Sigma Designs (SIGM) 10-K 30 Mar 17 2017 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Jan. 28, 2017	Mar. 15, 2017	Jul. 30, 2016
Document Information [Line Items]
Entity Registrant Name	SIGMA DESIGNS INC
Entity Central Index Key	790,715
Trading Symbol	sigm
Current Fiscal Year End Date	--01-28
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		38,153,106
Entity Public Float			$ 244,010,322
Document Type	10-K
Document Period End Date	Jan. 28, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Current assets
Cash and cash equivalents	$ 66,425	$ 63,790
Short-term marketable securities	4,781	4,805
Restricted cash	303	900
Accounts receivable, net of allowances of $1,630 as of January 28, 2017 and $2,002 as of January 30, 2016	35,860	30,362
Inventory	18,147	26,709
Prepaid expenses and other current assets	8,017	14,085
Total current assets	133,533	140,651
Long-term marketable securities		3,527
Software, equipment and leasehold improvements, net	18,523	14,086
Intangible assets, net	30,744	37,050
Goodwill	10,594	11,068
Deferred tax assets	625	911
Long-term investments	2,000	2,884
Other non-current assets	5,755	6,492
Total assets	201,774	216,669
Current liabilities
Accounts payable	14,230	26,181
Accrued compensation and related benefits	8,127	7,360
Accrued liabilities	13,607	14,632
Total current liabilities	35,964	48,173
Income taxes payable	15,752	11,351
Deferred tax liabilities	287	317
Other long-term liabilities	6,225	4,023
Total liabilities	58,228	63,864
Commitments and contingencies (Note 10)
Shareholders’ equity
Preferred stock; no par value, 2,000,000 shares authorized; none issued and outstanding
Common stock and additional paid-in capital; no par value; 100,000,000 shares authorized; 42,806,279 issued and 38,130,530 outstanding as of January 28, 2017 and 41,424,377 issued and 36,748,628 outstanding as of January 30, 2016	513,168	503,809
Treasury stock, at cost, 4,675,749 shares as of January 28, 2017 and January 30, 2016	(88,336)	(88,336)
Accumulated other comprehensive loss	(2,178)	(1,875)
Accumulated deficit	(279,108)	(260,793)
Total shareholders’ equity	143,546	152,805
Total liabilities and shareholders’ equity	$ 201,774	$ 216,669

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Accounts receivable, allowances	$ 1,630	$ 2,002
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	42,806,279	41,424,377
Common stock, shares outstanding (in shares)	38,130,530	36,748,628
Treasury stock, shares (in shares)	4,675,749	4,675,749

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Net revenue	$ 220,544	$ 227,250	$ 188,313
Cost of revenue	114,565	114,090	92,967
Gross profit	105,979	113,160	95,346
Operating expenses
Research and development	73,993	68,784	67,482
Sales and marketing	23,300	22,877	22,290
General and administrative	18,860	20,862	19,641
Restructuring costs		9	999
Impairment of IP, mask sets and design tools	1,148	1,783	2,811
Total operating expenses	117,301	114,315	113,223
Loss from operations	(11,322)	(1,155)	(17,877)
Gain on sale of development project		7,551
Impairment of privately-held investments, net of gain on sale	(885)	159	(602)
Interest and other income, net	539	794	1,771
(Loss) income before income taxes	(11,668)	7,349	(16,708)
Provision for income taxes	6,647	7,191	4,993
Net (loss) income	$ (18,315)	$ 158	$ (21,701)
Net (loss) income per common share:
Basic (in dollars per share)	$ (0.49)	$ 0	$ (0.63)
Diluted (in dollars per share)	$ (0.49)	$ 0	$ (0.63)
Shares used in computing net (loss) income per share:
Basic (in shares)	37,429	35,890	34,693
Diluted (in shares)	37,429	36,669	34,693

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Net (loss) income	$ (18,315)	$ 158	$ (21,701)
Other comprehensive loss:
Change in currency translation adjustments, net of tax	(336)	(583)	(1,586)
Change in unrealized gains (losses) on marketable securities, net of tax	33	(181)	(176)
Other comprehensive loss	(303)	(764)	(1,762)
Comprehensive loss	$ (18,618)	$ (606)	$ (23,463)

