PDF Solutions (PDFS) 10-K 8 Mar 19 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Mar. 01, 2019	Jun. 30, 2018
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 Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding (in shares)		32,595,723
Entity Public Float			$ 291.1
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Shell Company	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 96,089	$ 101,267
Accounts receivable, net of allowances of $332 and $374, respectively	51,570	57,564
Prepaid expenses and other current assets	9,562	5,069
Total current assets	157,221	163,900
Property and equipment, net	35,681	25,386
Goodwill	1,923	1,923
Intangible assets, net	5,064	6,074
Deferred tax assets	19,044	16,348
Other non-current assets	6,972	10,545
Total assets	225,905	224,176
Current liabilities:
Accounts payable	2,454	2,536
Accrued compensation and related benefits	4,727	6,493
Accrued and other current liabilities	3,235	2,627
Deferred revenues – current portion	8,477	7,981
Billings in excess of recognized revenues	635
Total current liabilities	19,528	19,637
Long-term income taxes payable	3,751	3,902
Other non-current liabilities	2,831	2,269
Total liabilities	26,110	25,808
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 40,677 and 39,799, respectively; shares outstanding 32,382 and 32,112, respectively	5	5
Additional paid-in capital	310,660	297,950
Treasury stock, at cost, 8,295 and 7,688 shares, respectively	(79,142)	(71,793)
Accumulated deficit	(30,452)	(27,089)
Accumulated other comprehensive loss	(1,276)	(705)
Total stockholders’ equity	199,795	198,368
Total liabilities and stockholders’ equity	$ 225,905	$ 224,176

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts receivable, allowance	$ 332	$ 374
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)	40,677	39,799
Common stock, shares outstanding (in shares)	32,382	32,112
Treasury stock, shares (in shares)	8,295	7,688

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	$ 85,794	$ 101,871	$ 107,461
Costs of Design-to-silicon-yield solutions:
Gross profit	42,991	54,350	63,013
Operating expenses:
Research and development	27,998	30,078	27,559
Selling, general and administrative	23,934	23,684	22,056
Amortization of other acquired intangible assets	435	398	432
Restructuring charges	576
Total operating expenses	52,943	54,160	50,047
Income (loss) from operations	(9,952)	190	12,966
Interest and other income (expense), net	493	(264)	(10)
Income (loss) before income taxes	(9,459)	(74)	12,956
Income tax benefit	(1,743)	1,263	3,853
Net income (loss)	$ (7,716)	$ (1,337)	$ 9,103
Net income (loss) per share:
Basic (in dollars per share)	$ (0.24)	$ (0.04)	$ 0.29
Diluted (in dollars per share)	$ (0.24)	$ (0.04)	$ 0.28
Weighted average common shares:
Basic (in shares)	32,169	32,038	31,373
Diluted (in shares)	32,169	32,038	32,431
Net loss	$ (7,716)	$ (1,337)	$ 9,103
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	(571)	1,286	(448)
Comprehensive income (loss)	(8,287)	(51)	8,655
License and Service [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	60,081	74,436	77,162
Costs of Design-to-silicon-yield solutions:
Direct costs of Design-to-silicon-yield solutions	42,228	47,050	44,074
Amortization of acquired technology	575	471	374
Total cost of Design-to-silicon-yield solutions	42,803	47,521	44,448
Gainshare Performance Incentives [Member]
Revenues:
Revenue from Contract with Customer, Including Assessed Tax	$ 25,713	$ 27,435	$ 30,299

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, 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
Comprehensive loss				9,103	(448)	8,655
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
Cumulative-effect adjustment from adoption | Accounting Standards Update 2016-09 [Member]				4,925		4,925
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
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)
Comprehensive loss				(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
Issuance of common stock in connection with employee stock purchase plan (in shares)	201
Issuance of common stock in connection with employee stock purchase plan		1,831				$ 1,831
Issuance of common stock in connection with exercise of options (in shares)	81					81,000
Issuance of common stock in connection with exercise of options		560				$ 560
Vesting of restricted stock units (in shares)	425
Vesting of restricted stock units
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			170
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (2,101)			(2,101)
Repurchases of common stock (in shares)	(437)		437
Repurchases of common stock			$ (5,248)			(5,248)
Stock-based compensation expense		10,319				10,319
Comprehensive income				(7,716)	(571)	(8,287)
Comprehensive loss				(7,716)	(571)	(8,287)
Balances (in shares) at Dec. 31, 2018	32,382		8,295
Balances at Dec. 31, 2018	$ 5	310,660	$ (79,142)	(30,452)	(1,276)	199,795
Cumulative-effect adjustment from adoption | Accounting Standards Update 2014-09 [Member]				$ 4,353		$ 4,353

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ (7,716)	$ (1,337)	$ 9,103
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	4,967	4,789	3,584
Stock-based compensation expense	10,295	11,810	11,002
Amortization of acquired intangible assets	1,010	869	805
Deferred taxes	(4,171)	(504)	216
Provision for (reversal of) allowance for doubtful accounts	(42)	174	(99)
Unrealized loss (gain) on foreign currency forward contract	67	(27)	(47)
Loss on disposal and write-down in value of property and equipment	230	6	107
Adjustment to contingent consideration related to acquisition	114
Changes in operating assets and liabilities:
Accounts receivable	6,828	(9,581)	(14,620)
Prepaid expenses and other current assets	(2,115)	373	(1,688)
Other non-current assets	3,560	2,103	(10,988)
Accounts payable	(1,406)	1,963	85
Accrued compensation and related benefits	(1,609)	249	1,178
Accrued and other liabilities	240	72	(231)
Deferred revenue	2,451	(326)	4,772
Billings in excess of recognized revenues	635	(88)	(1,179)
Net cash provided by operating activities	13,338	10,545	2,000
Cash flows from investing activities:
Purchases of property and equipment	(13,116)	(10,255)	(11,282)
Payments of business acquisitions, net of cash acquired		(3,841)
Net cash used in investing activities	(13,116)	(14,096)	(11,282)
Cash flows from financing activities:
Payment of contingent consideration related to acquisition	(244)
Proceeds from exercise of stock options	560	2,822	2,972
Repurchases of common stock	(5,248)	(13,418)	(2,182)
Proceeds from employee stock purchase plan	1,831	1,865	1,557
Payments for taxes related to net share settlement of equity awards	(2,101)	(3,493)	(2,317)
Net cash provided by (used in) financing activities	(5,202)	(12,224)	30
Effect of exchange rate changes on cash and cash equivalents	(198)	255	(119)
Net decrease in cash and cash equivalents	(5,178)	(15,520)	(9,371)
Cash and cash equivalents, beginning of year	101,267	116,787	126,158
Cash and cash equivalents, end of year	96,089	101,267	116,787
Supplemental disclosure of cash flow information:
Taxes	2,582	2,244	3,635
Property and equipment received and accrued in accounts payable and accrued and other liabilities	2,101	1,235	666
Tenant allowance paid by landlord for leasehold improvements	$ 1,536

Note 1 - Description of Busines

Note 1 - Description of Business and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. DESCRIP TION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Description of Business PDF Solutions, Inc. (the “Company” or “PDF”), provides differentiated data and analytics solutions to the semiconductor and electronics industries. The Company offers an end-to-end analytics platform that empowers engineers and data scientists across the semiconductor ecosystem to rapidly improve the yield, quality, and profitability of their products. 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, 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, 2018, two 56% one 37% 2018. December 31, 2017, two 56% one 40% 2017. 11 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 (in years) of the related asset as follows: Computer equipment 3 Software 3 Furniture, fixtures, equipment and test equipment 3 - 10 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 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 December 31, 2018 2017. not 12 $5.3 $8.6 December 31, 2018 2017, Allowance for doubtful accounts are summarized below (in thousands): Balance at Beginning of Period Charged to Costs and Expenses Deductions/ Write-offs of Accounts Balance at End of Period Allowance for doubtful accounts 2018 $ 374 $ — $ 42 $ 332 2017 $ 200 $ 174 $ — $ 374 2016 $ 299 $ — $ 99 $ 200 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 consist primarily of personnel-related costs to support product development activities, including compensation and benefits, outside development services, travel, facilities cost allocations, and stock-based compensation charges. 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 The Company's provision for income tax comprises its current tax liability and change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities. The measurement of current and deferred tax assets and liabilities is based on provisions of enacted tax laws; the effect of future changes in tax laws or rates are not not No not not 50% Net Income (Loss) Per Share Basic net income (loss) 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 (loss) per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. Dilutive potential common shares consist of incremental common shares issuable upon exercise of stock options, upon vesting of restricted stock units, contingently issuable shares for all periods and assumed issuance of shares under employee stock purchase plan. No 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 (loss). 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 forward 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, 2018, not no no Recently Adopted Accounting Pronouncements In May 2014, No. 2014 09, 606 605 606, five first first 2018. 2 In August 2016, No. 2016 15, 230 December 15, 2017, January 1, 2018, not In November 2016, No. 2016 18, 230 December 15, 2017, January 1, 2018, not In January 2017, No. 2017 01, December 15, 2017. January 1, 2018, not In May 2017, No. 2017 09, 718 718. December 15, 2017. January 1, 2018, not In March 2018, No. 2018 05, 740 No. 118. December 22, 2017, 118 118 740 not one 118, December 31, 2017 first three 2018. December 31, 2018. 9, Recent Accounting Standards or Updates Not In February 2016, No. 2016 02, 842 December 15, 2018, July 2018, No. 2018 11 842 No. 2018 11 No. 2018 11, No. 2018 11 No. 2016 02 December 2018, No. 2018 20, 842 first 2019 No. 2018 11. In January 2017, No. 2017 04, 350 2 December 15, 2019, not In February 2018, No. 2018 02, 220 December 2017. December 15, 2018 not In August 2018, No. 2018 15, 350 40 first 2020. No. 2018 15 not

