PDF Solutions (PDFS) 10-K 16 Mar 18 2017 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Mar. 12, 2018	Jun. 30, 2017
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)		32,295,144
Entity Public Float			$ 450
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 101,267	$ 116,787
Accounts receivable, net of allowances of $374 and $200, respectively	57,564	48,157
Prepaid expenses and other current assets	5,069	5,335
Total current assets	163,900	170,279
Property and equipment, net	25,386	19,341
Goodwill	1,923	215
Intangible assets, net	6,074	4,223
Deferred tax assets	16,348	15,640
Other non-current assets	10,545	12,631
Total assets	224,176	222,329
Current liabilities:
Accounts payable	2,536	2,206
Accrued compensation and related benefits	6,493	5,959
Accrued and other current liabilities	2,627	2,080
Deferred revenues - current portion	7,981	8,189
Billings in excess of recognized revenues		88
Total current liabilities	19,637	18,522
Long-term income taxes payable	3,902	3,354
Other non-current liabilities	2,269	1,650
Total liabilities	25,808	23,526
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 39,799 and 38,514, respectively; shares outstanding 32,112 and 31,864, respectively	5	5
Additional paid-in capital	297,950	281,423
Treasury stock, at cost, 7,688 and 6,650 shares, respectively	(71,793)	(54,882)
Accumulated deficit	(27,089)	(25,752)
Accumulated other comprehensive loss	(705)	(1,991)
Total stockholders’ equity	198,368	198,803
Total liabilities and stockholders’ equity	$ 224,176	$ 222,329

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts receivable, allowance	$ 374	$ 200
Preferred stock, par value (in dollars per share)	$ 0.00015	$ 0.00015
Preferred stock, shares authorized (in shares)	5,000	5,000
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	70,000
Common stock, shares issued (in shares)	39,799	38,514
Common stock, shares outstanding (in shares)	32,112	31,864
Treasury stock, shares (in shares)	7,688	6,650

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Design-to-silicon-yield solutions	$ 74,436	$ 77,162	$ 63,839
Gainshare performance incentives	27,435	30,299	34,138
Total revenues	101,871	107,461	97,977
Cost of Design-to-silicon-yield solutions:
Direct costs of Design-to-silicon-yield solutions	47,050	44,074	38,847
Impairment of deferred cost
Amortization of acquired technology	471	374	176
Total cost of Design-to-silicon-yield solutions	47,521	44,448	39,023
Gross profit	54,350	63,013	58,954
Operating expenses:
Research and development	30,078	27,559	19,096
Selling, general and administrative	23,684	22,056	20,421
Amortization of other acquired intangible assets	398	432	196
Restructuring charges
Total operating expenses	54,160	50,047	39,713
Income from operations	190	12,966	19,241
Interest and other (expense) income, net	(264)	(10)	181
Income before taxes	(74)	12,956	19,422
Income tax provision (benefit)	1,263	3,853	7,015
Net income (loss)	$ (1,337)	$ 9,103	$ 12,407
Net income (loss) per share
Basic (in dollars per share)	$ (0.04)	$ 0.29	$ 0.39
Diluted (in dollars per share)	$ (0.04)	$ 0.28	$ 0.39
Weighted average common shares
Basic (in shares)	32,038	31,373	31,424
Diluted (in shares)	32,038	32,431	32,164
Net income (loss)	$ (1,337)	$ 9,103	$ 12,407
Other comprehensive (loss) income:
Foreign currency translation adjustments, net of tax	1,286	(448)	(862)
Comprehensive income (loss)	$ (51)	$ 8,655	$ 11,545

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 31, 2014	31,116		5,142
Balances at Dec. 31, 2014	$ 5	$ 248,734	$ (34,048)	$ (52,187)	$ (681)	$ 161,823
Issuance of common stock in connection with employee stock purchase plan (in shares)	110
Issuance of common stock in connection with employee stock purchase plan		1,379				$ 1,379
Issuance of common stock in connection with exercise of options (in shares)	655					655,000
Issuance of common stock in connection with exercise of options		5,039				$ 5,039
Vesting of restricted stock units (in shares)	453
Vesting of restricted stock units
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)	(133)		133
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (1,810)			(1,810)
Repurchases of common stock (in shares)	(1,090)		1,090
Repurchases of common stock			$ (14,525)			(14,525)
Stock-based compensation expense		9,761				9,761
Tax benefit from employee stock plans		1,095				1,095
Comprehensive income				12,407	(862)	11,545
Balances (in shares) at Dec. 31, 2015	31,111		6,365
Balances at Dec. 31, 2015	$ 5	266,008	$ (50,383)	(39,780)	(1,543)	174,307
Issuance of common stock in connection with employee stock purchase plan (in shares)	173
Issuance of common stock in connection with employee stock purchase plan		1,557				$ 1,557
Issuance of common stock in connection with exercise of options (in shares)	393					393,000
Issuance of common stock in connection with exercise of options		2,972				$ 2,972
Vesting of restricted stock units (in shares)	336
Vesting of restricted stock units
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			136
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (2,317)			(2,317)
Repurchases of common stock (in shares)	(149)		149
Repurchases of common stock			$ (2,182)			(2,182)
Stock-based compensation expense		10,886				10,886
Tax benefit from employee stock plans
Comprehensive income				9,103	(448)	8,655
Cumulative-effect adjustment from adoption of ASU 2016-09 | Accounting Standards Update 2016-09 [Member]				4,925		4,925
Balances (in shares) at Dec. 31, 2016	31,864		6,650
Balances at Dec. 31, 2016	$ 5	281,423	$ (54,882)	(25,752)	(1,991)	198,803
Issuance of common stock in connection with employee stock purchase plan (in shares)	200
Issuance of common stock in connection with employee stock purchase plan		1,864				$ 1,864
Issuance of common stock in connection with exercise of options (in shares)	440					440,000
Issuance of common stock in connection with exercise of options		2,823				$ 2,823
Vesting of restricted stock units (in shares)	450
Vesting of restricted stock units
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			196
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (3,493)			$ (3,493)
Repurchases of common stock (in shares)	(842)		842			842,182
Repurchases of common stock			$ (13,418)			$ (13,418)
Stock-based compensation expense		11,840				11,840
Tax benefit from employee stock plans
Comprehensive income				(1,337)	1,286	(51)
Balances (in shares) at Dec. 31, 2017	32,112		7,688
Balances at Dec. 31, 2017	$ 5	$ 297,950	$ (71,793)	$ (27,089)	$ (705)	$ 198,368

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities:
Net income (loss)	$ (1,337)	$ 9,103	$ 12,407
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,789	3,584	2,646
Stock-based compensation expense	11,810	11,002	9,756
Accrued contingent earn-out payments			500
Amortization of acquired intangible assets	869	805	372
Deferred taxes	(504)	216	1,563
Provision for (reversal of) doubtful accounts	174	(99)	(82)
Unrealized (gain) loss on foreign currency forward contract	(27)	(47)	12
Loss on disposal of assets	6	107	2
Tax benefit related to stock-based compensation expense			1,095
Excess tax benefit from stock-based compensation expense			(1,034)
Changes in operating assets and liabilities, net of acquisition effects:
Accounts receivable, net of allowances	(9,581)	(14,620)	4,373
Prepaid expenses and other current assets	373	(1,688)	(583)
Accounts payable	1,963	85	(684)
Accrued compensation and related benefits	249	1,178	(1,353)
Accrued and other liabilities	72	(231)	166
Deferred revenues	(326)	4,772	411
Billings in excess of recognized revenues	(88)	(1,179)	1,267
Other non-current assets	2,103	(10,988)	(498)
Net cash provided by operating activities	10,545	2,000	30,336
Investing activities:
Purchases of property and equipment	(10,255)	(11,282)	(4,784)
Purchases of intangible asset			(400)
Payments for business acquisitions, net of cash acquired	(3,841)		(5,152)
Net cash used in investing activities	(14,096)	(11,282)	(10,336)
Financing activities:
Payments of obligations assumed in business acquisition			(347)
Proceeds from exercise of stock options	2,822	2,972	5,039
Proceeds from employee stock purchase plan	1,865	1,557	1,379
Repurchases of common stock	(13,418)	(2,182)	(14,525)
Excess tax benefit from stock-based compensation expense			1,034
Payments for taxes related to net share settlement of equity awards	(3,493)	(2,317)	(1,810)
Net cash (used in) provided by financing activities	(12,224)	30	(9,230)
Effect of exchange rate changes on cash and cash equivalents	255	(119)	(76)
Net (decrease) increase in cash and cash equivalents	(15,520)	(9,371)	10,694
Cash and cash equivalents, beginning of year	116,787	126,158	115,464
Cash and cash equivalents, end of year	101,267	116,787	126,158
Supplemental disclosure of cash flow information:
Taxes	2,244	3,635	4,983
Interest			16
Property and equipment received and accrued in accounts payable and accrued and other liabilities	$ 1,235	$ 666	$ 212