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]	Accumulated Foreign Currency Adjustment Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Feb. 01, 2014	39,083,961	(4,659,143)
Balance at Feb. 01, 2014	$ 485,188	$ (88,198)	$ 149	$ 502	$ (239,250)	$ 158,391
Unrealized loss on marketable securities			(176)			(176)
Currency translation adjustments				(1,586)		(1,586)
Stock-based compensation expense	6,279					6,279
Net share settlement of equity awards	$ (231)					(231)
Net proceeds from common stock issued under share plans (in shares)	889,728
Net proceeds from common stock issued under share plans	$ 2,314					2,314
Net loss					(21,701)	(21,701)
Balance (in shares) at Jan. 31, 2015	39,973,689	(4,659,143)
Balance at Jan. 31, 2015	$ 493,550	$ (88,198)	(27)	(1,084)	(260,951)	143,290
Net share settlement of equity awards	(231)					(231)
Unrealized loss on marketable securities			(181)			(181)
Currency translation adjustments				(583)		(583)
Stock-based compensation expense	6,559					6,559
Net share settlement of equity awards	$ (81)	$ (138)				(219)
Net proceeds from common stock issued under share plans (in shares)	1,450,688
Net proceeds from common stock issued under share plans	$ 3,781					3,781
Net loss					158	158
Balance (in shares) at Jan. 30, 2016	41,424,377	(4,675,749)
Balance at Jan. 30, 2016	$ 503,809	$ (88,336)	(208)	(1,667)	(260,793)	152,805
Net share settlement of equity awards (in shares)		(16,606)
Net share settlement of equity awards	$ (81)	$ (138)				(219)
Unrealized loss on marketable securities						33
Net loss						(18,315)
Balance (in shares) at Jan. 28, 2017	42,806,279	(4,675,749)
Balance at Jan. 28, 2017	$ 513,168	$ (88,336)	$ (175)	$ (2,003)	$ (279,108)	$ 143,546

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Cash flows from operating activities
Net (loss) income	$ (18,315)	$ 158	$ (21,701)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	20,739	21,972	21,708
Stock-based compensation	6,505	6,559	6,279
Inventory Write-down	2,004	3,157	4,267
(Recovery of) Provision for sales returns, discounts, and doubtful accounts	(372)	500	1,202
Deferred income taxes	258	2,355	342
Gain on sale of development project		(7,551)
Impairment of intangibles, IP, mask sets, and design tools	1,148	1,783	2,811
Impairment (gain on sale) of privately-held investments	885	(136)	602
Other non-cash activities	(1,019)	(277)	239
Changes in operating assets and liabilities:
Accounts receivable	(5,126)	(4,447)	30
Inventory	6,558	(9,420)	(4,310)
Prepaid expenses and other current assets	4,365	(4,851)	(1,288)
Other non-current assets	(302)	(4,868)	3,124
Accounts payable	(12,046)	392	3,672
Accrued liabilities, compensation and related benefits	2,428	(5,294)	6,750
Income taxes payable	4,190	757	(2,134)
Other long-term liabilities	(182)	(7)	(5,917)
Net cash provided by operating activities	11,718	782	15,676
Cash flows from investing activities
Restricted cash	597	(500)	1,375
Purchases of marketable securities		(22,622)	(3,079)
Sales and maturities of marketable securities	3,584	24,705	15,603
Purchases of software, equipment and leasehold improvements	(10,708)	(6,862)	(8,722)
Purchases of IP	(8,283)	(7,193)	(3,612)
Reimbursement of costs related to purchased IP	3,008
Proceeds from sale of development project, net of transaction fees		7,551
Proceeds from sale of privately-held investment		518
Net cash received (paid) in connection with acquisition	289	(19,310)
Repayment of note receivable			230
Net cash (used in) provided by investing activities	(11,513)	(23,713)	1,795
Cash flows from financing activities
Net proceeds from exercise of employee stock options and stock purchase rights	3,489	3,781	2,314
Net share settlement of equity awards issued to employees	(635)	(219)	(231)
Net cash provided by financing activities	2,854	3,562	2,083
Effect of foreign exchange rate changes on cash and cash equivalents	(424)	(343)	(378)
Net increase (decrease) in cash and cash equivalents	2,635	(19,712)	19,176
Cash and cash equivalents, beginning of period	63,790	83,502	64,326
Cash and cash equivalents, end of period	66,425	63,790	83,502
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 2,516	$ 7,004	$ 6,085