Note 2 - Revenue Recognition

Note 2 - Revenue Recognition	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	2. On January 1, 2018, 606, not January 1, 2018. 2018 606 not The Company also considered the impact of subtopic ASC 340 40. 606, 340 40, The most significant impacts of the adoption of Topic 606 ● At the adoption date, the Company recorded a net decrease of $4.4 606 605, January 1, 2018 $0.8 $1.9 $2.5 $0.5 ● For fiscal 2018, 606 605. 605 2018 December 31, 2018 $1.2 The adoption of Topic 606 may 605 606 605. Under the Company’s previous accounting practices, revenue was recognized from Gainshare performance incentive agreements in the period of receipt of related Gainshare acknowledgement reports, which was generally one 606, not Under Topic 605, 606, The following table summarizes the effects of adopting Topic 606 December 31, 2018: (In thousands) As reported under Topic 606 Adjustments Balances under Topic 605 Accounts receivable, net of allowance $ 51,570 $ (979 ) $ 50,591 Prepaid expenses and other current assets 9,562 (2,980 ) 6,582 Deferred tax assets 19,044 443 19,487 Other non-current assets 6,972 (34 ) 6,938 Deferred revenues – current portion 8,477 1,918 10,395 Long-term income taxes payable 3,751 (1,032 ) 2,719 Other non-current liabilities 2,831 787 3,618 Accumulated deficit (30,452 ) (5,223 ) (35,675 ) The Company’s net cash provided by operating activities for the year ended December 31, 2018 not 606. 606 December 31, 2018: (In thousands) As reported under Topic 606 Adjustments Balances under Topic 605 Net loss $ (7,716 ) $ (870 ) $ (8,586 ) Adjustments to reconcile loss to net cash provided by operating activities: Deferred taxes (4,171 ) (127 ) (4,298 ) Changes in operating assets and liabilities: Accounts receivable 6,828 187 7,015 Prepaid expenses and other current assets (2,115 ) 588 (1,527 ) Other non-current assets 3,560 34 3,594 Deferred revenue 2,451 188 2,639 The Company derives revenue from two Revenue is recognized when control of products or services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those promised products or services. The Company determines revenue recognition through the following five ● Identification of the performance obligations in the contract ● Determination of the transaction price ● Allocation of the transaction price to the performance obligations in the contract ● Recognition of revenue when, or as, performance obligations are satisfied The Company accounts for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The Company enters into contracts that can include various combinations of licenses, products and services, some of which are distinct and are accounted for as separate performance obligations. For contracts with multiple performance obligations, the Company allocates the transaction price of the contract to each performance obligation, generally on a relative basis using its standalone selling price. The Company does not one not December 31, 2018. Nature of Products and Services Design-to-silicon-yield Solutions —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. Revenue under project–based contracts for solution implementation services is recognized as services are performed using a percentage-of-completion method based on costs or labor-hours inputs. Due to the nature of the work performed in these arrangements, the estimation of costs or hours at completion is complex, subject to many variables and requires significant judgment. Key factors reviewed by the Company to estimate costs to complete each contract are future labor and product costs and expected productivity efficiencies. If circumstances arise that change the original estimates of revenues, costs, or the extent of progress toward completion, revisions to the estimates are made. These revisions may On occasion, the Company includes its products as a component of its fixed-price service contracts. In such instances, the Company determines whether the services performed and products included are distinct. In most cases, the arrangement is a single performance obligation and therefore, follows the pattern of transfer as the service is provided. The Company applies a measure of progress (typically hours-to-hours or cost-to-cost) to any fixed consideration. As a result, revenue is generally recognized over the period the services are performed using the percentage-of-completion method. This results in revenue recognition that corresponds with the value to the client of the services transferred to-date relative to the remaining services promised. The Company also licenses our Design-for-Inspection ("DFI") system as a separate component of fixed-price service contracts. The Company allocates revenue to all deliverables based on their SSPs. In such instances, the Company applies judgment to estimate the range of SSPs for each performance obligation. The Company licenses some of its software products separately from solution implementations, primarily its Exensio software platform and related products. The majority of these products are delivered as on-premise software licenses, while others can be delivered entirely or partially through Software-as-a-Service (SaaS) or cloud delivery models. Revenue from perpetual ( one Gainshare Performance Incentives — Contracts to provide yield improvement services have historically included two 1 2 The following table summarizes the effects of adopting Topic 606 December 31, 2018: (In thousands) As reported under Topic 606 Adjustments Balances under Topic 605 Design-to-silicon-yield solutions $ 60,081 $ (711 ) $ 59,370 Gainshare performance incentives 25,713 (470 ) 25,243 Total revenue 85,794 (1,181 ) 84,613 Gross profit 42,991 (1,181 ) 41,810 Selling, general and administrative 23,934 (75 ) 23,859 Total operating expenses 52,943 (75 ) 52,868 Loss from operations (9,952 ) (1,106 ) (11,058 ) Loss before taxes (9,459 ) (1,106 ) (10,565 ) Income tax benefit (1,743 ) (235 ) (1,978 ) Net loss $ (7,716 ) $ (870 ) $ (8,586 ) Disaggregation of revenue In accordance with ASC 606 10 50, The following table shows the revenues from contracts with customers by the nature of transactions for the year ended December 31, 2018 ( Year Ended December 31, 2018 Licenses and Gainshare Performance Incentives $ 31,336 Support and services 53,486 Other 972 Total $ 85,794 Licenses and Gainshare Performance Incentives revenue is comprised of (i) the software license fees for perpetual and time-based software license contracts where the standalone selling prices are estimable by the Company, or distinct and separate performance obligations; and (ii) the variable fee component of the Company’s yield improvement service contracts, or Gainshare Performance Incentives, which is usually recognized as revenue subsequent to the delivery of all contractual services and performance obligations. The services component of such contracts, including recurring fees for unspecified software updates and technical support, is presented as support and services. Under Topic 606, 63% 37% December 31, 2018, 60%, 61% 64% December 31, 2018, 2017 2016, 11, Significant Judgments More judgments and estimates are required under Topic 606 605. 606 may may In services arrangements, the Company typically satisfies the performance obligation and recognizes revenue over time. In service arrangements, the performance obligation is satisfied over time either because the client controls the asset as it is created (e.g., when the asset is built at the customer site) or because the Company’s performance does not For revenue under project–based contracts for fixed-price solution implementation services, revenue is recognized as services are performed using the percentage-of-completion method based on costs or the labor-hours input method, whichever is the most appropriate measure of the progress towards completion of the contract. Due to the nature of the work performed in these arrangements, the estimation of percentage-of-completion is complex, subject to many variables and requires significant judgment. Key factors reviewed by the Company to estimate costs to complete each contract are future labor and product costs and expected productivity efficiencies. If circumstances arise that change the original estimates of revenues, costs, or extent of progress toward completion, revisions to the estimates are made. These revisions may The Company is required to record Gainshare performance incentives revenue in the same period in which the usage occurs. Because the Company generally does not Contract Balances The Company performs its obligation under a contract with a customer by transferring products or services in exchange for consideration from the customer. The timing of the Company’s performance often differs from the timing of the customer’s payment, which results in the recognition of a receivable, a contract asset, or a contract liability. The Company classifies the right to consideration in exchange for products or services transferred to a client as either a receivable or a contract asset. A receivable is a right to consideration that is unconditional as compared to a contract asset which is a right to consideration that is conditional upon factors other than the passage of time. The majority of the Company’s contract assets represent unbilled amounts related to fixed-price solution implementation service contracts when the costs or labor-hours input method of revenue recognition is utilized and revenue recognized exceeds the amount billed to the client, and the right to consideration is subject to milestone completion or client acceptance. The contract assets are generally classified as current and are recorded on a net basis with deferred revenue (i.e. contract liabilities) at the contract level. The contract assets are included in prepaid expenses and other current assets in the consolidated balance sheets at beginning of 2018. 2018 $1.9 $2.7 December 31, 2018. twelve $1.0 $0.9 December 31, 2018 January 1, 2018. During the year ended December 31, 2018, $6.3 606, 2018. At December 31, 2018, $47.1 two five not not one Payment terms and conditions vary by contract type, although terms generally include a requirement of payment within 30 90 not not During the year ended December 31, 2018, $1.8 Costs to obtain or fulfill a contract The Company capitalizes the incremental costs to obtain or fulfill a contract with a customer, including direct sales commissions and related fees, when it expects to recover those costs. As a result, these costs will need to be capitalized and amortized over an appropriate period, which may not not December 31, 2018, $0.5 $0.4 December 31, 2018. no no no $0.2 $0.6 December 31, 2018 December 31, 2017,