Note 1 - Business and Significa

Note 1 - Business and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [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, 2017, three 57% one 40% 2017. December 31, 2016, two 55% two 52% 2016. 9 not Cash, Cash Equivalents and Short-term Investments — The Company considers all highly liquid investments with an original maturity of 90 three one 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 intangible assets. The Company periodically reviews its long-lived assets for impairment . may not not Goodwill — The Company records goodwill when the purchase consideration of an acquisition exceeds the fair value of the net tangible and identified intangible assets as of the date of acquisition. The Company performs an annual impairment assessment of its goodwill during the fourth not not not no two first second one no Revenue Recognition — The Company derives revenue from two Design-to-silicon-yield solutions — Revenues that are derived from Design-to-silicon-yield solutions come from services and software and hardware 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 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 year ended December 31, 2017, two $1.2 $0.04 December 31, 2016, one ’s profitability from revisions in estimates due to the scope changes that resulted in favorable changes of net income of $0.9 $0.03 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, if applicable, 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 not third not In some instances, the Company also licenses its D esign-For-Inspection (“DFI”) system as a separate component of fixed-price service contracts. The Company allocates revenue to all deliverables based on their relative selling prices. The Company currently does not 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. The Company also defers costs from arrangements that required us to defer the revenues, typically due to revenue recognition from multi-element arrangements or from contracts subject to customer acceptance. These costs are recognized in proportion to the related revenue. 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 no was $0.6 $0.5 December 31, 2017 December 31, 2016, The Company also licenses its software products separately from solution implementations. For software license arrangements that do not 2 3 4 5 not 1 2 3 Revenue from software-as-a-service (SaaS) that allow for the use of a hosted software product or service over a contractually determined period of time without taking possession of software are accounted for as subscriptions and recognized as revenue ratably over the coverage period beginning on the date the service is made available to customers. Revenue for software licenses with extended payment terms is not Deferred revenues consist substantially of amounts invoiced in advance of revenue recognition and is recognized as the revenue recognition criteria are met. Deferred revenues that will be recognized during the succeeding 12 $1.5 $1.5 December 31, 2017 2016. Gainshare Performance Incentives — When the Company enters into a contract to provide yield improvement services, the contract usually includes two 1 2 may no Accounts Receivable — Accounts receivable include amounts that are unbilled at the end of the period that are expected to be billed and collected within 12 $22.2 $20.8 December 31, 2017, December 31, 2016, not 12 $8.6 $9.8 December 31, 2017 2016, Allowance for doubtful accounts are summarized below: Balance at Beginning of Period Charged to Costs and Expenses Deductions/ Write-offs of Accounts Balance at End of Period Allowance for doubtful accounts 201 7 $ 200 $ 174 $ — $ 374 201 6 $ 299 $ — $ 99 $ 200 201 5 $ 381 $ — $ 82 $ 299 Software Development Costs — Internally developed software includes software developed to meet our internal needs to provide solution implementation services to our end-customers. These capitalized costs consist of internal compensation related costs and external direct costs incurred during the application development stage and are amortized over their useful lives, generally six not 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 Income Taxes not not No not not 50% Net Income Per Share – No 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 statements of operations and comprehensive income. 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 not not two three 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, 2017, not no no Recent Accounting Pronouncements — In May 2014, No. 2014 09, 606 605 . Under Topic 606, five December 15, 2017, . In addition, the standard requires enhanced disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The guidance permits two . Topic 606 first 2018. . The use of the modified retrospective transition method requires us to evaluate only contracts that were in effect at the beginning of fiscal 2018 those contracts had been accounted for under Topic 606 not In preparation for adoption of the standard, we are implementing changes to policies, processes and controls related to revenue recognition . We do not While the Company ’s adoption and evaluation of the impact of this new guidance is not Generally , we expect revenue generated under Topic 606 605, 606, 2018 The adoption of Topic 606 software multi-element arrangements (“MEA”) that combine software-related deliverables, which may 605 606 More judgments and estimates are required under Topic 606 605, arrangements with multiple elements and estimating the amount of variable consideration within our Integrated Yield Ramp (or IYR) engagements that include a Gainshare element. Due to the complexity of certain of our commercial contracts that include contingent variable fees, the actual revenue recognition treatment required under Topic 606 may 605. may Topic 606 our commission rates paid for renewals are commensurate with the rates paid for initial contracts, we will recognize the deferred direct costs over the contract term. The modified retrospective transition approach allows us to avoid restating comparative years, however in 2018, 606 605 . In February 2016, No. 2016 02, 842 ’ financial statements issued for fiscal years beginning after December 15, 2018, In August 2016, No. 2016 15, December 15, 2017, not In November 2016, No. 2016 18, December 31, 2018, In January 2017, No. 2017 01, December 15, 2017. The Company does not In January 2017, No. 2017 04, 350 No. 2017 04” No. 2017 04 2 December 15, 2019, not In May 2017, No. 2017 09, 718 No. 2017 09” No. 2017 09 718. December 15, 2017. In February 2018, No. 2018 02, 220 December 2017. December 15, 2018 The Company does not

Note 2 - Property and Equipment

Note 2 - Property and Equipment	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	2. Property and Equipment Property and equipment consist of (in thousands): December 31, 201 7 201 6 Computer equipment $ 10,729 $ 10,642 Software 3,348 1,679 Furniture, fixtures, and equipment 3,676 1,185 Leasehold improvements 1,980 1,132 Test equipment 13,796 11,723 Construction-in-progress 12,527 9,550 46,056 35,911 Accumulated depreciation (20,670 ) (16,570 ) Total $ 25,386 $ 19,341 Test equipment includes DFI assets at customer sites that are contributing to DFI solution revenues. The construction-in-progress balance related to construction of DFI assets totaled $10.9 $8.0 December 31, 2017 December 31, 2016, December 31, 2017, 2016, 2015 $4.8 $3.6 $2.6

Note 3 - Business Combination

Note 3 - Business Combination	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Business Combination Disclosure [Text Block]	3. Business Combination On July 11, 2017 ( acquired certain assets from Realtime Performance Europe B.V. (formerly doing business as Kinesys Software). Pursuant to the terms of an asset purchase agreement, the Company acquired the ALPS and GEMbox software products and certain related liabilities for the purpose of adding device traceability and process data collection through assembly and test to the software products it licenses. The total purchase price was $4.3 $0.5 may July 11, 2019, $0.6 , which are remeasured at each reporting date until settlement. These inputs include the probability of meeting the milestones related to the integration and license of the ALPS software and a risk-adjusted discount rate to adjust the probability-weighted cash flows to present value. The Company accounted for this acquisition as a business combination. This method requires that assets acquired and liabilities assumed in a business combination be recognized at their fair values as of the Acquisition Date. The excess of purchase consideration over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill. The goodwill recorded from this acquisition represents business benefits the Company anticipates realizing from optimizing resources and new and expanded sales opportunities that extend the Company's footprint throughout the entire systems value chain. The amount of goodwill expected to be deductible for tax purposes is $1.7 not not Intangible assets consist of developed technology, customer relationships, and trademarks. The value assigned to intangibles are based on estimates and judgments regarding expectations for success and life cycle of intangibles acquired. The following table summarizes the allocation of the fair values of the assets acquired and liabilities assumed and the related useful lives, where applicable: (in thousand) Amortization period (years) Finite-lived intangible assets : Developed technology $ 1,720 9 Customer relationship 820 9 Tradename 180 7 Deferred revenue (190 ) Other receivables 53 Net asset acquired $ 2,583 Goodwill 1,708 Purchase consideration $ 4,291