Note 1 - Organization and Summa

Note 1 - Organization and Summary of Significant Accounting Policies	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]	1. Organization and nature of operations: two . A majority of our primary products are semiconductors that are targeted toward end-product manufacturers, Original Equipment Manufacturers, or OEMs, and Original Design Manufacturers, or ODMs. We derive a portion of our revenue from licensing and other activities, including licensing of our software development kits, and engineering support services for hardware and software. Basis of presentation: November 2015, Accounting period: 52 53 January 31 2017, January 28, 2017, 52 2016 2015, January 30, 2016 January 31, 2015 52 February 3, 2018, 53 Use of estimates in the preparation of consolidated financial statements: may Restructuring charges: 2016 2015, $0.1 $1.1 no 2017. Fair value of financial instruments: 820 three may Level 1 – Quoted prices in active markets for identical assets or liabilities Level 2 Observable inputs other than Level 1 Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. For certain of our assets and liabilities, including cash and cash equivalents, accounts receivable, accounts payable and other current liabilities, the carrying amounts approximate their fair value due to the relatively short maturity of these items. Marketable securities consist of available-for-sale securities that are reported at fair value with the related unrealized gains and losses included in accumulated other comprehensive income (loss), a component of shareholders’ equity. The fair value of cash equivalents and certain marketable securities is determined based on “Level 1” In accordance with the fair value accounting requirements, companies may Derivative financial instruments: 2015, may Cash and cash equivalents: 90 Short and long-term marketable securities: 90 one one may The difference between amortized cost (cost adjusted for amortization of premiums and accretion of discounts, which is recognized as an adjustment to interest income) and fair value, representing unrealized holding gains or losses, are recorded separately as a component of accumulated other comprehensive income (loss) within shareholders’ equity. Any gains and losses on the sale of marketable securities are determined based on the specific identification method. We monitor all of our marketable securities for impairment and if these securities are reported to have a decline in fair value, we use significant judgment to identify events or circumstances that would likely have a significant adverse effect on the future value of each investment including: (i) the nature of the investment; (ii) the cause and duration of any impairment; (iii) the financial condition and future prospects of the issuer; (iv) for securities with a reported decline in fair value, our ability to hold the security for a period of time sufficient to allow for any anticipated recovery of fair value; (v) the extent to which fair value may 2017, 2016 2015. Accounts receivable and allowances: We defer recognition of revenue and the related receivable when we cannot estimate whether collectability is reasonably assured at the time products and services are delivered to our customers. We also provide allowances for bad debt and sales returns. In establishing the allowance for bad debt, in cases where we are aware of circumstances that may In establishing the allowance for sales returns, we make estimates of potential future returns of products for which revenue has been recognized in the current period, including analyzing historical returns, current economic trends and changes in customer demand and acceptance of our products. Our allowance for sales returns, discounts and bad debt was $1.6 $2.0 January 28, 2017 January 30, 2016, may Inventory: first first We write-off inventory that is obsolete. Obsolescence is determined from several factors, including competitiveness of product offerings, market conditions and product life cycles. Provisions for excess and obsolete inventory are charged to cost of revenue. At the time of the loss recognition, a new, lower-cost basis for that inventory is established and subsequent changes in facts and circumstances do not result in the restoration or increase in that newly established cost basis. If this lower-cost inventory is subsequently sold, we will realize higher gross margins for those products. Inventory write-downs inherently involve assumptions and judgments as to amount of future sales and selling prices. As a result of our inventory valuation reviews, we charged provisions for excess and obsolete inventory of approximately $2.0 $3.2 $4.3 2017, 2016 2015, $0.3 $0.9 $0.6 2017, 2016 2015, Warranty: one may Software, equipment and leasehold improvements: (one five Business combinations : may Intangible and other long-lived assets: The amounts and useful lives assigned to intangible and other long-lived assets acquired, other than goodwill, impact the amount and timing of future amortization. Intangible assets include those acquired through business combinations and intellectual property that we purchase for incorporation into our product designs. We begin amortizing such intellectual property at the time that we begin shipment of the associated products into which it is incorporated. We amortize the intellectual property over the estimated useful life of the associated products, generally two three Goodwill is recorded as the difference, if any, between the aggregate consideration paid for an acquisition and the fair value of the net tangible and intangible assets acquired. Other intangible assets primarily represent purchased developed technology, customer relationships, purchased IP, non-compete agreements and trademarks. We currently amortize our intangible assets with definitive lives over periods ranging from three ten Impairment of goodwill and other long-lived assets: may We evaluate goodwill on an annual basis as of the last day of our fiscal year and whenever events or changes in circumstances indicate the carrying value may first two first one four second second Determining the fair value of a reporting unit is judgmental in nature and involves the use of significant estimates and assumptions. These estimates and assumptions include forecasts of revenue and operating margins used to calculate projected future