Note 3 - Property and Equipment

Note 3 - Property and Equipment	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	3 . PROPERTY AND EQUIPMENT Property and equipment consist of (in thousands): December 31, 2018 2017 Computer equipment $ 10,536 $ 10,729 Software 4,112 3,348 Furniture, fixtures, and equipment 4,688 3,676 Leasehold improvements 5,474 1,980 Test equipment 14,697 13,796 Construction-in-progress 20,293 12,527 59,800 46,056 Less: accumulated depreciation and amortization (24,119 ) (20,670 ) Total $ 35,681 $ 25,386 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 $17.4 $10.9 December 31, 2018, December 31, 2017, December 31, 2018, 2017, 2016 $5.0 $4.8 $3.6

Note 4 - Goodwill and Intangibl

Note 4 - Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	4 . GOODWILL AND INTANGIBLE ASSETS As of December 31, 2018 2017, $1.9 Intangible assets balance was $5.1 $6.1 December 31, 2018, December 31, 2017, December 31, 2018 2017, December 31, 2018 December 31, 2017 Amortization Gross Net Gross Net Period Carrying Accumulated Carrying Carrying Accumulated Carrying (Dollars in thousands) (Years) Amount Amortization Amount Amount Amortization Amount Customer relationships 1 - 9 $ 6,740 $ (4,514 ) $ 2,226 $ 6,740 $ (4,145 ) $ 2,595 Developed technology 4 - 9 15,820 (13,404 ) 2,416 15,820 (12,829 ) 2,991 Tradename 2 - 7 790 (648 ) 142 790 (622 ) 168 Patent 7 - 10 1,800 (1,520 ) 280 1,800 (1,480 ) 320 Total $ 25,150 $ (20,086 ) $ 5,064 $ 25,150 $ (19,076 ) $ 6,074 The weighted average amortization period for acquired identifiable intangible assets was 5.9 December 31, 2018. December 31, 2018, 2017, 2016 $1.0 $0.9 $0.8 Year Ending December 31, 2019 $ 1,009 2020 1,009 2021 833 2022 626 2023 626 2024 and thereafter 961 Total future amortization expense $ 5,064 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, 2018, no

Note 5 - Commitments and Contin

Note 5 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
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 2028. $2.5 $2.3 $2.2 2018, 2017, 2016, Future minimum lease payments under noncancelable operating leases at December 31, 2018, Year Ending December 31, 2019 $ 1,677 2020 1,811 2021 1,653 2022 1,484 2023 1,127 2024 and thereafter 3,673 Total future minimum lease payments $ 11,425 Indemnification s 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, 2018, $8.7 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 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, 2018, not no no

Note 6 - Stockholders' Equity

Note 6 - Stockholders' Equity	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Shareholders' Equity and Share-based Payments [Text Block]	6 . STOCKHOLDERS’ EQUITY Stock Repurchase Program On October 25, 2016, $25.0 two May 29, 2018, 2016 $25.0 two December 31, 2018, 437,000 $5.2 2016 no 2018 December 31, 2018, 1,279,000 $14.59 2016 $18.7 2018 December 31, 2018, $25.0

Note 7 - Employee Benefit Plans

Note 7 - Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Compensation and Employee Benefit Plans [Text Block]	7 . EMPLOYEE BENEFIT PLANS 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, 2018, 8,734,000 2018, 2017, 2016, 201,000, 200,000, 173,000, $9.12, $9.33, $9.00 December 31, 2018, 4,738,000 2018, 2017, 2016 $3.62, $5.22, $3.69 December 31, 2018, $1.5 1.58 Stock Incentive Plans 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, 2018, 9.6 2011 3.0 2011 0.5 2001 2011 December 31, 2018. December 31, 2018, no 2011, 2001 The Company has elected to use the Black-Scholes-Merton option-pricing model, which incorporates various assumptions including volatility, expected life, interest rate and expected dividend. 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 2018 2017 2016 2018 2017 2016 Expected life (in years) 4.43 4.42 4.40 1.25 1.25 1.25 Volatility 43.91 % 41.5 % 43.2 % 42.85 % 40.63 % 44.0 % Risk-free interest rate 2.73 % 1.81 % 1.34 % 2.48 % 1.25 % 0.50 % Expected dividend — — — — — — 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 Stock-based compensation expenses related to the Company’s stock plans and employee stock purchase plan were allocated as follows (in thousands): Years Ended December 31, 2018 2017 2016 Costs of Design-to-silicon-yield solutions $ 3,554 $ 4,606 $ 4,427 Research and development 3,260 3,518 3,087 Selling, general and administrative 3,481 3,686 3,488 Stock-based compensation expenses $ 10,295 $ 11,810 $ 11,002 The stock-based compensation expense for the years ended December 31, 2018, 2017, 2016 $24,000, $30,000, $116,000, Additional information with respect to options under the Plans is as follows: Outstanding Options Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding, January 1, 2016 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, 2016 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, 2017 1,045 $ 9.65 Granted (weighted average fair value of $4.08 per share) 116 $ 10.35 Exercised (81 ) $ 6.93 Canceled (30 ) $ 13.41 Expired (23 ) $ 13.16 Outstanding, December 31, 2018 1,027 $ 9.75 4.35 $ 1,121 Vested and expected to vest, December 31, 2018 1,006 $ 9.68 4.25 $ 1,121 Exercisable, December 31, 2018 796 $ 8.69 3.05 $ 1,121 The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $8.43 December 31, 2018, December 31, 2018, 2017, 2016 $0.4 $5.3 $4.4 As of December 31, 2018, $1.0 3.06 December 31, 2018, $0.4 Nonvested shares (restricted stock units) were as follows: Shares Fair Value Nonvested, January 1, 2016 1,166 $ 17.03 Granted 963 $ 14.41 Vested (472 ) $ 17.00 Forfeited (115 ) $ 15.73 Nonvested, December 31, 2016 1,542 $ 15.50 Granted 849 $ 16.43 Vested (646 ) $ 16.26 Forfeited (128 ) $ 15.71 Nonvested, December 31, 2017 1,617 $ 15.66 Granted 983 $ 8.66 Vested (596 ) $ 15.84 Forfeited (169 ) $ 14.83 Nonvested, December 31, 2018 1,835 $ 11.93 As of December 31, 2018, $17.6 2.8 not 401 Savings Plan In 1999, 401 may 15% no

Note 8 - Restructuring Charges

Note 8 - Restructuring Charges	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Restructuring and Related Activities Disclosure [Text Block]	8 . RESTRUCTURING CHARGES On September 27, 2018, October 24, 2018. In the fourth 2018, $576,000 December 31, 2018. Of the $576,000 $332,000 fourth 2018 $244,000 December 31, 2018 2019.

Note 9 - Income Taxes

Note 9 - Income Taxes	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Income Tax Disclosure [Text Block]	9. On December 22, 2017, 2017 one 35% 21% January 1, 2018, December 2017, No. 118, 118 not one fourth 2018, December 31, 2018. Effective January 1, 2018, 1 2 first 2018, The Company has not December 31, 2018. Year Ended December 31, 201 8 201 7 2016 (In thousands) U.S. Current $ (84 ) $ (141 ) $ 410 Deferred (4,171 ) (471 ) 208 Foreign Current 347 254 329 Withholding 2,165 1,654 2,898 Deferred — (33 ) 8 Total provision (benefit) $ (1,743 ) $ 1,263 $ 3,853 During the years ended December 31, 2018, 2017 2016, 11.1 1.2 $11.3 $1.6 $1.1 $1.6 The income tax provision (benefit) differs from the amount estimated by applying the statutory federal income tax rate ( 21% 2018, 35% 2017 2016 Year Ended December 31, 201 8 2017 201 6 Federal statutory tax provision $ (1,986 ) $ (26 ) $ 4,534 State tax provision (133 ) (110 ) 283 Stock compensation expense 768 (944 ) 45 Tax credits (2,682 ) (2,769 ) (4,000 ) Foreign tax, net 2,104 1,641 2,852 Tax law changes — 3,247 — Other 186 224 139 Tax provision (benefit) $ (1,743 ) $ 1,263 $ 3,853 As of December 31, 2018, $9.9 $5.9 2019 2028, As of December 31, 2018, $13.6 $17.7 2025, 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, 2018 2017, not” not not” December 31, 2018 2017, $9.7 $9.0 $0.1 not not December 31, 2018 2017 $18.3 $15.5 The components of the net deferred tax assets are comprised of (in thousands): December 31, 201 8 201 7 Deferred tax assets Net operating loss carry forward $ 2,720 $ 1,318 Research and development and other credit carry forward 17,750 16,626 Foreign tax credit carry forward 3,994 1,754 Accruals deductible in different periods 2,198 3,285 Intangible assets 1,081 1,325 Stock-based compensation 1,109 1,166 Valuation allowance (9,808 ) (9,126 ) Subtotal $ 19,044 $ 16,348 Deferred tax liabilities Fixed assets (710 ) (835 ) Net deferred tax assets $ 18,334 $ 15,513 In accordance with 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, 2018 2017, $0.8 $0.7 December 31, 2018, 2017, 2016, $84,000, $135,000, $72,000, The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of December 31, 2018 $13.3 $7.8 December 31, 2018, $3.0 $0.8 $10.3 $5.5 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, 2016 $ 10,979 Increases in tax positions for current year 1,118 Increase in tax positions for prior years 112 Lapse in statute of limitations (269 ) Gross unrecognized tax benefits, December 31, 2016 11,940 Increases in tax positions for current year 1,166 Increases in tax positions for prior years — Lapse in statute of limitations (217 ) Gross unrecognized tax benefits, December 31, 2017 12,889 Increases in tax positions for current year 664 Increases in tax positions for prior years — Lapse in statute of limitations (261 ) Gross unrecognized tax benefits, December 31, 2018 $ 13,292 We do not Valuation allowance for deferred tax assets is summarized: Balance at Beginning of Period Charged to Costs and Expenses Deductions/ Write-offs of Accounts Balance at End of Period Valuation allowance for deferred tax assets 2018 $ 9,126 $ 682 $ — $ 9,808 2017 $ 6,798 $ 2,328 $ — $ 9,126 2016 $ 6,205 $ 593 $ — $ 6,798