Note 4 - Goodwill and Intangibl

Note 4 - Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	4 . Goodwill and Intangible Assets As of both December 31, 2017, December 31, 2016, $1.9 December 31, 201 7 Balance as of December 31, 201 6 $ 215 Add: Goodwill from acquisition 1,708 Goodwill adjustment - Balance as of December 31, 201 7 $ 1,923 Intangible assets balance was $6.1 $4.2 December 31, 2017, December 31, 2016, December 31, 2016, December 31, 201 7 Decemb er 31, 201 6 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 $ 6,740 $ (4,145 ) $ 2,595 $ 5,920 $ (3,825 ) $ 2,095 Developed technology 4 - 6 15,820 (12,829 ) 2,991 14,100 (12,359 ) 1,741 Tradename 2 - 4 790 (622 ) 168 610 (583 ) 27 Backlog 1 100 (100 ) - 100 (100 ) - Patent 7 - 10 1,800 (1,480 ) 320 1,800 (1,440 ) 360 Other acquired intangibles 4 255 (255 ) - 255 (255 ) - Total $ 25,505 $ (19,431 ) $ 6,074 $ 22,785 $ (18,562 ) $ 4,223 The weighted average amortization period for acquired identifiable intangible assets was 6.74 December 31, 2017. December 31, 2017, 2016, 2015 $0.9 $0.8 $0.4 Year Ending December 31, 201 8 $ 1,009 201 9 1,009 20 20 1,009 202 1 833 202 2 626 202 3 and thereafter 1,588 Total future amortization expense $ 6,074 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 December 31, 201 7, no

Note 5 - Commitments and Contin

Note 5 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
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 2024. $2.3 $2.2 $2.1 2017, 2016, 2015, Future minimum lease payments under noncancelable operating leases at December 31, 201 7, Year Ending December 31, 201 8 $ 1,767 201 9 535 20 20 445 202 1 361 202 2 101 202 3 and thereafter 26 Total future minimum lease payments $ 3,235 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 third not 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, 2017, $9.5 12 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 may ’ 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 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, 2017, not no no

Note 6 - Stockholders' Equity

Note 6 - Stockholders' Equity	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
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, 201 7 201 6 201 5 Cost of Design-to-silicon-yield solutions $ 4,606 $ 4,427 $ 3,914 Research and development 3,518 3,087 2,275 Selling, general and administrative 3,686 3,488 3,567 Stock-based compensation expense $ 11,810 $ 11,002 $ 9,756 The stock-based compensation expense for the year s ended December 31, 2017, 2016, 2015 $30,000, $116,000, 5,000 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 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 201 7 201 6 201 5 201 7 201 6 201 5 Expected life (in years) 4.42 4.4 4.5 1.25 1.25 1.25 Volatility 41.5 % 43.2 % 45.8 % 40.63 % 44.0 % 50.1 % Risk-free interest rate 1.81 % 1.34 % 1.37 % 1.25 % 0.50 % 0.34 % Expected dividend — — — — — — On December 31, 201 7, Stock Plans — At the annual meeting of stockholders on November 16, 2011, 2011 “2011 2011 may 9,050,000 3,500,000 2001 2001 November 16, 2011. 1.33 no ten four In 2001, 2001 “2001 2003, ’ 2001 2001 2011. 2001 ten four no may 2001 2001 As of December 31, 201 7, 9.6 2011 3.9 2011 0.5 2001 2011 December 31, 2017. December 31, 2017, no 2011, 2001 Additional information with respect to options under the Plans is as follows: Outstanding Options 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, 201 5 2,352 7.65 Granted (weighted average fair value of $ 5.45 per share) 93 13.88 Exercised (655 ) 7.70 Canceled (23 ) 12.95 Expired (3 ) 12.91 Outstanding, December 31, 201 5 1,764 7.88 Granted (weighted average fair value of $5. 36 per share) 99 14.55 Exercised (393 ) 7.56 Canceled (31 ) 13.82 Expired (75 ) 13.80 Outstanding, December 31, 201 6 1,364 8.00 Granted (weighted average fair value of $5. 92 per share) 150 16.28 Exercised (440 ) 6.42 Canceled (25 ) 15.03 Expired (4 ) 16.46 Outstanding, December 31, 201 7 1,045 9.65 4.98 $ 6,654 Vested and expected to vest, December 31, 201 7 1,025 9.52 4.89 $ 6,641 Exercisable, December 31, 201 7 830 8.06 3.91 $ 6,472 The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company ’s closing stock price of $15.70 December 31, 2017, December 31, 2017, 2016, 2015 $5.3 $4.4 $6.2 As of December 31, 201 7, $1.0 3.27 December 31, 2017, $0.3 Nonvested shares (restricted stock units) were as follows: Shares (in thousands) Weighted- Average Grant-Date Fair Value Nonvested, January 1, 201 5 941 17.38 Granted 720 15.92 Vested (453 ) 15.97 Forfeited (42 ) 17.27 Nonvested, December 31, 201 5 1,166 17.03 Granted 963 14.41 Vested (472 ) 17.00 Forfeited (115 ) 15.73 Nonvested, December 31, 201 6 1,542 15.50 Granted 849 16.43 Vested (646 ) 16.26 Forfeited (128 ) 15.71 Nonvested, December 31, 201 7 1,617 15.66 As of December 31, 201 7, $21.0 2.6 not Employee Stock Purchase Plan — In July 2001, ten 10% 85% twenty-four four six January 1 2002, 1 675,000 2 2% 3 May 18, 2010, May 17, 2020. December 31, 2017, 8.1 2017, 2016, 2015, 200,000, 173,000, 110,000, $9.33, $9.00, $12.57 December 31, 2017, 4.3 2017, 2016, 2015 $5.22, $3.69, $5.51 December 31, 2017, $0.3 1.34 Stock Repurchase Program — On October 25, 2016, program, effective immediately, to repurchase up to $25.0 two December 31, 2017, 842,182 December 31, 2017, 842,182 $15.93 $13.4 $11.6

Note 7 - Income Taxes

Note 7 - Income Taxes	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Income Tax Disclosure [Text Block]	7 . Income Taxes On December 22, 2017, 2017 not 35% 21%, $3.2 The Act also imposed a one ’s post- 1986 no second 2018. The Company has not December 31, 2017. In December 2017, No. 118, 118 not one Act enactment date. Since the 2017 fourth 2017, 12 118. Year Ended December 31, 201 7 201 6 201 5 (In thousands) U.S. Current $ (141 ) $ 410 $ 2,022 Deferred (471 ) 208 1,549 Foreign Current 254 329 341 Withholding 1,654 2,898 3,089 Deferred (33 ) 8 14 Total provision $ 1,263 $ 3,853 $ 7,015 During the years ended December 31, 201 7, 2016 2015, 1.2 $11.3 $17.7 $1.1 $1.6 $1.7 The income tax provision differs from the amount estimated by applying the statutory federal income tax rate ( 35% Year Ended December 31, 201 7 201 6 201 5 Federal statutory tax provision $ (26 ) $ 4,534 $ 6,798 State tax provision (110 ) 283 465 Stock compensation expense (944 ) 45 677 Tax credits (2,769 ) (4,000 ) (4,166 ) Foreign tax, net 1,641 2,852 3,111 Tax Law Changes 3,247 — — Other 224 139 130 Tax provision $ 1,263 $ 3,853 $ 7,015 As of December 31, 201 7, $3.2 $5.6 2019 2028, As of December 31, 201 7, $13 $16.5 2027, no may three 1986 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, December 31, 201 7 2016, not” not not” December 31, 2017 2016, $9.0 $6.7 $0.1 not not December 31, 2017 2016 $15.5 $15.0 The components of the net deferred tax assets are comprised of (in thousands): December 31, 201 7 201 6 Deferred tax assets Net operating loss carry forward $ 1,318 $ 1,768 Research and development and other credit carry forward 16,626 12,345 Foreign tax credit carry forward 1,754 — Accruals deductible in different periods 3,285 3,446 Intangible assets 1,325 2,573 Stock-based compensation 1,166 2,285 Valuation allowance (9,126 ) (6,798 ) Subtotal $ 16,348 $ 15,619 Deferred tax liabilities Fixed assets (835 ) (619 ) Net Deferred tax assets $ 15,513 $ 15,000 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, 2017 2016, $0.7 $0.6 December 31, 2017, 2016, 2015, $135,000, $72,000, $28,000, The Company ’s total amount of unrecognized tax benefits, excluding interest and penalties, as of December 31, 2017 $12.9 $7.7 December 31, 2017, $3.1 $9.8 $5.2 not twelve 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 not A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): Amount Gross unrecognized tax benefits, January 1, 201 5 $ 10,428 Increases in tax positions for current year 720 Increase in tax positions for prior years 162 Lapse in statute of limitations (331 ) Gross unrecognized tax benefits, December 31, 201 5 10,979 Increases in tax positions for current year 1,118 Increases in tax positions for prior years 112 Lapse in statute of limitations (269 ) Gross unrecognized tax benefits, December 31, 201 6 11,940 Increases in tax positions for current year 1,166 Increases in tax positions for prior years - Lapse in statute of limitations (216 ) Gross unrecognized tax benefits, December 31, 2017 $ 12,889 We do not Valuation allowance for deferred tax assets is summarized: Balance at Beginning of Period Charged to Costs and Expenses Balance assumed in acquisition Deductions/ Write-offs of Accounts Balance at End of Period Valuation allowance for deferred tax assets 201 7 $ 6,798 $ 2,328 $ 0 $ — $ 9,126 201 6 6,205 $ 593 $ 0 $ — $ 6,798 201 5 5,433 $ 557 $ 215 $ — $ 6,205