cash flows, risk-adjusted discount rates, future economic and market conditions and a determination of appropriate market comparables. We base our fair value estimates on assumptions we believe to be reasonable at that time, however, actual future results may Long-term investments: Investments in private equity securities of less than 20% may Revenue recognition: 97%, 99% 97% 2017, 2016 2015, 100% 100% 6 On occasion, we derive revenue from the license of our internally developed intellectual property (“IP”). IP licensing agreements that we enter into generally provide licensees the right to incorporate our IP components in their products with terms and conditions that vary by licensee. Our license fee arrangements generally include multiple deliverables and we are required to determine whether there is more than one third Our process for determining our ESP for deliverables without VSOE or TPE considers multiple factors that may may For deliverables related to licenses of our technology that involve significant engineering services, we recognize revenue in accordance with the provisions of the proportional performance method or milestone method, as applicable. We determine costs associated with engineering services using actual labor dollars incurred and estimate other direct or incremental costs allocated based on the percentage of time the engineer(s) spent on the project. These costs are deferred until revenue recognition criteria have been met, at which time they are reclassified as cost of revenue. Licensing revenue deliverables are generally recognized using the milestone method. Under the milestone method, we recognize revenue that is contingent upon the achievement of a substantive milestone in its entirety in the period in which the milestone is achieved. To be considered substantive, the consideration earned by achieving the milestone should be (a) commensurate with either (i) the vendor’s performance to achieve the milestone or (ii) to the enhancement of the value of the item delivered as a result of a specific outcome resulting from the vendor’s performance to achieve the milestone (b) the consideration should relate solely to past performance, and (c) the consideration should be reasonable relative to all deliverables and payment terms in the arrangement. Other milestones that do not fall under the definition of a milestone under the milestone method are recognized under the authoritative guidance concerning revenue recognition. We derive a portion of our revenues in the form of fees from members of a wholly-owned entity dedicated to the marketing, development and proliferation of the Z-Wave brand. Membership fees vary based on level and are generally billed on an annual basis with no obligation to renew. Revenue from membership dues is recognized in the month earned. Membership dues received in advance are included in deferred revenue and recognized as revenue ratably over the appropriate period, which is generally twelve $1 .9 $1.9 $0.9 2017, 2016 2015, We defer revenue when payments are received from customers in advance of revenue recognition. Deferred revenue at both January 28, 2017 January 30, 2016 $0.4 Cost of revenue: Foreign currency: , property, plant and equipment, and liabilities are recorded at historical rates. Gains and losses from these remeasurements as well as other transaction gains and losses are included in interest and other income, net, in the consolidated statements of operations. Our subsidiaries that utilize foreign currency as their functional currency translate such currency into U.S. dollars using (i) the exchange rate on the balance sheet dates for assets and liabilities, and (ii) the average exchange rates prevailing during the period for revenues and expenses. Any translation adjustments resulting from this process are shown separately as a component of accumulated other comprehensive income (loss) within shareholders’ equity. Foreign currency transaction gains and losses resulted in net losses of approximately $0.1 $0.2 $1.0 2017, 2016 2015, Concentration of credit risk: may Sales to our recurring and new customers are generally made on open account, a prepaid or letter of credit basis. We perform ongoing credit evaluations of our customers and generally do not require collateral for sales on credit. We review our accounts receivable balances to determine if any receivables will potentially be uncollectible and include any amounts that are determined to be uncollectible in our allowance for doubtful accounts. Loss Contingencies : Income taxes: The impact of an uncertain income tax position on the income tax return must be recognized as the largest amount that is more-likely-than-not to be sustained upon audit by the relevant taxing authority. An uncertain income tax position will not be recognized if it has less than a 50% Stock-based compensation: . Stock option awards are measured using the Black-Scholes-Merton option pricing model. The value of the portion of the award that is ultimately expected to vest is recognized as expense on a ratable basis over the requisite service period for time-based awards and on a graded basis for performance-based awards in our consolidated statements of operations. We estimate forfeitures, based on historical experience, at the time of grant and revise our estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We recognize a benefit from stock-based compensation in the consolidated statements of shareholders’ equity if an excess tax benefit is realized. Further information regarding stock-based compensation can be found in Note 12, Research and development costs: Advertising costs: $0.2 $0.2 $0.1 2017, 2016 2015, Comprehensive income (loss): Recent accounting pronouncements: In November 2016, 2016 18, 230): 2016 18”). ASU 2016 18 first 2019 In October 2016, 2016 16, 740): 2016 16”), 2016 16 first 2019 . In March 2016, issued ASU No. 2016 09, 718): 2016 09”). 2016 09 us beginning in the first 2018. . In February 2016, 2016 02, 842) 2016 02”), 2016 02 2016 02 is effective for us beginning in the first 2020 . In May 2014, 2014 09, 606) 2014 09”), 2014 09 2014 09 first 2019 . Subsequently, the FASB has issued the following standards related to ASU 2014 09: 2016 08, 606): 2016 08”); 2016 10, 606): 2016 10”); 2016 12, 606): 2016 12”) 2016 20, 606, 2016 20”). 2016 08, 2016 10, 2016 12 2016 20 2014 09 606 February 4, 2018, 606