Note 10 - Net Income Per Share

Note 10 - Net Income Per Share	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Earnings Per Share [Text Block]	10 . NET INCOME (LOSS) PER SHARE Basic net income (loss) 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, 2018 2017 2016 Numerator: Net income (loss) $ (7,716 ) $ (1,337 ) $ 9,103 Denominator: Basic weighted-average shares outstanding 32,169 32,038 31,373 Effect of dilutive options and restricted stock — — 1,058 Diluted weighted-average shares outstanding 32,169 32,038 32,431 Net income (loss) per share – Basic $ (0.24 ) $ (0.04 ) $ 0.29 Net income (loss) per share – Diluted $ (0.24 ) $ (0.04 ) $ 0.28 For the years ended December 31, 2018 2017, The following table sets forth potential shares of common stock that are not Years Ended December 31, 2018 2017 2016 Outstanding options 669 751 134 Nonvested shares of restricted stock units 1,060 411 18 Employee Stock Purchase Plan 237 214 121 Total 1,966 1,376 273

Note 11 - Customer and Geograph

Note 11 - Customer and Geographic Information	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	11 . 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 2018 2017 2016 A 37 % 40 % 41 % B * * % 11 % * 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 2018 2017 A 35 % 41 % C 21 % 15 % Revenues from customers by geographic area based on the location of the customers’ work sites are as follows (in thousands): Year Ended December 31, 2018 2017 2016 Revenues Percentage of Revenues Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 34,179 40 % $ 39,631 39 % $ 38,748 36 % China 17,465 20 17,872 18 11,436 11 Taiwan 7,890 9 12,494 12 15,216 14 Germany 5,324 6 9,990 10 17,253 16 Rest of the world 20,936 25 21,884 21 24,808 23 Total revenue $ 85,794 100 % $ 101,871 100 % $ 107,461 100 % Long-lived assets, net by geographic area is as follows (in thousands): December 31, 201 8 201 7 United States $ 35,173 $ 24,883 Rest of the world 508 503 Total long-lived assets, net $ 35,681 $ 25,386

Note 12 - Financial Instruments

Note 12 - Financial Instruments	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Fair Value Disclosures [Text Block]	1 2 . 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, 2018, 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 $ 27,068 $ 27,068 $ — $ — 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 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 not not December 31, 2018, 2017, 2016, $0.7 $0.7 $0.4 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, 2018, one $8.2 $55,000

Note 13 - Selected Quarterly Fi

Note 13 - Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Quarterly Financial Information [Text Block]	1 3 . 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, 2018 2017. Year Ended December 31, 2018 Q1 Q2 Q3 Q4 (In thousands, except for per share amounts) Total revenues $ 24,737 $ 21,119 $ 20,213 $ 19,725 Gross profit $ 13,255 $ 10,202 $ 9,530 $ 10,004 Net loss $ (424 ) $ (2,096 ) $ (2,082 ) $ (3,114 ) Net loss per share: Basic $ (0.01 ) $ (0.07 ) $ (0.06 ) $ (0.10 ) Diluted $ (0.01 ) $ (0.07 ) $ (0.06 ) $ (0.10 ) Year Ended December 31, 2017 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 (loss) $ 517 $ 189 $ 590 $ (2,634 ) Net income (loss) per share: Basic $ 0.02 $ 0.01 $ 0.02 $ (0.08 ) Diluted $ 0.02 $ 0.01 $ 0.02 $ (0.08 )

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
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, 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, 2018, two 56% one 37% 2018. December 31, 2017, two 56% one 40% 2017. 11 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 (in years) of the related asset as follows: Computer equipment 3 Software 3 Furniture, fixtures, equipment and test equipment 3 - 10 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
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 December 31, 2018 2017. not 12 $5.3 $8.6 December 31, 2018 2017, Allowance for doubtful accounts are summarized below (in thousands): Balance at Beginning of Period Charged to Costs and Expenses Deductions/ Write-offs of Accounts Balance at End of Period Allowance for doubtful accounts 2018 $ 374 $ — $ 42 $ 332 2017 $ 200 $ 174 $ — $ 374 2016 $ 299 $ — $ 99 $ 200
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 consist primarily of personnel-related costs to support product development activities, including compensation and benefits, outside development services, travel, facilities cost allocations, and stock-based compensation charges. 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 The Company's provision for income tax comprises its current tax liability and change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities. The measurement of current and deferred tax assets and liabilities is based on provisions of enacted tax laws; the effect of future changes in tax laws or rates are not not No not not 50%
Earnings Per Share, Policy [Policy Text Block]	Net Income (Loss) Per Share Basic net income (loss) 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 (loss) per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. Dilutive potential common shares consist of incremental common shares issuable upon exercise of stock options, upon vesting of restricted stock units, contingently issuable shares for all periods and assumed issuance of shares under employee stock purchase plan. No
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 (loss).
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 forward 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, 2018, not no no
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Pronouncements In May 2014, No. 2014 09, 606 605 606, five first first 2018. 2 In August 2016, No. 2016 15, 230 December 15, 2017, January 1, 2018, not In November 2016, No. 2016 18, 230 December 15, 2017, January 1, 2018, not In January 2017, No. 2017 01, December 15, 2017. January 1, 2018, not In May 2017, No. 2017 09, 718 718. December 15, 2017. January 1, 2018, not In March 2018, No. 2018 05, 740 No. 118. December 22, 2017, 118 118 740 not one 118, December 31, 2017 first three 2018. December 31, 2018. 9, Recent Accounting Standards or Updates Not In February 2016, No. 2016 02, 842 December 15, 2018, July 2018, No. 2018 11 842 No. 2018 11 No. 2018 11, No. 2018 11 No. 2016 02 December 2018, No. 2018 20, 842 first 2019 No. 2018 11. In January 2017, No. 2017 04, 350 2 December 15, 2019, not In February 2018, No. 2018 02, 220 December 2017. December 15, 2018 not In August 2018, No. 2018 15, 350 40 first 2020. No. 2018 15 not

Note 1 - Description of Busin_2

Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Property Plant and Equipment Estimated Useful Lives [Table Text Block]	Computer equipment 3 Software 3 Furniture, fixtures, equipment and test equipment 3 - 10 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 2018 $ 374 $ — $ 42 $ 332 2017 $ 200 $ 174 $ — $ 374 2016 $ 299 $ — $ 99 $ 200