Note 8 - Net Income (Loss) Per

Note 8 - Net Income (Loss) Per Share	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Earnings Per Share [Text Block]	8 . Net Income (loss) 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. The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income (loss) per share (in thousands except per share amount): Year Ended December 31, 201 7 201 6 201 5 Numerator: Net income (loss) $ (1,337 ) $ 9,103 $ 12,407 Denominator: Basic weighted-average shares outstanding 32,038 31,373 31,424 Effect of dilutive options and restricted stock — 1,058 740 Diluted weighted-average shares outstanding 32,038 32,431 32,164 Net income (loss) per share – Basic $ (0.04 ) $ 0.29 $ 0.39 Net income (loss) per share – Diluted $ (0.04 ) $ 0.28 $ 0.39 For the year ended December 31, 2017, no The following table sets forth potential shares of common stock that are not December 31, 201 7 201 6 Outstanding options — 134 Nonvested shares of restricted stock units — 18 Employee Stock Purchase Plan — 121 Total — 273

Note 9 - Customer and Geographi

Note 9 - Customer and Geographic Information	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	9 . 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, allocation of resources, and assessing financial performance. Accordingly the Company considers itself to be in one The Company had revenues from individual customers in excess of 10% Year Ended December 31, Customer 201 7 201 6 201 5 A 40 % 41 % 53 % B * 11 % 12 % * represents less than 10% The Company had accounts receivable balances (including amounts that are unbilled) from individual customers in excess of 10% December 31, Customer 201 7 201 6 A 41 % 42 % C 15 % 13 % * 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, 201 7 201 6 201 5 Revenues Percentage of Revenues Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 39,631 39 % $ 38,748 36 % $ 45,082 46 % China 17,872 18 11,436 11 1,125 1 Taiwan 12,494 12 15,216 14 7,862 8 Germany 9,990 10 17,253 16 23,198 24 Rest of the world 21,884 21 24,808 23 20,710 21 Total revenue $ 101,871 100 % $ 107,461 100 % $ 97,977 100 % Long-lived assets, net by geographic area is as follows (in thousands): December 31, 201 7 201 6 United States $ 24,883 $ 18,818 Rest of the world 503 523 Total long-lived assets, net $ 25,386 $ 19,341

Note 10 - Financial Instruments

Note 10 - Financial Instruments	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Fair Value Disclosures [Text Block]	10 . 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 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 Level 3 Inputs are derived from valuation techniques in which one The following table represents the Company ’s assets measured at fair value on a recurring basis as of December 31, 2017, 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 $ 26,638 $ 26,638 $ — $ — The following table represents the Company ’s assets measured at fair value on a recurring basis as of December 31, 2016 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 $ 26,456 $ 26,456 $ — $ — 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 ’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 not December 31, 2017, 2016, 2015 $0.7 $0.4 $0.8 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 not December 31, 2017, one $8.2 $12,000

Note 11 - Employee Benefit Plan

Note 11 - Employee Benefit Plan	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Compensation and Employee Benefit Plans [Text Block]	1 1 . Employee Benefit Plan During 1999, 401 may 15% no

Note 12 - Selected Quarterly Fi

Note 12 - Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Quarterly Financial Information [Text Block]	1 2 . 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, 2017 2016. Year Ended December 31, 201 7 Q1 Q2 Q3 Q4 (In thousands, except for per share amounts) Total revenues $ 24,289 $ 24,289 $ 26,517 $ 26,776 Gross profit $ 12,858 $ 12,910 $ 14,086 $ 14,495 Net income $ 517 $ 189 $ 590 $ (2,634 ) Net income per share: Basic $ 0.02 $ 0.01 $ 0.02 $ (0.08 ) Diluted $ 0.02 $ 0.01 $ 0.02 $ (0.08 ) Year Ended December 31, 201 6 Q1 Q2 Q3 Q4 (In thousands, except for per share amounts) Total revenues $ 25,081 $ 26,688 $ 27,259 $ 28,433 Gross profit $ 14,875 $ 16,034 $ 15,807 $ 16,297 Net income $ 2,061 $ 2,133 $ 1,984 $ 2,925 Net income per share: Basic $ 0.07 $ 0.07 $ 0.06 $ 0.09 Diluted $ 0.07 $ 0.07 $ 0.06 $ 0.09

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
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, 2017, three 57% one 40% 2017. December 31, 2016, two 55% two 52% 2016. 9 not
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 three one
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 intangible assets. The Company periodically reviews its long-lived assets for impairment . may not not
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill — The Company records goodwill when the purchase consideration of an acquisition exceeds the fair value of the net tangible and identified intangible assets as of the date of acquisition. The Company performs an annual impairment assessment of its goodwill during the fourth not not not no two first second one no
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition — The Company derives revenue from two Design-to-silicon-yield solutions — Revenues that are derived from Design-to-silicon-yield solutions come from services and software and hardware 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 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 year ended December 31, 2017, two $1.2 $0.04 December 31, 2016, one ’s profitability from revisions in estimates due to the scope changes that resulted in favorable changes of net income of $0.9 $0.03 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, if applicable, 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 not third not In some instances, the Company also licenses its D esign-For-Inspection (“DFI”) system as a separate component of fixed-price service contracts. The Company allocates revenue to all deliverables based on their relative selling prices. The Company currently does not 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. The Company also defers costs from arrangements that required us to defer the revenues, typically due to revenue recognition from multi-element arrangements or from contracts subject to customer acceptance. These costs are recognized in proportion to the related revenue. 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 no was $0.6 $0.5 December 31, 2017 December 31, 2016, The Company also licenses its software products separately from solution implementations. For software license arrangements that do not 2 3 4 5 not 1 2 3 Revenue from software-as-a-service (SaaS) that allow for the use of a hosted software product or service over a contractually determined period of time without taking possession of software are accounted for as subscriptions and recognized as revenue ratably over the coverage period beginning on the date the service is made available to customers. Revenue for software licenses with extended payment terms is not Deferred revenues consist substantially of amounts invoiced in advance of revenue recognition and is recognized as the revenue recognition criteria are met. Deferred revenues that will be recognized during the succeeding 12 $1.5 $1.5 December 31, 2017 2016. Gainshare Performance Incentives — When the Company enters into a contract to provide yield improvement services, the contract usually includes two 1 2 may no
Receivables, Policy [Policy Text Block]	Accounts Receivable — Accounts receivable include amounts that are unbilled at the end of the period that are expected to be billed and collected within 12 $22.2 $20.8 December 31, 2017, December 31, 2016, not 12 $8.6 $9.8 December 31, 2017 2016, Allowance for doubtful accounts are summarized below: Balance at Beginning of Period Charged to Costs and Expenses Deductions/ Write-offs of Accounts Balance at End of Period Allowance for doubtful accounts 201 7 $ 200 $ 174 $ — $ 374 201 6 $ 299 $ — $ 99 $ 200 201 5 $ 381 $ — $ 82 $ 299
Research, Development, and Computer Software, Policy [Policy Text Block]	Software Development Costs — Internally developed software includes software developed to meet our internal needs to provide solution implementation services to our end-customers. These capitalized costs consist of internal compensation related costs and external direct costs incurred during the application development stage and are amortized over their useful lives, generally six not
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
Income Tax, Policy [Policy Text Block]	Income Taxes not not No not not 50%
Earnings Per Share, Policy [Policy Text Block]	Net Income Per Share – No
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 statements of operations and comprehensive income.
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 not not two three
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, 2017, not no no
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements — In May 2014, No. 2014 09, 606 605 . Under Topic 606, five December 15, 2017, . In addition, the standard requires enhanced disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The guidance permits two . Topic 606 first 2018. . The use of the modified retrospective transition method requires us to evaluate only contracts that were in effect at the beginning of fiscal 2018 those contracts had been accounted for under Topic 606 not In preparation for adoption of the standard, we are implementing changes to policies, processes and controls related to revenue recognition . We do not While the Company ’s adoption and evaluation of the impact of this new guidance is not Generally , we expect revenue generated under Topic 606 605, 606, 2018 The adoption of Topic 606 software multi-element arrangements (“MEA”) that combine software-related deliverables, which may 605 606 More judgments and estimates are required under Topic 606 605, arrangements with multiple elements and estimating the amount of variable consideration within our Integrated Yield Ramp (or IYR) engagements that include a Gainshare element. Due to the complexity of certain of our commercial contracts that include contingent variable fees, the actual revenue recognition treatment required under Topic 606 may 605. may Topic 606 our commission rates paid for renewals are commensurate with the rates paid for initial contracts, we will recognize the deferred direct costs over the contract term. The modified retrospective transition approach allows us to avoid restating comparative years, however in 2018, 606 605 . In February 2016, No. 2016 02, 842 ’ financial statements issued for fiscal years beginning after December 15, 2018, In August 2016, No. 2016 15, December 15, 2017, not In November 2016, No. 2016 18, December 31, 2018, In January 2017, No. 2017 01, December 15, 2017. The Company does not In January 2017, No. 2017 04, 350 No. 2017 04” No. 2017 04 2 December 15, 2019, not In May 2017, No. 2017 09, 718 No. 2017 09” No. 2017 09 718. December 15, 2017. In February 2018, No. 2018 02, 220 December 2017. December 15, 2018 The Company does not