Note 2 - Cash, Cash Equivalents

Note 2 - Cash, Cash Equivalents and Marketable Securities	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Cash, Cash Equivalents, and Marketable Securities [Text Block]	2. cash equivalents and marketable securities As of January 28, 2017 January 3 0, 2016, $0.3 $0.9 January 28, 2017, January 30, 2016, January 28, 2017 January 30, 2016 Book V alue Net U nrealized Gains (Losses) Fair Value Book Value Net Unrealized Gains (Losses) Fair Value Money market funds $ 3,715 $ - $ 3,715 $ 88 $ - $ 88 Corporate bonds 3,506 (1 ) 3,505 7,052 (7 ) 7,045 Fixed income mutual funds 1,280 (4 ) 1,276 1,255 32 1,287 Total cash equivalents and marketable securities $ 8,501 $ (5 ) 8,496 $ 8,395 $ 25 8,420 Cash on hand held in the United States 9,378 4,141 Cash on hand held overseas 53,332 59,561 Total cash on hand 62,710 63,702 Total cash, cash equivalents and marketable securities $ 71,206 $ 72,122 Reported as: Cash and cash equivalents $ 66,425 $ 63,790 Short-term marketable securities 4,781 4,805 Long-term marketable securities - 3,527 $ 71,206 $ 72,122 The amortized cost and estimated fair value of cash equivalents and marketable securities, by contractual maturity, are as follows (in thousands): January 28, 2017 January 30, 2016 Book Value Fair Value Book Value Fair Value Due in one year or less $ 8,501 $ 8,496 $ 4,863 $ 4,893 Due in greater than one year - - 3,532 3,527 Total $ 8,501 $ 8,496 $ 8,395 $ 8,420

Note 3 - Fair Values of Assets

Note 3 - Fair Values of Assets and Liabilities	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Fair Value Disclosures [Text Block]	3. Determination of fair value Our cash equivalents and marketable securities are classified within Level 1 The tables below present the balances of our assets and liabilities measured at fair value on a recurring basis (in thousands): January 28, 2017 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market funds $ 3,715 $ 3,715 $ - $ - Corporate bonds 3,505 3,505 - - Fixed income mutual funds 1,276 1,276 - - Total cash equivalents and marketable securities 8,496 8,496 - - Restricted cash 303 303 - - Total assets measured at fair value $ 8,799 $ 8,799 $ - $ - January 30, 2016 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market funds $ 88 $ 88 $ - $ - Corporate bonds 7,045 7,045 Fixed income mutual funds 1,287 1,287 - - Total cash equivalents and marketable securities 8,420 8,420 - - Restricted cash 900 900 - - Total assets measured at fair value $ 9,320 $ 9,320 $ - $ - Assets measured and recorded at fair value on a non-recurring basis Our non-marketable preferred stock investments in privately-held venture capital funded technology companies are recorded at cost and are adjusted to fair value only in the event that they become other-than-temporarily impaired. As of January 28, 2017, one $2.0 may January 28, 2017. 2017, 2016 2015, $0.8 0.4 $0.6 20%

Note 4 - Derivative Financial I

Note 4 - Derivative Financial Instruments	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]	4. Foreign exchange contracts are recognized either as assets or as liabilities on the balance sheet at fair value at the end of each reporting period. We have used foreign currency derivatives such as forward and option contracts as hedges against certain anticipated transactions denominated in Israeli shekels, or NIS. We do not assess derivative contracts for hedge effectiveness and thus such contracts do not qualify for hedge accounting. Therefore, we recognize all gains and losses from changes in the fair value of these derivate contracts immediately into earnings. Changes in fair value of the derivatives are recorded as interest and other income, net. As of January 28, 2017 January 30, 2016, no zero 2017 2016 $0.1 2015.