Note 2 - Revenue Recognition (T

Note 2 - Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	(In thousands) As reported under Topic 606 Adjustments Balances under Topic 605 Accounts receivable, net of allowance $ 51,570 $ (979 ) $ 50,591 Prepaid expenses and other current assets 9,562 (2,980 ) 6,582 Deferred tax assets 19,044 443 19,487 Other non-current assets 6,972 (34 ) 6,938 Deferred revenues – current portion 8,477 1,918 10,395 Long-term income taxes payable 3,751 (1,032 ) 2,719 Other non-current liabilities 2,831 787 3,618 Accumulated deficit (30,452 ) (5,223 ) (35,675 ) (In thousands) As reported under Topic 606 Adjustments Balances under Topic 605 Net loss $ (7,716 ) $ (870 ) $ (8,586 ) Adjustments to reconcile loss to net cash provided by operating activities: Deferred taxes (4,171 ) (127 ) (4,298 ) Changes in operating assets and liabilities: Accounts receivable 6,828 187 7,015 Prepaid expenses and other current assets (2,115 ) 588 (1,527 ) Other non-current assets 3,560 34 3,594 Deferred revenue 2,451 188 2,639 (In thousands) As reported under Topic 606 Adjustments Balances under Topic 605 Design-to-silicon-yield solutions $ 60,081 $ (711 ) $ 59,370 Gainshare performance incentives 25,713 (470 ) 25,243 Total revenue 85,794 (1,181 ) 84,613 Gross profit 42,991 (1,181 ) 41,810 Selling, general and administrative 23,934 (75 ) 23,859 Total operating expenses 52,943 (75 ) 52,868 Loss from operations (9,952 ) (1,106 ) (11,058 ) Loss before taxes (9,459 ) (1,106 ) (10,565 ) Income tax benefit (1,743 ) (235 ) (1,978 ) Net loss $ (7,716 ) $ (870 ) $ (8,586 )
Disaggregation of Revenue [Table Text Block]	Year Ended December 31, 2018 Licenses and Gainshare Performance Incentives $ 31,336 Support and services 53,486 Other 972 Total $ 85,794

Note 3 - Property and Equipme_2

Note 3 - Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Property, Plant and Equipment [Table Text Block]	December 31, 2018 2017 Computer equipment $ 10,536 $ 10,729 Software 4,112 3,348 Furniture, fixtures, and equipment 4,688 3,676 Leasehold improvements 5,474 1,980 Test equipment 14,697 13,796 Construction-in-progress 20,293 12,527 59,800 46,056 Less: accumulated depreciation and amortization (24,119 ) (20,670 ) Total $ 35,681 $ 25,386

Note 4 - Goodwill and Intangi_2

Note 4 - Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Finite-Lived Intangible Assets [Table Text Block]	December 31, 2018 December 31, 2017 Amortization Gross Net Gross Net Period Carrying Accumulated Carrying Carrying Accumulated Carrying (Dollars in thousands) (Years) Amount Amortization Amount Amount Amortization Amount Customer relationships 1 - 9 $ 6,740 $ (4,514 ) $ 2,226 $ 6,740 $ (4,145 ) $ 2,595 Developed technology 4 - 9 15,820 (13,404 ) 2,416 15,820 (12,829 ) 2,991 Tradename 2 - 7 790 (648 ) 142 790 (622 ) 168 Patent 7 - 10 1,800 (1,520 ) 280 1,800 (1,480 ) 320 Total $ 25,150 $ (20,086 ) $ 5,064 $ 25,150 $ (19,076 ) $ 6,074
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year Ending December 31, 2019 $ 1,009 2020 1,009 2021 833 2022 626 2023 626 2024 and thereafter 961 Total future amortization expense $ 5,064

Note 5 - Commitments and Cont_2

Note 5 - Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Year Ending December 31, 2019 $ 1,677 2020 1,811 2021 1,653 2022 1,484 2023 1,127 2024 and thereafter 3,673 Total future minimum lease payments $ 11,425

Note 7 - Employee Benefit Pla_2

Note 7 - Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Stock Plans Employee Stock 2018 2017 2016 2018 2017 2016 Expected life (in years) 4.43 4.42 4.40 1.25 1.25 1.25 Volatility 43.91 % 41.5 % 43.2 % 42.85 % 40.63 % 44.0 % Risk-free interest rate 2.73 % 1.81 % 1.34 % 2.48 % 1.25 % 0.50 % Expected dividend — — — — — —
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	Years Ended December 31, 2018 2017 2016 Costs of Design-to-silicon-yield solutions $ 3,554 $ 4,606 $ 4,427 Research and development 3,260 3,518 3,087 Selling, general and administrative 3,481 3,686 3,488 Stock-based compensation expenses $ 10,295 $ 11,810 $ 11,002
Share-based Compensation, Stock Options, Activity [Table Text Block]	Outstanding Options Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding, January 1, 2016 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, 2016 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, 2017 1,045 $ 9.65 Granted (weighted average fair value of $4.08 per share) 116 $ 10.35 Exercised (81 ) $ 6.93 Canceled (30 ) $ 13.41 Expired (23 ) $ 13.16 Outstanding, December 31, 2018 1,027 $ 9.75 4.35 $ 1,121 Vested and expected to vest, December 31, 2018 1,006 $ 9.68 4.25 $ 1,121 Exercisable, December 31, 2018 796 $ 8.69 3.05 $ 1,121
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	Shares Fair Value Nonvested, January 1, 2016 1,166 $ 17.03 Granted 963 $ 14.41 Vested (472 ) $ 17.00 Forfeited (115 ) $ 15.73 Nonvested, December 31, 2016 1,542 $ 15.50 Granted 849 $ 16.43 Vested (646 ) $ 16.26 Forfeited (128 ) $ 15.71 Nonvested, December 31, 2017 1,617 $ 15.66 Granted 983 $ 8.66 Vested (596 ) $ 15.84 Forfeited (169 ) $ 14.83 Nonvested, December 31, 2018 1,835 $ 11.93

Note 9 - Income Taxes (Tables)

Note 9 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Year Ended December 31, 201 8 201 7 2016 (In thousands) U.S. Current $ (84 ) $ (141 ) $ 410 Deferred (4,171 ) (471 ) 208 Foreign Current 347 254 329 Withholding 2,165 1,654 2,898 Deferred — (33 ) 8 Total provision (benefit) $ (1,743 ) $ 1,263 $ 3,853
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended December 31, 201 8 2017 201 6 Federal statutory tax provision $ (1,986 ) $ (26 ) $ 4,534 State tax provision (133 ) (110 ) 283 Stock compensation expense 768 (944 ) 45 Tax credits (2,682 ) (2,769 ) (4,000 ) Foreign tax, net 2,104 1,641 2,852 Tax law changes — 3,247 — Other 186 224 139 Tax provision (benefit) $ (1,743 ) $ 1,263 $ 3,853
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, 201 8 201 7 Deferred tax assets Net operating loss carry forward $ 2,720 $ 1,318 Research and development and other credit carry forward 17,750 16,626 Foreign tax credit carry forward 3,994 1,754 Accruals deductible in different periods 2,198 3,285 Intangible assets 1,081 1,325 Stock-based compensation 1,109 1,166 Valuation allowance (9,808 ) (9,126 ) Subtotal $ 19,044 $ 16,348 Deferred tax liabilities Fixed assets (710 ) (835 ) Net deferred tax assets $ 18,334 $ 15,513
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	Amount Gross unrecognized tax benefits, January 1, 2016 $ 10,979 Increases in tax positions for current year 1,118 Increase in tax positions for prior years 112 Lapse in statute of limitations (269 ) Gross unrecognized tax benefits, December 31, 2016 11,940 Increases in tax positions for current year 1,166 Increases in tax positions for prior years — Lapse in statute of limitations (217 ) Gross unrecognized tax benefits, December 31, 2017 12,889 Increases in tax positions for current year 664 Increases in tax positions for prior years — Lapse in statute of limitations (261 ) Gross unrecognized tax benefits, December 31, 2018 $ 13,292
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Notes Tables
Summary of Valuation Allowance [Table Text Block]	Balance at Beginning of Period Charged to Costs and Expenses Deductions/ Write-offs of Accounts Balance at End of Period Valuation allowance for deferred tax assets 2018 $ 9,126 $ 682 $ — $ 9,808 2017 $ 6,798 $ 2,328 $ — $ 9,126 2016 $ 6,205 $ 593 $ — $ 6,798

Note 10 - Net Income Per Share

Note 10 - Net Income Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Year Ended December 31, 2018 2017 2016 Numerator: Net income (loss) $ (7,716 ) $ (1,337 ) $ 9,103 Denominator: Basic weighted-average shares outstanding 32,169 32,038 31,373 Effect of dilutive options and restricted stock — — 1,058 Diluted weighted-average shares outstanding 32,169 32,038 32,431 Net income (loss) per share – Basic $ (0.24 ) $ (0.04 ) $ 0.29 Net income (loss) per share – Diluted $ (0.24 ) $ (0.04 ) $ 0.28
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Years Ended December 31, 2018 2017 2016 Outstanding options 669 751 134 Nonvested shares of restricted stock units 1,060 411 18 Employee Stock Purchase Plan 237 214 121 Total 1,966 1,376 273

Note 11 - Customer and Geogra_2

Note 11 - Customer and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	Year Ended December 31, Customer 2018 2017 2016 A 37 % 40 % 41 % B * * % 11 %
Receivables by Major Customers [Table Text Block]	December 31, Customer 2018 2017 A 35 % 41 % C 21 % 15 %
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	Year Ended December 31, 2018 2017 2016 Revenues Percentage of Revenues Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 34,179 40 % $ 39,631 39 % $ 38,748 36 % China 17,465 20 17,872 18 11,436 11 Taiwan 7,890 9 12,494 12 15,216 14 Germany 5,324 6 9,990 10 17,253 16 Rest of the world 20,936 25 21,884 21 24,808 23 Total revenue $ 85,794 100 % $ 101,871 100 % $ 107,461 100 %
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	December 31, 201 8 201 7 United States $ 35,173 $ 24,883 Rest of the world 508 503 Total long-lived assets, net $ 35,681 $ 25,386