Note 1 - Business and Signifi20

Note 1 - Business and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Property Plant and Equipment Estimated Useful Lives [Table Text Block]	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 [Table Text Block]	Balance at Beginning of Period Charged to Costs and Expenses Deductions/ Write-offs of Accounts Balance at End of Period Allowance for doubtful accounts 201 7 $ 200 $ 174 $ — $ 374 201 6 $ 299 $ — $ 99 $ 200 201 5 $ 381 $ — $ 82 $ 299

Note 2 - Property and Equipme21

Note 2 - Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Property, Plant and Equipment [Table Text Block]	December 31, 201 7 201 6 Computer equipment $ 10,729 $ 10,642 Software 3,348 1,679 Furniture, fixtures, and equipment 3,676 1,185 Leasehold improvements 1,980 1,132 Test equipment 13,796 11,723 Construction-in-progress 12,527 9,550 46,056 35,911 Accumulated depreciation (20,670 ) (16,570 ) Total $ 25,386 $ 19,341

Note 3 - Business Combination (

Note 3 - Business Combination (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	(in thousand) Amortization period (years) Finite-lived intangible assets : Developed technology $ 1,720 9 Customer relationship 820 9 Tradename 180 7 Deferred revenue (190 ) Other receivables 53 Net asset acquired $ 2,583 Goodwill 1,708 Purchase consideration $ 4,291

Note 4 - Goodwill and Intangi23

Note 4 - Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Goodwill [Table Text Block]	December 31, 201 7 Balance as of December 31, 201 6 $ 215 Add: Goodwill from acquisition 1,708 Goodwill adjustment - Balance as of December 31, 201 7 $ 1,923
Schedule of Finite-Lived Intangible Assets [Table Text Block]	December 31, 201 7 Decemb er 31, 201 6 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 $ 6,740 $ (4,145 ) $ 2,595 $ 5,920 $ (3,825 ) $ 2,095 Developed technology 4 - 6 15,820 (12,829 ) 2,991 14,100 (12,359 ) 1,741 Tradename 2 - 4 790 (622 ) 168 610 (583 ) 27 Backlog 1 100 (100 ) - 100 (100 ) - Patent 7 - 10 1,800 (1,480 ) 320 1,800 (1,440 ) 360 Other acquired intangibles 4 255 (255 ) - 255 (255 ) - Total $ 25,505 $ (19,431 ) $ 6,074 $ 22,785 $ (18,562 ) $ 4,223
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year Ending December 31, 201 8 $ 1,009 201 9 1,009 20 20 1,009 202 1 833 202 2 626 202 3 and thereafter 1,588 Total future amortization expense $ 6,074

Note 5 - Commitments and Cont24

Note 5 - Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Year Ending December 31, 201 8 $ 1,767 201 9 535 20 20 445 202 1 361 202 2 101 202 3 and thereafter 26 Total future minimum lease payments $ 3,235

Note 6 - Stockholders' Equity (

Note 6 - Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	Years Ended December 31, 201 7 201 6 201 5 Cost of Design-to-silicon-yield solutions $ 4,606 $ 4,427 $ 3,914 Research and development 3,518 3,087 2,275 Selling, general and administrative 3,686 3,488 3,567 Stock-based compensation expense $ 11,810 $ 11,002 $ 9,756
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Stock Plans Employee Stock Purchase Plan 201 7 201 6 201 5 201 7 201 6 201 5 Expected life (in years) 4.42 4.4 4.5 1.25 1.25 1.25 Volatility 41.5 % 43.2 % 45.8 % 40.63 % 44.0 % 50.1 % Risk-free interest rate 1.81 % 1.34 % 1.37 % 1.25 % 0.50 % 0.34 % Expected dividend — — — — — —
Share-based Compensation, Stock Options, Activity [Table Text Block]	Outstanding Options 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, 201 5 2,352 7.65 Granted (weighted average fair value of $ 5.45 per share) 93 13.88 Exercised (655 ) 7.70 Canceled (23 ) 12.95 Expired (3 ) 12.91 Outstanding, December 31, 201 5 1,764 7.88 Granted (weighted average fair value of $5. 36 per share) 99 14.55 Exercised (393 ) 7.56 Canceled (31 ) 13.82 Expired (75 ) 13.80 Outstanding, December 31, 201 6 1,364 8.00 Granted (weighted average fair value of $5. 92 per share) 150 16.28 Exercised (440 ) 6.42 Canceled (25 ) 15.03 Expired (4 ) 16.46 Outstanding, December 31, 201 7 1,045 9.65 4.98 $ 6,654 Vested and expected to vest, December 31, 201 7 1,025 9.52 4.89 $ 6,641 Exercisable, December 31, 201 7 830 8.06 3.91 $ 6,472
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	Shares (in thousands) Weighted- Average Grant-Date Fair Value Nonvested, January 1, 201 5 941 17.38 Granted 720 15.92 Vested (453 ) 15.97 Forfeited (42 ) 17.27 Nonvested, December 31, 201 5 1,166 17.03 Granted 963 14.41 Vested (472 ) 17.00 Forfeited (115 ) 15.73 Nonvested, December 31, 201 6 1,542 15.50 Granted 849 16.43 Vested (646 ) 16.26 Forfeited (128 ) 15.71 Nonvested, December 31, 201 7 1,617 15.66

Note 7 - Income Taxes (Tables)

Note 7 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Year Ended December 31, 201 7 201 6 201 5 (In thousands) U.S. Current $ (141 ) $ 410 $ 2,022 Deferred (471 ) 208 1,549 Foreign Current 254 329 341 Withholding 1,654 2,898 3,089 Deferred (33 ) 8 14 Total provision $ 1,263 $ 3,853 $ 7,015
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended December 31, 201 7 201 6 201 5 Federal statutory tax provision $ (26 ) $ 4,534 $ 6,798 State tax provision (110 ) 283 465 Stock compensation expense (944 ) 45 677 Tax credits (2,769 ) (4,000 ) (4,166 ) Foreign tax, net 1,641 2,852 3,111 Tax Law Changes 3,247 — — Other 224 139 130 Tax provision $ 1,263 $ 3,853 $ 7,015
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, 201 7 201 6 Deferred tax assets Net operating loss carry forward $ 1,318 $ 1,768 Research and development and other credit carry forward 16,626 12,345 Foreign tax credit carry forward 1,754 — Accruals deductible in different periods 3,285 3,446 Intangible assets 1,325 2,573 Stock-based compensation 1,166 2,285 Valuation allowance (9,126 ) (6,798 ) Subtotal $ 16,348 $ 15,619 Deferred tax liabilities Fixed assets (835 ) (619 ) Net Deferred tax assets $ 15,513 $ 15,000
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	Amount Gross unrecognized tax benefits, January 1, 201 5 $ 10,428 Increases in tax positions for current year 720 Increase in tax positions for prior years 162 Lapse in statute of limitations (331 ) Gross unrecognized tax benefits, December 31, 201 5 10,979 Increases in tax positions for current year 1,118 Increases in tax positions for prior years 112 Lapse in statute of limitations (269 ) Gross unrecognized tax benefits, December 31, 201 6 11,940 Increases in tax positions for current year 1,166 Increases in tax positions for prior years - Lapse in statute of limitations (216 ) Gross unrecognized tax benefits, December 31, 2017 $ 12,889
Valuation Allowance of Deferred Tax Assets [Member]
Notes Tables
Summary of Valuation Allowance [Table Text Block]	Balance at Beginning of Period Charged to Costs and Expenses Balance assumed in acquisition Deductions/ Write-offs of Accounts Balance at End of Period Valuation allowance for deferred tax assets 201 7 $ 6,798 $ 2,328 $ 0 $ — $ 9,126 201 6 6,205 $ 593 $ 0 $ — $ 6,798 201 5 5,433 $ 557 $ 215 $ — $ 6,205

