allowance	$ 6,400		$ 6,400		$ 6,200
Earliest Tax Year [Member] | State and Local Jurisdiction [Member]
Open Tax Year			2,012
Latest Tax Year [Member] | State and Local Jurisdiction [Member]
Open Tax Year			2,014
Increase (Decrease) in Income Taxes			$ (2,600)
Income Tax Expense (Benefit)	1,498	$ 1,572	$ 2,523	$ 5,125
Effective Income Tax Rate Reconciliation, Percent			37.10%	38.70%
Unrecognized Tax Benefits	11,300		$ 11,300		11,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6,700		6,700		$ 6,500
Unrecognized Tax Benefits In Long Term Liabilities	2,600		2,600
Unrecognized Tax Benefits In Deferred Tax Assets	9,200		9,200
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	$ 4,600		$ 4,600

Note 6 - Net Income Per Share -

Note 6 - Net Income Per Share - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net Income (Loss) Attributable to Parent	$ 2,214	$ 2,149	$ 4,276	$ 8,116
Basic weighted average common shares outstanding (in shares)	31,276	31,522	31,222	31,429
Dilutive effect of equity incentive plans (in shares)	747	878	650	916
Diluted weighted average common shares outstanding (in shares)	32,023	32,400	31,872	32,345
Basic (in dollars per share)	$ 0.07	$ 0.07	$ 0.14	$ 0.26
Earnings Per Share, Diluted	$ 0.07	$ 0.07	$ 0.13	$ 0.25

Note 6 - Net Income Per Share36

Note 6 - Net Income Per Share - Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Employee Stock Option [Member]
Antidilutive securities (in shares)	230	58	264	52
Restricted Stock Units RSU Nonvested [Member]
Antidilutive securities (in shares)	348	62	798	64
Employee Stock Purchase Plan [Member]
Antidilutive securities (in shares)		215	230	239
Antidilutive securities (in shares)	578	335	1,292	355

Note 7 - Customer and Geograp37

Note 7 - Customer and Geographic Information (Details Textual)	6 Months Ended
	Jun. 30, 2016
Number of Operating Segments	1

Note 7 - Customer and Geograp38

Note 7 - Customer and Geographic Information - Revenue Percentage by Major Customers (Details) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member]	3 Months Ended				6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015
Customer A [Member]
Receivables percentage by major customer	39.00%		54.00%		44.00%		49.00%
Customer B [Member]
Receivables percentage by major customer		[1]	16.00%			[1]	13.00%
Customer C [Member]
Receivables percentage by major customer		[1]		[1]	12.00%		17.00%
Customer D [Member]
Receivables percentage by major customer	13.00%			[1]		[1]		[1]
[1]	represents less than 10%

Note 7 - Customer and Geograp39

Note 7 - Customer and Geographic Information - Receivables Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Accounts Receivable [Member]	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Customer A [Member]
Receivables percentage by major customer	50.00%	65.00%
Customer D [Member]
Receivables percentage by major customer	12.00%		[1]
[1]	represents less than 10%

Note 7 - Customer and Geograp40

Note 7 - Customer and Geographic Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES
Revenues	$ 9,518	$ 11,436	$ 21,640	$ 21,750
Receivables percentage by major customer	36.00%	49.00%	42.00%	43.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | TAIWAN, PROVINCE OF CHINA
Revenues	$ 5,725	$ 2,160	$ 7,909	$ 3,279
Receivables percentage by major customer	21.00%	9.00%	15.00%	7.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | GERMANY
Revenues	$ 3,994	$ 6,345	$ 7,028	$ 12,609
Receivables percentage by major customer	15.00%	27.00%	14.00%	25.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | KOREA, REPUBLIC OF
Revenues	$ 2,184	$ 627	$ 5,497	$ 7,545
Receivables percentage by major customer	8.00%	3.00%	11.00%	15.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Rest of the World [Member]
Revenues	$ 5,267	$ 2,642	$ 9,695	$ 4,844
Receivables percentage by major customer	20.00%	12.00%	18.00%	10.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenues	$ 26,688	$ 23,210	$ 51,769	$ 50,027
Receivables percentage by major customer	100.00%	100.00%	100.00%	100.00%
Revenues	$ 26,688	$ 23,210	$ 51,769	$ 50,027

Note 7 - Customer and Geograp41

Note 7 - Customer and Geographic Information - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
UNITED STATES
Long-lived assets	$ 15,559	$ 10,752
Rest of the World [Member]
Long-lived assets	517	573
Long-lived assets	$ 16,076	$ 11,325

Note 8 - Fair Value Measureme42

Note 8 - Fair Value Measurements (Details Textual) - Foreign Exchange Contract [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Other Nonoperating Income (Expense) [Member]
Derivative, Gain (Loss) on Derivative, Net	$ (300,000)	$ 100,000	$ 8,000	$ (600,000)
Other Current Liabilities [Member]
Derivative Liability, Current	28,000		28,000		$ 62,000
Derivative Asset, Notional Amount	$ 7,100,000		$ 7,100,000		$ 6,700,000

Note 8 - Fair Value, Assets Mea

Note 8 - Fair Value, Assets Measured on a Recurring Basis (Details) - Money Market Mutual Funds [Member] - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member]
Money market mutual funds	$ 26,415	$ 26,371
Fair Value, Inputs, Level 2 [Member]
Money market mutual funds
Fair Value, Inputs, Level 3 [Member]
Money market mutual funds
Money market mutual funds	$ 26,415	$ 26,371

Note 9 - Commitments and Cont44

Note 9 - Commitments and Contingencies (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Loss Contingency Accrual	$ 0		$ 0
Operating Leases, Rent Expense, Net	$ 600,000	$ 500,000	$ 1,200,000	$ 1,000,000

Note 9 - Commitments and Cont45

Note 9 - Commitments and Contingencies - Future Minimum Lease Payments Under Noncancelable Operating Leases (Details) $ in Thousands	Jun. 30, 2016USD ($)
2016 (remaining six months)	$ 1,028
2,017	1,733
2,018	1,087
2,019	264
2,020	195
2021 and thereafter	61
Total future minimum lease payments	$ 4,368