Note 12 - Financial Instrumen_2

Note 12 - Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
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 $ 27,068 $ 27,068 $ — $ — 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 $ — $ —

Note 13 - Selected Quarterly _2

Note 13 - Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Quarterly Financial Information [Table Text Block]	Year Ended December 31, 2018 Q1 Q2 Q3 Q4 (In thousands, except for per share amounts) Total revenues $ 24,737 $ 21,119 $ 20,213 $ 19,725 Gross profit $ 13,255 $ 10,202 $ 9,530 $ 10,004 Net loss $ (424 ) $ (2,096 ) $ (2,082 ) $ (3,114 ) Net loss per share: Basic $ (0.01 ) $ (0.07 ) $ (0.06 ) $ (0.10 ) Diluted $ (0.01 ) $ (0.07 ) $ (0.06 ) $ (0.10 ) Year Ended December 31, 2017 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 (loss) $ 517 $ 189 $ 590 $ (2,634 ) Net income (loss) per share: Basic $ 0.02 $ 0.01 $ 0.02 $ (0.08 ) Diluted $ 0.02 $ 0.01 $ 0.02 $ (0.08 )

Note 1 - Description of Busin_3

Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Number of Reporting Units	1
Goodwill, Impairment Loss	$ 0	$ 0
Unbilled Receivables, Current	22,200	22,200
Contract with Customer, Asset, Unbilled Receivables, Not Billable, Amount Expected to be Collected after Next Twelve Months	$ 5,300	$ 8,600
Capitalized Computer Software, Useful Life	6 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Loss Contingency Accrual, Ending Balance	$ 0
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]
Concentration Risk, Percentage	56.00%	56.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | One Customer [Member]
Concentration Risk, Percentage	37.00%	40.00%

Note 1 - Description of Busin_4

Note 1 - Description of Business and Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2018
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)	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, plant and equipment, useful life (Year)	10 years
Leasehold Improvements [Member]
Property, plant and equipment, useful life	Shorter of estimated useful life or term of lease

Note 1 - Description of Busin_5

Note 1 - Description of Business and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance at Beginning of Period	$ 374	$ 200	$ 299
Charged to Costs and Expenses		174
Deductions/ Write-offs of Accounts	42		99
Balance at End of Period	$ 332	$ 374	$ 200

Note 2 - Revenue Recognition (D

Note 2 - Revenue Recognition (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Retained Earnings (Accumulated Deficit), Ending Balance	$ (30,452)	$ (27,089)
Capitalized Contract Cost, Net, Total	500			$ 500
Revenue from Contract with Customer, Including Assessed Tax	85,794	101,871	$ 107,461
Contract with Customer, Liability, Noncurrent	1,000			900
Contract with Customer, Liability, Revenue Recognized	6,300
Revenue, Remaining Performance Obligation, Amount	47,100
Contract with Customer, Performance Obligation Satisfied in Previous Period	1,800
Capitalized Contract Cost, Amortization	400
Capitalized Contract Cost, Impairment Loss	0
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Asset, Net, Current, Total	2,700			1,900
Prepaid Expenses and Other Current Assets and Other Non-current Assets [Member]
Deferred Costs, Total	200	600
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 85,794	$ 101,871	$ 107,461
Concentration Risk, Percentage	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Countries other than the United States [Member]
Concentration Risk, Percentage	60.00%	61.00%	64.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Transferred over Time [Member]
Concentration Risk, Percentage	63.00%	37.00%
Accounting Standards Update 2014-09 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance				(4,400)
Accounts Receivable, Net, Total				800
Contract with Customer, Asset, Net, Total				1,900
Contract with Customer, Liability, Total				$ (2,500)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance	$ (5,223)
Revenue from Contract with Customer, Including Assessed Tax	$ (1,181)

Note 2 - Revenue Recognition -

Note 2 - Revenue Recognition - Adoption of ASC 606 (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Accounts receivable, net of allowance	$ 51,570				$ 57,564				$ 51,570	$ 57,564
Prepaid expenses and other current assets	9,562				5,069				9,562	5,069
Deferred tax assets	19,044				16,348				19,044	16,348
Other non-current assets	6,972				10,545				6,972	10,545
Deferred revenues – current portion	8,477				7,981				8,477	7,981
Long-term income taxes payable	3,751				3,902				3,751	3,902
Other non-current liabilities	2,831				2,269				2,831	2,269
Accumulated deficit	(30,452)				(27,089)				(30,452)	(27,089)
Net loss	(3,114)	$ (2,082)	$ (2,096)	$ (424)	(2,634)	$ 590	$ 189	$ 517	(7,716)	(1,337)	$ 9,103
Deferred taxes									(4,171)	(504)	216
Accounts receivable									6,828	(9,581)	(14,620)
Prepaid expenses and other current assets									(2,115)	373	(1,688)
Other non-current assets									3,560	2,103	(10,988)
Deferred revenue									2,451	(326)	4,772
Revenues									85,794	101,871	107,461
Gross profit	10,004	$ 9,530	$ 10,202	$ 13,255	$ 14,495	$ 14,086	$ 12,910	$ 12,858	42,991	54,350	63,013
Selling, general and administrative									23,934	23,684	22,056
Total operating expenses									52,943	54,160	50,047
Loss from operations									(9,952)	190	12,966
Loss before taxes									(9,459)	(74)	12,956
Income tax benefit									(1,743)	1,263	3,853
Accounting Standards Update 2014-09 [Member]
Accumulated deficit												$ (4,400)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Accounts receivable, net of allowance	(979)								(979)
Prepaid expenses and other current assets	(2,980)								(2,980)
Deferred tax assets	443								443
Other non-current assets	(34)								(34)
Deferred revenues – current portion	1,918								1,918
Long-term income taxes payable	(1,032)								(1,032)
Other non-current liabilities	787								787
Accumulated deficit	(5,223)								(5,223)
Net loss									(870)
Deferred taxes									(127)
Accounts receivable									187
Prepaid expenses and other current assets									588
Other non-current assets									34
Deferred revenue									188
Revenues									(1,181)
Gross profit									(1,181)
Selling, general and administrative									(75)
Total operating expenses									(75)
Loss from operations									(1,106)
Loss before taxes									(1,106)
Income tax benefit									(235)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Accounts receivable, net of allowance	50,591								50,591
Prepaid expenses and other current assets	6,582								6,582
Deferred tax assets	19,487								19,487
Other non-current assets	6,938								6,938
Deferred revenues – current portion	10,395								10,395
Long-term income taxes payable	2,719								2,719
Other non-current liabilities	3,618								3,618
Accumulated deficit	$ (35,675)								(35,675)
Net loss									(8,586)
Deferred taxes									(4,298)
Accounts receivable									7,015
Prepaid expenses and other current assets									(1,527)
Other non-current assets									3,594
Deferred revenue									2,639
Revenues									84,613
Gross profit									41,810
Selling, general and administrative									23,859
Total operating expenses									52,868
Loss from operations									(11,058)
Loss before taxes									(10,565)
Income tax benefit									(1,978)
License and Service [Member]
Revenues									60,081	74,436	77,162
License and Service [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenues									(711)
License and Service [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenues									59,370
Gainshare Performance Incentives [Member]
Revenues									25,713	$ 27,435	$ 30,299
Gainshare Performance Incentives [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenues									(470)
Gainshare Performance Incentives [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenues									$ 25,243

Note 2 - Revenue Recognition _2

Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues	$ 85,794	$ 101,871	$ 107,461
License [Member]
Revenues	31,336
Service [Member]
Revenues	53,486
Product and Service, Other [Member]
Revenues	$ 972

Note 3 - Property and Equipme_3

Note 3 - Property and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Depreciation, Depletion and Amortization, Nonproduction, Total	$ 5	$ 4.8	$ 3.6
DFI Test Equipment [Member]
Construction in Progress, Gross	$ 17.4	$ 10.9

Note 3 - Property and Equipme_4

Note 3 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property and equipment, gross	$ 59,800	$ 46,056
Less: accumulated depreciation and amortization	(24,119)	(20,670)
Total	35,681	25,386
Computer Equipment [Member]
Property and equipment, gross	10,536	10,729
Software and Software Development Costs [Member]
Property and equipment, gross	4,112	3,348
Furniture and Fixtures [Member]
Property and equipment, gross	4,688	3,676
Leasehold Improvements [Member]
Property and equipment, gross	5,474	1,980
Test Equipment [Member]
Property and equipment, gross	14,697	13,796
Construction in Progress [Member]
Property and equipment, gross	$ 20,293	$ 12,527