Note 8 - Net Income (Loss) Pe27

Note 8 - Net Income (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Year Ended December 31, 201 7 201 6 201 5 Numerator: Net income (loss) $ (1,337 ) $ 9,103 $ 12,407 Denominator: Basic weighted-average shares outstanding 32,038 31,373 31,424 Effect of dilutive options and restricted stock — 1,058 740 Diluted weighted-average shares outstanding 32,038 32,431 32,164 Net income (loss) per share – Basic $ (0.04 ) $ 0.29 $ 0.39 Net income (loss) per share – Diluted $ (0.04 ) $ 0.28 $ 0.39
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	December 31, 201 7 201 6 Outstanding options — 134 Nonvested shares of restricted stock units — 18 Employee Stock Purchase Plan — 121 Total — 273

Note 9 - Customer and Geograp28

Note 9 - Customer and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	Year Ended December 31, Customer 201 7 201 6 201 5 A 40 % 41 % 53 % B * 11 % 12 %
Receivables by Major Customers [Table Text Block]	December 31, Customer 201 7 201 6 A 41 % 42 % C 15 % 13 %
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	Year Ended December 31, 201 7 201 6 201 5 Revenues Percentage of Revenues Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 39,631 39 % $ 38,748 36 % $ 45,082 46 % China 17,872 18 11,436 11 1,125 1 Taiwan 12,494 12 15,216 14 7,862 8 Germany 9,990 10 17,253 16 23,198 24 Rest of the world 21,884 21 24,808 23 20,710 21 Total revenue $ 101,871 100 % $ 107,461 100 % $ 97,977 100 %
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	December 31, 201 7 201 6 United States $ 24,883 $ 18,818 Rest of the world 503 523 Total long-lived assets, net $ 25,386 $ 19,341

Note 10 - Financial Instrumen29

Note 10 - Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
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 $ 26,638 $ 26,638 $ — $ — 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 $ 26,456 $ 26,456 $ — $ —

Note 12 - Selected Quarterly 30

Note 12 - Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Quarterly Financial Information [Table Text Block]	Year Ended December 31, 201 7 Q1 Q2 Q3 Q4 (In thousands, except for per share amounts) Total revenues $ 24,289 $ 24,289 $ 26,517 $ 26,776 Gross profit $ 12,858 $ 12,910 $ 14,086 $ 14,495 Net income $ 517 $ 189 $ 590 $ (2,634 ) Net income per share: Basic $ 0.02 $ 0.01 $ 0.02 $ (0.08 ) Diluted $ 0.02 $ 0.01 $ 0.02 $ (0.08 ) Year Ended December 31, 201 6 Q1 Q2 Q3 Q4 (In thousands, except for per share amounts) Total revenues $ 25,081 $ 26,688 $ 27,259 $ 28,433 Gross profit $ 14,875 $ 16,034 $ 15,807 $ 16,297 Net income $ 2,061 $ 2,133 $ 1,984 $ 2,925 Net income per share: Basic $ 0.07 $ 0.07 $ 0.06 $ 0.09 Diluted $ 0.07 $ 0.07 $ 0.06 $ 0.09

Note 1 - Business and Signifi31

Note 1 - Business and Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Number of Reporting Units	1
Goodwill, Impairment Loss	$ 0	$ 0
Impact of Estimates Revisions on Net Income	$ (1,200)	$ 900
Impact of Estimates Revisions on Earnings per Share, Diluted	$ (0.04)	$ 0.03
Deferred Pre-contract Costs	$ 600	$ 500
Unbilled Receivables, Current	22,200	20,800
Unbilled Receivables, Not Billable, Amount Expected to be Collected after Next Twelve Months	$ 8,600	9,800
Capitalized Computer Software, Useful Life	6 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Loss Contingency Accrual	$ 0
Other Noncurrent Liabilities [Member]
Deferred Revenue, Noncurrent	$ 1,500	$ 1,500
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Customers [Member]
Concentration Risk, Percentage	57.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]
Concentration Risk, Percentage		55.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | One Customer [Member]
Concentration Risk, Percentage	40.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Two Customers [Member]
Concentration Risk, Percentage		52.00%

Note 1 - Business and Signifi32

Note 1 - Business and Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2017
Computer Equipment [Member]
Property, plant and equipment, useful life (Year)	3 years
Software and Software Development Costs [Member]
Property, plant and equipment, useful life (Year)	3 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, plant and equipment, useful life (Year)	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, plant and equipment, useful life (Year)	7 years
Leasehold Improvements [Member]
Property, plant and equipment, useful life	Shorter of estimated useful life or term of lease

Note 1 - Business and Signifi33

Note 1 - Business and Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Balance at Beginning of Period	$ 200	$ 299	$ 381
Charged to Costs and Expenses	174
Deductions/ Write-offs of Accounts		99	82
Balance at End of Period	$ 374	$ 200	$ 299

Note 2 - Property and Equipme34

Note 2 - Property and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Depreciation, Depletion and Amortization, Nonproduction	$ 4.8	$ 3.6	$ 2.6
DFI Test Equipment [Member]
Construction in Progress, Gross	$ 10.9	$ 8

Note 2 - Property and Equipme35

Note 2 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property and equipment, gross	$ 46,056	$ 35,911
Accumulated depreciation	(20,670)	(16,570)
Total	25,386	19,341
Computer Equipment [Member]
Property and equipment, gross	10,729	10,642
Software and Software Development Costs [Member]
Property and equipment, gross	3,348	1,679
Furniture and Fixtures [Member]
Property and equipment, gross	3,676	1,185
Leasehold Improvements [Member]
Property and equipment, gross	1,980	1,132
Test Equipment [Member]
Property and equipment, gross	13,796	11,723
Construction in Progress [Member]
Property and equipment, gross	$ 12,527	$ 9,550

Note 3 - Business Combination36

Note 3 - Business Combination (Details Textual) - Kinesys Software [Member] $ in Millions	Jul. 11, 2017USD ($)
Payments to Acquire Businesses, Gross	$ 4.3
Business Combination Contingent Consideration at Fair Value	0.5
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	0.6
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 1.7

Note 3 - Business Combination -

Note 3 - Business Combination - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jul. 11, 2017	Dec. 31, 2017	Dec. 31, 2016
Goodwill		$ 1,923	$ 215
Kinesys Software [Member]
Deferred revenue	$ (190)
Other receivables	53
Net asset acquired	2,583
Goodwill	1,708
Purchase consideration	4,291
Kinesys Software [Member] | Developed Technology Rights [Member]
Finite-lived intangible assets	$ 1,720
Finite-lived intangible assets, amortization period (Year)	9 years
Kinesys Software [Member] | Customer Relationships [Member]
Finite-lived intangible assets	$ 820
Finite-lived intangible assets, amortization period (Year)	9 years
Kinesys Software [Member] | Trade Names [Member]
Finite-lived intangible assets	$ 180
Finite-lived intangible assets, amortization period (Year)	7 years

Note 4 - Goodwill and Intangi38

Note 4 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill	$ 1,923	$ 215
Finite-Lived Intangible Assets, Net	$ 6,074	4,223
Finite-Lived Intangible Assets, Remaining Amortization Period	6 years 270 days
Amortization of Intangible Assets	$ 869	$ 805	$ 372
Impairment of Intangible Assets, Finite-lived	$ 0

Note 4 - Goodwill and Intangi39

Note 4 - Goodwill and Intangible Assets - Goodwill Activity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Balance	$ 215
Add: Goodwill from acquisition	1,708
Goodwill adjustment
Balance	$ 1,923