Note 5 - Investments In Private

Note 5 - Investments In Privately-held Companies	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Investment Holdings [Text Block]	5. The following table sets forth the value of investments in and notes receivable from privately-held companies (in thousands): January 28, 2017 January 30, 2016 Investments Issuer A $ 2,000 $ 2,000 Issuer B - 750 Issuer C - 134 Total investments $ 2,000 $ 2,884 During fiscal 2009, $1.0 fourth 2010, $1.0 November 2010, $1.0 second 2015, In the third 2011, $1.0 fourth 2016 first second 2017, $0.3 $0.3 $0.4 effectively nullifying any value from this investment as of January 28, 2017 . In the third 2012, $0.1 second 2017, $0.1 effectively nullifying any value from this investment as of January 28, 2017. We made the above-described investments because we viewed the issuer as either having strategic technology or a business that would complement our technological capabilities or help create an opportunity for us to sell our chipset solutions. We analyze each investment quarterly for evidence of impairment. Our President and Chief Executive Officer is a member of the Board of Directors of both Issuer A and Issuer B. In the case of Issuer B, the investment transaction was negotiated without the personal involvement of the executive officer who had a personal interest in the transaction .

Note 6 - Supplemental Financial

Note 6 - Supplemental Financial Information	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Supplemental Balance Sheet Disclosures [Text Block]	6. financial information Inventory consists of the following (in thousands): January 28, 2017 January 30, 2016 Wafers and other purchased materials $ 8,595 $ 15,440 Work-in-process 2,780 2,885 Finished goods 6,772 8,384 Total inventory $ 18,147 $ 26,709 Prepaid expenses and other current assets consist of the following (in thousands): January 28, 2017 January 30, 2016 Prepayments for taxes $ 3,421 $ 3,357 Non-operating receivable 955 - Prepayments for royalties 776 741 Prepayments for inventory 442 3,725 Deposits 202 3,200 Other current assets 2,221 3,062 Total prepaid expenses and other current assets $ 8,017 $ 14,085 Software, equipment and leasehold improvements consist of the following (in thousands): Estimated Useful Lives (years) January 28, 2017 January 30, 2016 Software 3 - 5 $ 49,915 $ 40,411 Mask sets 3 18,209 14,130 Equipment 3 7,719 8,088 Office equipment and furniture 3 - 5 7,857 7,705 Leasehold improvements 1 - 5 2,108 2,089 Total 85,808 72,423 Less: Accumulated depreciation and amortization (67,285 ) (58,337 ) Total software, equipment and leasehold improvements, net $ 18,523 $ 14,086 Software, equipment and leasehold improvement depreciation and amortization expense for fiscal 2017, 2016 2015 $10.9 $12.6 $12.4 We recorded impairment charges of $0.3 $1.4 $2.1 2017, 2016, 2015, Accrued liabilities consist of the following (in thousands): January 28, 2017 January 30, 2016 License fees $ 5,578 $ 5,181 Income taxes payable, current portion 2,094 2,305 Rebates 1,585 2,864 Royalties 1,378 1,469 Warranties 783 959 Deferred revenue 350 407 Other accrued liabilities 1,839 1,447 Total accrued liabilities $ 13,607 $ 14,632 The following table summarizes activity related to accrued rebates (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Beginning balance $ 2,864 $ 9,599 $ 3,587 Charged as a reduction of revenue 4,121 11,724 17,845 Reversal of unclaimed rebates (224 ) (1,028 ) - Payments (5,176 ) (17,431 ) (11,833 ) Ending balance $ 1,585 $ 2,864 $ 9,599 Other long-term liabilities consist of the following (in thousands): January 28, 2017 January 30, 2016 License fees $ 5,400 $ 3,000 Deferred rent obligations 769 964 Other long-term liabilities 56 59 Total other long-term liabilities $ 6,225 $ 4,023