Note 4 - Goodwill and Intangi_3

Note 4 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill, Ending Balance	$ 1,923	$ 1,923
Finite-Lived Intangible Assets, Net, Ending Balance	$ 5,064	6,074
Finite-Lived Intangible Assets, Remaining Amortization Period	5 years 328 days
Amortization of Intangible Assets, Total	$ 1,010	$ 869	$ 805
Impairment of Intangible Assets, Finite-lived	$ 0

Note 4 - Goodwill and Intangi_4

Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Gross Carrying Amount	$ 25,150	$ 25,150
Accumulated Amortization	(20,086)	(19,076)
Intangible assets, net	5,064	6,074
Customer Relationships [Member]
Gross Carrying Amount	6,740	6,740
Accumulated Amortization	(4,514)	(4,145)
Intangible assets, net	$ 2,226	2,595
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	15,820
Accumulated Amortization	(13,404)	(12,829)
Intangible assets, net	$ 2,416	2,991
Developed Technology Rights [Member] | Minimum [Member]
Amortization Period (Year)	4 years
Developed Technology Rights [Member] | Maximum [Member]
Amortization Period (Year)	9 years
Trade Names [Member]
Gross Carrying Amount	$ 790	790
Accumulated Amortization	(648)	(622)
Intangible assets, net	$ 142	168
Trade Names [Member] | Minimum [Member]
Amortization Period (Year)	2 years
Trade Names [Member] | Maximum [Member]
Amortization Period (Year)	7 years
Patents [Member]
Gross Carrying Amount	$ 1,800	1,800
Accumulated Amortization	(1,520)	(1,480)
Intangible assets, net	$ 280	$ 320
Patents [Member] | Minimum [Member]
Amortization Period (Year)	7 years
Patents [Member] | Maximum [Member]
Amortization Period (Year)	10 years

Note 4 - Goodwill and Intangi_5

Note 4 - Goodwill and Intangible Assets - Annual Amortization of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
2,019	$ 1,009
2,020	1,009
2,021	833
2,022	626
2,023	626
2024 and thereafter	961
Total future amortization expense	$ 5,064	$ 6,074

Note 5 - Commitments and Cont_3

Note 5 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Rent Expense, Net, Total	$ 2,500	$ 2,300	$ 2,200
Purchase Obligation, Due in Next Twelve Months	8,700
Loss Contingency Accrual, Ending Balance	$ 0

Note 5 - Commitments and Cont_4

Note 5 - Commitments and Contingencies - Future Minimum Lease Payments Under Noncancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
2,019	$ 1,677
2,020	1,811
2,021	1,653
2,022	1,484
2,023	1,127
2024 and thereafter	3,673
Total future minimum lease payments	$ 11,425

Note 6 - Stockholders' Equity (

Note 6 - Stockholders' Equity (Details Textual) - USD ($)	May 29, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Oct. 25, 2016
Treasury Stock, Value, Acquired, Cost Method		$ 5,248,000	$ 13,418,000	$ 2,182,000
The 2016 Stock Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount						$ 25
Treasury Stock, Shares, Acquired		437,000			1,279,000
Treasury Stock, Value, Acquired, Cost Method		$ 5,200,000			$ 18,700,000
Treasury Stock Acquired, Average Cost Per Share					$ 14.59
The 2018 Stock Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount	$ 25,000,000
Stock Repurchase Program, Period in Force	2 years
Treasury Stock, Shares, Acquired		0
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 25,000,000			$ 25,000,000

Note 7 - Employee Benefit Pla_3

Note 7 - Employee Benefit Plans (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Jul. 31, 2001	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Nov. 16, 2011	Dec. 31, 2001
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		30,000	25,000	31,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance		1,027,000	1,045,000	1,364,000	1,764,000
Allocated Share-based Compensation Expense, Total		$ 10,295,000	$ 11,810,000	$ 11,002,000
Share Price		$ 8.43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 400,000	5,300,000	4,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		$ 400,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent		15.00%
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		3 years 21 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total		$ 1,000,000
Stock Appreciation Rights (SARs) [Member]
Allocated Share-based Compensation Expense, Total		$ (24,000)	$ (30,000)	$ 116,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 8.66	$ 16.43	$ 14.41
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years 292 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total		$ 17,600,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
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%
Common Stock, Capital Shares Reserved for Future Issuance		8,734,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans		201,000	200,000	173,000
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased		$ 9.12	$ 9.33	$ 9
Number Of ESPP Shares Available For Future Issuance		4,738,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 3.62	$ 5.22	$ 3.69
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		$ 1,500,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		1 year 211 days
Twenty Eleven Stock Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance		9,600,000
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
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		3,000,000
Twenty Eleven Stock Incentive Plan [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Shares Previously Issued Under the 2001 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							3,500,000
IDS Plan [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Two Thousand One Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period		500,000
Outside of the 2011, 2001 or IDS Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance		0

Note 7 - Employee Benefit Pla_4

Note 7 - Employee Benefit Plans - Stock Options, Valuation Assumptions (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Plans [Member]
Expected life (Year)	4 years 156 days	4 years 153 days	4 years 146 days
Volatility	43.91%	41.50%	43.20%
Risk-free interest rate	2.73%	1.81%	1.34%
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	42.85%	40.63%	44.00%
Risk-free interest rate	2.48%	1.25%	0.50%
Expected dividend	0.00%	0.00%	0.00%

Note 7 - Employee Benefit Pla_5

Note 7 - Employee Benefit Plans - Allocation of Recognized Period Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allocation of recognized period costs	$ 10,295	$ 11,810	$ 11,002
Cost of Sales [Member]
Allocation of recognized period costs	3,554	4,606	4,427
Research and Development Expense [Member]
Allocation of recognized period costs	3,260	3,518	3,087
Selling, General and Administrative Expenses [Member]
Allocation of recognized period costs	$ 3,481	$ 3,686	$ 3,488

Note 7 - Employee Benefits Plan

Note 7 - Employee Benefits Plans - Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Outstanding (in shares)	1,045	1,364	1,764
Outstanding, weighted average exercise price (in dollars per share)	$ 9.65	$ 8	$ 7.88
Granted (in shares)	116	150	99
Granted, weighted average exercise price (in dollars per share)	$ 10.35	$ 16.28	$ 14.55
Exercised (in shares)	(81)	(440)	(393)
Exercised, weighted average exercise price (in dollars per share)	$ 6.93	$ 6.42	$ 7.56
Canceled (in shares)	(30)	(25)	(31)
Canceled, weighted average exercise price (in dollars per share)	$ 13.41	$ 15.03	$ 13.82
Expired (in shares)	(23)	(4)	(75)
Expired, weighted average exercise price (in dollars per share)	$ 13.16	$ 16.46	$ 13.80
Outstanding (in shares)	1,027	1,045	1,364
Outstanding, weighted average exercise price (in dollars per share)	$ 9.75	$ 9.65	$ 8
Outstanding, weighted average remaining contractual term (Year)	4 years 127 days
Outstanding, aggregate intrinsic value	$ 1,121
Vested and expected to vest, December 31, 2018 (in shares)	1,006
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 9.68
Vested and expected to vest, weighted average remaining contractual term (Year)	4 years 91 days
Vested and expected to vest, aggregate intrinsic value	$ 1,121
Exercisable, December 31, 2018 (in shares)	796
Exercisable, weighted average exercise price (in dollars per share)	$ 8.69
Exercisable, weighted average remaining contractual term (Year)	3 years 18 days
Exercisable, aggregate intrinsic value	$ 1,121

Note 7 - Employee Benefits Pl_2

Note 7 - Employee Benefits Plans - Stock Options Activity (Details) (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted average fair value (in dollars per share)	$ 4.08	$ 5.92	$ 5.36

Note 7 - Employee Benefit Pla_6

Note 7 - Employee Benefit Plans - Nonvested Restricted Stock Units Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Nonvested, Balance (in shares)	1,835
Nonvested, Balance (in dollars per share)	$ 11.93
Restricted Stock Units (RSUs) [Member]
Nonvested, Balance (in shares)	1,617	1,542	1,166
Nonvested, Balance (in dollars per share)	$ 15.66	$ 15.50	$ 17.03
Granted (in shares)	983	849	963
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 8.66	$ 16.43	$ 14.41
Vested (in shares)	(596)	(646)	(472)
Vested (in dollars per share)	$ 15.84	$ 16.26	$ 17
Forfeited (in shares)	(169)	(128)	(115)
Forfeited (in dollars per share)	$ 14.83	$ 15.71	$ 15.73
Granted (in dollars per share)	8.66	16.43	14.41
Vested (in dollars per share)	15.84	16.26	17
Forfeited (in dollars per share)	$ 14.83	$ 15.71	$ 15.73
Nonvested, Balance (in shares)		1,617	1,542
Nonvested, Balance (in dollars per share)		$ 15.66	$ 15.50

Note 8 - Restructuring Charges

Note 8 - Restructuring Charges (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Charges, Total			$ 576,000
Employee Severance [Member] | Reduction in Its Workforce to Reduce Expenses [Member]
Restructuring Charges, Total	$ 576,000
Payments for Restructuring	$ 332,000
Employee Severance [Member] | Reduction in Its Workforce to Reduce Expenses [Member] | Scenario, Forecast [Member]
Payments for Restructuring		$ 244,000