Note 4 - Goodwill and Intangi40

Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Gross Carrying Amount	$ 25,505	$ 22,785
Accumulated Amortization	(19,431)	(18,562)
Intangible assets, net	6,074	4,223
Customer Relationships [Member]
Gross Carrying Amount	6,740	5,920
Accumulated Amortization	(4,145)	(3,825)
Intangible assets, net	$ 2,595	2,095
Customer Relationships [Member] | Minimum [Member]
Amortization Period (Year)	1 year
Customer Relationships [Member] | Maximum [Member]
Amortization Period (Year)	9 years
Developed Technology Rights [Member]
Gross Carrying Amount	$ 15,820	14,100
Accumulated Amortization	(12,829)	(12,359)
Intangible assets, net	$ 2,991	1,741
Developed Technology Rights [Member] | Minimum [Member]
Amortization Period (Year)	4 years
Developed Technology Rights [Member] | Maximum [Member]
Amortization Period (Year)	6 years
Trade Names [Member]
Gross Carrying Amount	$ 790	610
Accumulated Amortization	(622)	(583)
Intangible assets, net	$ 168	27
Trade Names [Member] | Minimum [Member]
Amortization Period (Year)	2 years
Trade Names [Member] | Maximum [Member]
Amortization Period (Year)	4 years
Order or Production Backlog [Member]
Amortization Period (Year)	1 year
Gross Carrying Amount	$ 100	100
Accumulated Amortization	(100)	(100)
Intangible assets, net
Patents [Member]
Gross Carrying Amount	1,800	1,800
Accumulated Amortization	(1,480)	(1,440)
Intangible assets, net	$ 320	360
Patents [Member] | Minimum [Member]
Amortization Period (Year)	7 years
Patents [Member] | Maximum [Member]
Amortization Period (Year)	10 years
Other Intangible Assets [Member]
Amortization Period (Year)	4 years
Gross Carrying Amount	$ 255	255
Accumulated Amortization	(255)	(255)
Intangible assets, net

Note 4 - Goodwill and Intangi41

Note 4 - Goodwill and Intangible Assets - Annual Amortization of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
2,018	$ 1,009
2,019	1,009
2,020	1,009
2,021	833
2,022	626
2023 and thereafter	1,588
Total future amortization expense	$ 6,074	$ 4,223

Note 5 - Commitments and Cont42

Note 5 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leases, Rent Expense, Net	$ 2,300	$ 2,200	$ 2,100
Purchase Obligation, Due in Next Twelve Months	9,500
Loss Contingency Accrual	$ 0

Note 5 - Commitments and Cont43

Note 5 - Commitments and Contingencies - Future Minimum Lease Payments Under Noncancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2017USD ($)
2,018	$ 1,767
2,019	535
2,020	445
2,021	361
2,022	101
2023 and thereafter	26
Total future minimum lease payments	$ 3,235

Note 6 - Stockholders' Equity44

Note 6 - Stockholders' Equity (Details Textual) - USD ($)	May 31, 2017	Oct. 25, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2001
Allocated Share-based Compensation Expense			$ 11,810,000	$ 11,002,000	$ 9,756,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period			25,000	31,000	23,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			1,045,000	1,364,000	1,764,000	2,352,000
Share Price			$ 15.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			$ 5,300,000	$ 4,400,000	$ 6,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value			$ 300,000
Stock Repurchase Program, Authorized Amount		$ 25,000,000
Stock Repurchase Program, Period in Force		2 years
Treasury Stock, Shares, Acquired			842,182
Treasury Stock Acquired, Average Cost Per Share			$ 15.93
Treasury Stock, Value, Acquired, Cost Method			$ 13,418,000	$ 2,182,000	$ 14,525,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 11,600,000
Twenty Eleven Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	9,050,000
Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate	1.33
Common Stock, Capital Shares Reserved for Future Issuance			9,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			3,900,000
Shares Previously Issued Under the 2001 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							3,500,000
Two Thousand One Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period			500,000
Outside of the 2011, 2001 or IDS Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			0
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Common Stock, Capital Shares Reserved for Future Issuance			8,100,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			1 year 124 days
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate			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			200,000	173,000	110,000
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased			$ 9.33	$ 9	$ 12.57
Number Of ESPP Shares Available For Future Issuance			4,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 5.22	$ 3.69	$ 5.51
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options			$ 300,000
Stock Appreciation Rights (SARs) [Member]
Allocated Share-based Compensation Expense			(30,000)	$ 116,000	$ (5,000)
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 1,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			3 years 98 days
Employee Stock Option [Member] | Twenty Eleven Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Employee Stock Option [Member] | IDS Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 21,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 16.43	$ 14.41	$ 15.92

Note 6 - Stockholders' Equity -

Note 6 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allocation of recognized period costs	$ 11,810	$ 11,002	$ 9,756
Cost of Sales [Member]
Allocation of recognized period costs	4,606	4,427	3,914
Research and Development Expense [Member]
Allocation of recognized period costs	3,518	3,087	2,275
Selling, General and Administrative Expenses [Member]
Allocation of recognized period costs	$ 3,686	$ 3,488	$ 3,567

Note 6 - Stockholders' Equity46

Note 6 - Stockholders' Equity - Stock Options, Valuation Assumptions (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock Plans [Member]
Expected life (Year)	4 years 153 days	4 years 146 days	4 years 182 days
Volatility	41.50%	43.20%	45.80%
Risk-free interest rate	1.81%	1.34%	1.37%
Expected dividend	0.00%	0.00%	0.00%
Employee Stock Purchase Plan [Member]
Expected life (Year)	1 year 91 days	1 year 91 days	1 year 91 days
Volatility	40.63%	44.00%	50.10%
Risk-free interest rate	1.25%	0.50%	0.34%
Expected dividend	0.00%	0.00%	0.00%

Note 6 - Stockholders' Equity47

Note 6 - Stockholders' Equity - Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Outstanding (in shares)	1,364	1,764	2,352
Outstanding (in dollars per share)	$ 8	$ 7.88	$ 7.65
Granted (in shares)	150	99	93
Granted (in dollars per share)	$ 16.28	$ 14.55	$ 13.88
Exercised (in shares)	(440)	(393)	(655)
Exercised (in dollars per share)	$ 6.42	$ 7.56	$ 7.70
Canceled (in shares)	(25)	(31)	(23)
Canceled (in dollars per share)	$ 15.03	$ 13.82	$ 12.95
Expired (in shares)	(4)	(75)	(3)
Expired (in dollars per share)	$ 16.46	$ 13.80	$ 12.91
Outstanding (in shares)	1,045	1,364	1,764
Outstanding (in dollars per share)	$ 9.65	$ 8	$ 7.88
Outstanding (Year)	4 years 357 days
Outstanding	$ 6,654
Vested and expected to vest, December 31, 2017 (in shares)	1,025
Vested and expected to vest, December 31, 2017 (in dollars per share)	$ 9.52
Vested and expected to vest, December 31, 2017 (Year)	4 years 324 days
Vested and expected to vest, December 31, 2017	$ 6,641
Exercisable, December 31, 2017 (in shares)	830
Exercisable, December 31, 2017 (in dollars per share)	$ 8.06
Exercisable, December 31, 2017 (Year)	3 years 332 days
Exercisable, December 31, 2017	$ 6,472

Note 6 - Stockholders' Equity48

Note 6 - Stockholders' Equity - Stock Options Activity (Details) (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Weighted average fair value (in dollars per share)	$ 5.92	$ 5.36	$ 5.45

Note 6 - Stockholders' Equity49

Note 6 - Stockholders' Equity - Nonvested Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Nonvested, Balance (in shares)	1,542	1,166	941
Nonvested, Balance (in dollars per share)	$ 15.50	$ 17.03	$ 17.38
Granted (in shares)	849	963	720
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 16.43	$ 14.41	$ 15.92
Vested (in shares)	(646)	(472)	(453)
Vested (in dollars per share)	$ 16.26	$ 17	$ 15.97
Forfeited (in shares)	(128)	(115)	(42)
Forfeited (in dollars per share)	$ 15.71	$ 15.73	$ 17.27
Granted (in dollars per share)	16.43	14.41	15.92
Vested (in dollars per share)	16.26	17	15.97
Forfeited (in dollars per share)	$ 15.71	$ 15.73	$ 17.27
Nonvested, Balance (in shares)	1,617	1,542	1,166
Nonvested, Balance (in dollars per share)	$ 15.66	$ 15.50	$ 17.03

Note 7 - Income Taxes (Details

Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 17, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		0.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 3.20
Income (Loss) from Continuing Operations before Income Taxes, Domestic		(1,200,000)	$ 11,300,000	$ 17,700,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign		1,100,000	1,600,000	1,700,000
Deferred Tax Assets, Valuation Allowance		9,126,000	6,798,000
Deferred Tax Assets, Net		15,513,000	15,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		700,000	600,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		135,000	72,000	28,000
Unrecognized Tax Benefits		12,889,000	11,940,000	$ 10,979,000		$ 10,428,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		7,700,000
Unrecognized Tax Benefits In Long Term Liabilities		3,100,000
Unrecognized Tax Benefits In Deferred Tax Assets		9,800,000
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance		5,200,000
Domestic Tax Authority [Member]
Tax Credit Carryforward, Amount		13,000,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards		3,200,000
State and Local Jurisdiction [Member]
Tax Credit Carryforward, Amount		16,500,000
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforwards		5,600,000
Deferred Tax Assets, Valuation Allowance		$ 9,000,000	$ 6,700,000
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] | Syntricity [Member]
Operating Loss Carryforwards					$ 100,000
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%

Note 7 - Income Taxes - Income

Note 7 - Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S.
Current	$ (141)	$ 410	$ 2,022
Deferred	(471)	208	1,549
Foreign
Current	254	329	341
Withholding	1,654	2,898	3,089
Deferred	(33)	8	14
Tax provision	$ 1,263	$ 3,853	$ 7,015

Note 7 - Income Taxes - Incom52

Note 7 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal statutory tax provision		$ (26)	$ 4,534	$ 6,798
State tax provision		(110)	283	465
Stock compensation expense	[1]	(944)	45	677
Tax credits		(2,769)	(4,000)	(4,166)
Foreign tax, net		1,641	2,852	3,111
Tax Law Changes		3,247
Other		224	139	130
Tax provision		$ 1,263	$ 3,853	$ 7,015
[1]	Due to the adoption of ASU 2016-09, excess tax benefits from share-based award activity for the year ended December 31, 2016 are reflected as a reduction of the provision for income taxes, whereas they previously were recognized in equity. See Note 1 "Business and Significant Accounting Policies" in the Notes to the Consolidated Financial Statements for additional information related to this adoption.