Note 7- Business Combination, G

Note 7- Business Combination, Goodwill and Intangible Assets	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Business Combination Disclosure [Text Block]	7. Business Combination In fiscal 2016, $19.4 $11.1 $12.6 $4.3 2017, $0.5 . Goodwill As of January 28, 2017, $10.6 no 2017 2016. and whenever events or changes in circumstances indicate the carrying value may Intangible Assets The table below presents the balances of our intangible assets (in thousands): January 28, 2017 January 30, 2016 Acquired intangible assets $ 88,910 $ 88,910 Purchased IP 42,500 38,956 Total 131,410 127,866 Accumulated amortization (100,666 ) (90,816 ) Intangible assets, net $ 30,744 $ 37,050 Acquired intangible assets represent intangible assets acquired through business combinations. Purchased intellectual property (“Purchased IP”) represents intangible assets acquired through direct purchases of licensed technology from vendors, which is incorporated into our products. Purchased IP not yet deployed relates to Purchased IP from third Impairment of intangible assets We test long-lived assets, including purchased intangible assets, for impairment whenever events or changes in circumstances, such as a change in technology, indicate that the carrying value of these assets may During fiscal 2017, 2017 $0.8 The review during fiscal 2016 2015 $0.4 $0.7 Intangible assets, subject to amortization, were as follows (in thousands, except for years): January 28, 2017 Gross Value Impairment Accumulated Amortization and Effect of Currency Translation Net Value Weighted Average Remaining Amortization Period (Years) Acquired intangible assets: Developed technology $ 85,427 $ (24,614 ) $ (52,854 ) $ 7,959 7.4 Customer relationships 54,505 (30,486 ) (20,897 ) 3,122 5.8 Trademarks and other 4,078 - (3,858 ) 220 1.9 Purchased IP - amortizing 36,007 (5,516 ) (23,057 ) 7,434 2.3 Total amortizing 180,017 (60,616 ) (100,666 ) 18,735 5.0 Purchased IP - not yet deployed 16,449 (4,440 ) - 12,009 Total intangibles $ 196,466 $ (65,056 ) $ (100,666 ) $ 30,744 January 30, 2016 Gross Value Impairment Accumulated Amortization and Effect of Currency Translation Net Value Weighted Average Remaining Amortization Period (Years) Acquired intangible assets: Developed technology $ 85,427 $ (24,614 ) $ (48,824 ) $ 11,989 6.5 Customer relationships 54,505 (30,486 ) (19,557 ) 4,462 5.7 Trademarks and other 4,078 - (3,739 ) 339 2.9 Purchased IP - amortizing 32,838 (5,516 ) (18,696 ) 8,626 2.9 Total amortizing 176,848 (60,616 ) (90,816 ) 25,416 5.1 Purchased IP - not yet deployed 15,774 (4,140 ) - 11,634 Total intangibles $ 192,622 $ (64,756 ) $ (90,816 ) $ 37,050 The following table presents the amortization of intangible assets in the accompanying consolidated statements of operations (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Cost of revenue $ 7,267 $ 7,586 $ 7,922 Operating expenses 2,586 1,722 1,418 Total intangible amortization expense $ 9,853 $ 9,308 $ 9,340 As of January 28, 2017, Fiscal years Purchased IP- Amortizing Developed Technology Customer Relationships Trademarks and other Total 2018 $ 3,513 $ 1,544 $ 543 $ 120 $ 5,720 2019 2,616 1,060 543 100 4,319 2020 1,230 1,060 543 - 2,833 2021 75 970 543 - 1,588 2022 - 700 543 - 1,243 Thereafter - 2,625 407 - 3,032 Total $ 7,434 $ 7,959 $ 3,122 $ 220 $ 18,735

Note 8 - Restructuring Costs

Note 8 - Restructuring Costs	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Restructuring and Related Activities Disclosure [Text Block]	8. In fiscal 2013, 2008 2013, The restructuring plan was completed in fiscal 2016.

Note 9 - Sale of Development Pr

Note 9 - Sale of Development Project	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Mergers, Acquisitions and Dispositions Disclosures [Text Block]	9. On March 8, 2013, third 21 September 30, 2013 $5.0 The Buyer advised us that it did not believe the milestones had been met by the deadline of September 30, 2013. May 19, 2014, September 5, 2014, June 1, 2015. August 2015, $5.0 $2.6 $7.6 2016.