Note 9 - Income Taxes (Details

Note 9 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%		35.00%
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ (11,100,000)	$ (1,200,000)	$ 11,300,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	1,600,000	1,100,000	1,600,000
Deferred Tax Assets, Valuation Allowance, Total	9,808,000	9,126,000
Deferred Tax Assets, Net, Total	18,334,000	15,513,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	800,000	700,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	84,000	135,000	72,000
Unrecognized Tax Benefits, Ending Balance	13,292,000	12,889,000	$ 11,940,000	$ 10,979,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	7,800,000
Unrecognized Tax Benefits In Long Term Liabilities	3,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued in Long Term Liabilities	800,000
Unrecognized Tax Benefits In Deferred Tax Assets	10,300,000
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	5,500,000
Domestic Tax Authority [Member]
Tax Credit Carryforward, Amount	13,600,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total	9,900,000
State and Local Jurisdiction [Member]
Tax Credit Carryforward, Amount	17,700,000
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforwards, Total	5,900,000
Deferred Tax Assets, Valuation Allowance, Total	9,700,000	$ 9,000,000
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] | Syntricity [Member]
Operating Loss Carryforwards, Total	$ 100,000

Note 9 - Income Taxes - Income

Note 9 - Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S.
Current	$ (84)	$ (141)	$ 410
Deferred	(4,171)	(471)	208
Foreign
Current	347	254	329
Withholding	2,165	1,654	2,898
Deferred		(33)	8
Tax provision (benefit)	$ (1,743)	$ 1,263	$ 3,853

Note 9 - Income Taxes - Incom_2

Note 9 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal statutory tax provision		$ (1,986)	$ (26)	$ 4,534
State tax provision		(133)	(110)	283
Stock compensation expense	[1]	768	(944)	45
Tax credits		(2,682)	(2,769)	(4,000)
Foreign tax, net		2,104	1,641	2,852
Tax law changes			3,247
Other		186	224	139
Tax provision (benefit)		$ (1,743)	$ 1,263	$ 3,853
[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 9 - Income Taxes - Deferre

Note 9 - Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Net operating loss carry forward	$ 2,720	$ 1,318
Research and development and other credit carry forward	17,750	16,626
Foreign tax credit carry forward	3,994	1,754
Accruals deductible in different periods	2,198	3,285
Intangible assets	1,081	1,325
Stock-based compensation	1,109	1,166
Valuation allowance	(9,808)	(9,126)
Subtotal	19,044	16,348
Deferred tax liabilities
Fixed assets	(710)	(835)
Net deferred tax assets	$ 18,334	$ 15,513

Note 9 - Income Taxes - Unrecog

Note 9 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Gross unrecognized tax benefits	$ 12,889	$ 11,940	$ 10,979
Increases in tax positions for current year	664	1,166	1,118
Increase in tax positions for prior years			112
Lapse in statute of limitations	(261)	(217)	(269)
Gross unrecognized tax benefits	$ 13,292	$ 12,889	$ 11,940

Note 9 - Income Taxes - Valuati

Note 9 - Income Taxes - Valuation Allowance of Deferred Tax Assets (Details) - SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Balance at Beginning of Period	$ 9,126	$ 6,798	$ 6,205
Charged to Costs and Expenses	682	2,328	593
Deductions/ Write-offs of Accounts
Balance at End of Period	$ 9,126	$ 6,798	$ 6,205	$ 9,808

Note 10 - Net Income Per Shar_2

Note 10 - Net Income 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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income (loss)	$ (3,114)	$ (2,082)	$ (2,096)	$ (424)	$ (2,634)	$ 590	$ 189	$ 517	$ (7,716)	$ (1,337)	$ 9,103
Basic weighted-average shares outstanding (in shares)									32,169	32,038	31,373
Effect of dilutive options and restricted stock (in shares)											1,058
Diluted weighted-average shares outstanding (in shares)									32,169	32,038	32,431
Net income (loss) per share – Basic (in dollars per share)	$ (0.10)	$ (0.06)	$ (0.07)	$ (0.01)	$ (0.08)	$ 0.02	$ 0.01	$ 0.02	$ (0.24)	$ (0.04)	$ 0.29
Net income (loss) per share – Diluted (in dollars per share)	$ (0.10)	$ (0.06)	$ (0.07)	$ (0.01)	$ (0.08)	$ 0.02	$ 0.01	$ 0.02	$ (0.24)	$ (0.04)	$ 0.28

Note 10 - Net Income Per Shar_3

Note 10 - Net Income Per Share - Anti-dilutive Securities (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Anti-dilutive securities (in shares)	1,966	1,376	273
Employee Stock Option [Member]
Anti-dilutive securities (in shares)	669	751	134
Restricted Stock Units (RSUs) [Member]
Anti-dilutive securities (in shares)	1,060	411	18
Employee Stock Purchase Plan [Member]
Anti-dilutive securities (in shares)	237	214	121

Note 11 - Customer and Geogra_3

Note 11 - Customer and Geographic Information (Details Textual)	9 Months Ended
	Sep. 30, 2018
Number of Operating Segments	1

Note 11 - Customer and Geogra_4

Note 11 - Customer and Geographic Information - Revenue Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Sales Revenue, Net [Member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Customer A [Member]
Revenue Percentage by Major Customer	37.00%	40.00%	41.00%
Customer B [Member]
Revenue Percentage by Major Customer			11.00%

Note 11 - Customer and Geogra_5

Note 11 - Customer and Geographic Information - Receivables Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Accounts Receivable [Member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Customer A [Member]
Revenue Percentage by Major Customer	35.00%	41.00%
Customer C [Member]
Revenue Percentage by Major Customer	21.00%	15.00%

Note 11 - Customer and Geogra_6

Note 11 - Customer and Geographic Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from Contract with Customer, Including Assessed Tax	$ 85,794	$ 101,871	$ 107,461
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 85,794	$ 101,871	$ 107,461
Concentration Risk, Percentage	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	$ 34,179	$ 39,631	$ 38,748
Concentration Risk, Percentage	40.00%	39.00%	36.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | CHINA
Revenue from Contract with Customer, Including Assessed Tax	$ 17,465	$ 17,872	$ 11,436
Concentration Risk, Percentage	20.00%	18.00%	11.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | TAIWAN, PROVINCE OF CHINA
Revenue from Contract with Customer, Including Assessed Tax	$ 7,890	$ 12,494	$ 15,216
Concentration Risk, Percentage	9.00%	12.00%	14.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | GERMANY
Revenue from Contract with Customer, Including Assessed Tax	$ 5,324	$ 9,990	$ 17,253
Concentration Risk, Percentage	6.00%	10.00%	16.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Rest of the World [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 20,936	$ 21,884	$ 24,808
Concentration Risk, Percentage	25.00%	21.00%	23.00%

Note 11 - Customer and Geogra_7

Note 11 - Customer and Geographic Information - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Long-lived assets	$ 35,681	$ 25,386
UNITED STATES
Long-lived assets	35,173	24,883
Rest of the World [Member]
Long-lived assets	$ 508	$ 503

Note 12 - Financial Instrumen_3

Note 12 - Financial Instruments (Details Textual) - Foreign Exchange Contract [Member] - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Asset, Notional Amount	$ 8,200,000
Other Current Assets [Member]
Derivative Asset, Current	55,000
Other Nonoperating Income (Expense) [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	$ (700,000)	$ 700,000	$ (400,000)

Note 12 - Financial Instrumen_4

Note 12 - Financial Instruments - Fair Value, Assets Measured on a Recurring Basis (Details) - Money Market Funds [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Money market mutual funds	$ 27,068	$ 26,638
Fair Value, Inputs, Level 1 [Member]
Money market mutual funds	27,068	26,638
Fair Value, Inputs, Level 2 [Member]
Money market mutual funds
Fair Value, Inputs, Level 3 [Member]
Money market mutual funds

Note 13 - Selected Quarterly _3

Note 13 - 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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Total revenues	$ 19,725	$ 20,213	$ 21,119	$ 24,737	$ 26,776	$ 26,517	$ 24,289	$ 24,289
Gross profit	10,004	9,530	10,202	13,255	14,495	14,086	12,910	12,858	$ 42,991	$ 54,350	$ 63,013
Net income (loss)	$ (3,114)	$ (2,082)	$ (2,096)	$ (424)	$ (2,634)	$ 590	$ 189	$ 517	$ (7,716)	$ (1,337)	$ 9,103
Basic (in dollars per share)	$ (0.10)	$ (0.06)	$ (0.07)	$ (0.01)	$ (0.08)	$ 0.02	$ 0.01	$ 0.02	$ (0.24)	$ (0.04)	$ 0.29
Diluted (in dollars per share)	$ (0.10)	$ (0.06)	$ (0.07)	$ (0.01)	$ (0.08)	$ 0.02	$ 0.01	$ 0.02	$ (0.24)	$ (0.04)	$ 0.28