Note 7 - Income Taxes - Deferre

Note 7 - Income Taxes - Deferred Tax Assets (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets
Net operating loss carry forward	$ 1,318,000	$ 1,768,000
Research and development and other credit carry forward	16,626,000	12,345,000
Foreign tax credit carry forward	1,754,000
Accruals deductible in different periods	3,285,000	3,446,000
Intangible assets	1,325,000	2,573,000
Stock-based compensation	1,166,000	2,285,000
Valuation allowance	(9,126,000)	(6,798,000)
Subtotal	16,348,000	15,619,000
Deferred tax liabilities
Fixed assets	(835,000)	(619,000)
Net Deferred tax assets	$ 15,513,000	$ 15,000,000

Note 7 - Income Taxes - Unrecog

Note 7 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gross unrecognized tax benefits	$ 11,940	$ 10,979	$ 10,428
Increases in tax positions for current year	1,166	1,118	720
Increase in tax positions for prior years		112	162
Lapse in statute of limitations	(216)	(269)	(331)
Gross unrecognized tax benefits	$ 12,889	$ 11,940	$ 10,979

Note 7 - Income Taxes - Valuati

Note 7 - Income Taxes - Valuation Allowance of Deferred Tax Assets (Details) - Valuation Allowance of Deferred Tax Assets [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Balance at Beginning of Period	$ 6,798	$ 6,205	$ 5,433
Charged to Costs and Expenses	2,328	593	557
Balance assumed in acquisition	0	0	215
Deductions/ Write-offs of Accounts
Balance at End of Period	$ 9,126	$ 6,798	$ 6,205

Note 8 - Net Income (Loss) Pe56

Note 8 - Net Income (Loss) Per Share - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income (loss)	$ (2,634)	$ 590	$ 189	$ 517	$ 2,925	$ 1,984	$ 2,133	$ 2,061	$ (1,337)	$ 9,103	$ 12,407
Basic weighted-average shares outstanding (in shares)									32,038	31,373	31,424
Effect of dilutive options and restricted stock (in shares)										1,058	740
Diluted weighted-average shares outstanding (in shares)									32,038	32,431	32,164
Net income (loss) per share – Basic (in dollars per share)	$ (0.08)	$ 0.02	$ 0.01	$ 0.02	$ 0.09	$ 0.06	$ 0.07	$ 0.07	$ (0.04)	$ 0.29	$ 0.39
Net income (loss) per share – Diluted (in dollars per share)	$ (0.08)	$ 0.02	$ 0.01	$ 0.02	$ 0.09	$ 0.06	$ 0.07	$ 0.07	$ (0.04)	$ 0.28	$ 0.39

Note 8 - Net Income (Loss) Pe57

Note 8 - Net Income (Loss) Per Share - Anti-dilutive Securities (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Anti-dilutive securities (in shares)		273
Employee Stock Option [Member]
Anti-dilutive securities (in shares)		134
Restricted Stock Units RSU Nonvested [Member]
Anti-dilutive securities (in shares)		18
Employee Stock Purchase Plan [Member]
Anti-dilutive securities (in shares)		121

Note 9 - Customer and Geograp58

Note 9 - Customer and Geographic Information (Details Textual)	12 Months Ended
	Dec. 31, 2017
Number of Operating Segments	1
Number of Reportable Segments	1

Note 9 - Customer and Geograp59

Note 9 - Customer and Geographic Information - Revenue Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Sales Revenue, Net [Member]	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Customer A [Member]
Revenue Percentage by Major Customer	40.00%		41.00%	53.00%
Customer B [Member]
Revenue Percentage by Major Customer		[1]	11.00%	12.00%
[1]	represents less than 10%

Note 9 - Customer and Geograp60

Note 9 - Customer and Geographic Information - Receivables Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Accounts Receivable [Member]	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Customer A [Member]
Revenue Percentage by Major Customer	41.00%	42.00%
Customer B [Member]
Revenue Percentage by Major Customer	15.00%	13.00%

Note 9 - Customer and Geograp61

Note 9 - Customer and Geographic Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues	$ 26,776	$ 26,517	$ 24,289	$ 24,289	$ 28,433	$ 27,259	$ 26,688	$ 25,081	$ 101,871	$ 107,461	$ 97,977
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenues									$ 101,871	$ 107,461	$ 97,977
Concentration Risk, Percentage									100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES
Revenues									$ 39,631	$ 38,748	$ 45,082
Concentration Risk, Percentage									39.00%	36.00%	46.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | CHINA
Revenues									$ 17,872	$ 11,436	$ 1,125
Concentration Risk, Percentage									18.00%	11.00%	1.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | TAIWAN, PROVINCE OF CHINA
Revenues									$ 12,494	$ 15,216	$ 7,862
Concentration Risk, Percentage									12.00%	14.00%	8.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | GERMANY
Revenues									$ 9,990	$ 17,253	$ 23,198
Concentration Risk, Percentage									10.00%	16.00%	24.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Rest of the World [Member]
Revenues									$ 21,884	$ 24,808	$ 20,710
Concentration Risk, Percentage									21.00%	23.00%	21.00%

Note 9 - Customer and Geograp62

Note 9 - Customer and Geographic Information - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Long-lived assets	$ 25,386	$ 19,341
UNITED STATES
Long-lived assets	24,883	18,818
Rest of the World [Member]
Long-lived assets	$ 503	$ 523

Note 10 - Financial Instrumen63

Note 10 - Financial Instruments (Details Textual) - Foreign Exchange Contract [Member] - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Asset, Notional Amount	$ 8,200,000
Other Current Assets [Member]
Derivative Asset, Current	12,000
Other Nonoperating Income (Expense) [Member]
Derivative, Gain (Loss) on Derivative, Net	$ 700,000	$ (400,000)	$ (800,000)

Note 10 - Financial Instrumen64

Note 10 - Financial Instruments - Fair Value, Assets Measured on a Recurring Basis (Details) - Money Market Funds [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Money market mutual funds	$ 26,638	$ 26,456
Fair Value, Inputs, Level 1 [Member]
Money market mutual funds	26,638	26,456
Fair Value, Inputs, Level 2 [Member]
Money market mutual funds
Fair Value, Inputs, Level 3 [Member]
Money market mutual funds

Note 11 - Employee Benefit Pl65

Note 11 - Employee Benefit Plan (Details Textual)	12 Months Ended
	Dec. 31, 2017
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	15.00%

Note 12 - Selected Quarterly 66

Note 12 - Selected Quarterly Financial Data (Unaudited) - Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues	$ 26,776	$ 26,517	$ 24,289	$ 24,289	$ 28,433	$ 27,259	$ 26,688	$ 25,081	$ 101,871	$ 107,461	$ 97,977
Gross profit	14,495	14,086	12,910	12,858	16,297	15,807	16,034	14,875	54,350	63,013	58,954
Net income (loss)	$ (2,634)	$ 590	$ 189	$ 517	$ 2,925	$ 1,984	$ 2,133	$ 2,061	$ (1,337)	$ 9,103	$ 12,407
Basic (in dollars per share)	$ (0.08)	$ 0.02	$ 0.01	$ 0.02	$ 0.09	$ 0.06	$ 0.07	$ 0.07	$ (0.04)	$ 0.29	$ 0.39
Diluted (in dollars per share)	$ (0.08)	$ 0.02	$ 0.01	$ 0.02	$ 0.09	$ 0.06	$ 0.07	$ 0.07	$ (0.04)	$ 0.28	$ 0.39