Note 10 - Commitments and Conti

Note 10 - Commitments and Contingencies	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	10. Commitments Operating Leases Our primary facility in Fremont, California is leased under a non-cancelable lease. The lease carries a term of 81 January 1, 2015 October 2015. We also lease facilities in San Diego, Shanghai, Shenzhen, Hong Kong, Taiwan, Vietnam, South Korea, Japan, Singapore, Israel, Germany, France, Denmark and The Netherlands and have vehicles in Israel under non-cancelable leases. Aggregate future minimum annual payments under all operating leases are as follows (in thousands): Fiscal Years Operating Leases 2018 $ 3,803 2019 1,825 2020 1,167 2021 710 2022 463 Thereafter - Total minimum lease payments $ 7,968 Rent expense, recorded on a straight-line basis, was $3.7 $4 .0 $4.4 2017, 2016 2015, Purchase commitments We place non-cancelable orders to purchase semiconductor products from our suppliers on an eight twelve January 28, 2017, $16.1 Third-party licensed technology In October 2015, $6.1 December 2015 December 2018. January 28, 2017, $3 .0 $3.3 January 28, 2017. 2018. January 28, 2017. Design tools In June 2016, $7.8 August 2016 May 2019. As of January 28, 2017, $6 .5 $0.8 January 28, 2017. 2019. January 28, 2017. Royalties We pay royalties for the right to sell certain products under various license agreements. During fiscal 2017, 2016 2015, $5.0 $4.2 $2.5 Our wholly-owned subsidiary, Sigma Designs Israel SDI Ltd. (formerly CopperGate Communications, Ltd.), participated in programs sponsored by the Office of the Chief Scientist of Israel's Ministry of Industry, Trade and Labor, or the OCS, for the support of research and development activities that we conducted in Israel. Through January 28, 2017, $5.2 2013. 4.5% January 28, 2017, $1.2 Contingencies Product Warranty In general, we sell products with a one Details of the change in accrued warranty for fiscal 2017, 2016 2015 Fiscal Years Balance Beginning of Period Additions Deductions Balance End of Period 2015 $ 620 $ 763 $ (519 ) $ 864 2016 $ 864 $ 828 $ (733 ) $ 959 2017 $ 959 $ 493 $ (669 ) $ 783 Litigation From time to time, we are involved in claims and legal proceedings that arise in the ordinary course of business. We expect that the number and significance of these matters will increase as our business expands. In particular, we could face an increasing number of patent and other intellectual property claims as the number of products and competitors in our industry grows. Any claims or proceedings against us, whether meritorious or not, could be time consuming, result in costly litigation, require significant amounts of management time, result in the diversion of significant operational resources or cause us to enter into royalty or licensing agreements which, if required, may Adv anced Micro Device, Inc. Litigation: January 23, 2017, 7,633,506 7,796,133. January 24, 2017, 7,633,506 7,796,133. . Broadcom Corporation Litigation: March 7, 2017, 7,310,104. March 8, 2017, 8,284,844, 7,590,059, 8,068,171 7,342,967. Indemnifications In certain limited circumstances, we have agreed and may third . Our articles of incorporation and bylaws require that we indemnify our officers and directors against expenses, judgments, fines, settlements and other amounts actually and reasonably incurred in connection with any proceedings arising out of their services to us. In addition, we have entered into separate indemnification agreements with each of our directors and executive officers, which provide for indemnification of these individuals under similar circumstances and under additional circumstances. The indemnification obligations are more fully described in our charter documents and the form of indemnification agreement filed with our SEC reports. We purchase insurance to cover claims or a portion of the claims made against our directors and officers. Since a maximum obligation is not explicitly stated in our charter documents or in our indemnification agreements and will depend on the facts and circumstances that arise out of any future claims, if any, the overall maximum amount of the obligations cannot be reasonably estimated . Third-party licensed technology We regularly license technology from various third may . On February 10, 2017, one We may .

Note 11 - Earnings Per Share

Note 11 - Earnings Per Share	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Earnings Per Share [Text Block]	11. Basic net (loss) income per share is computed by dividing net (loss) income by the weighted-average number of common shares outstanding for the fiscal period. Diluted net loss per share is the same as basic net loss per share as the inclusion of potentially issuable shares is anti-dilutive. Diluted net income per share is computed by adjusting outstanding shares, assuming any dilutive effects of stock incentive awards calculated using the treasury stock method. Under the treasury stock method, an increase in the fair market value of our common stock results in a greater dilutive effect from outstanding stock options, restricted stock units and stock purchase rights. Additionally, the exercise of employee stock options and stock purchase rights and the vesting of restricted stock units results in a further dilutive effect on net income per share. The following table sets forth the basic and diluted net (loss) income per share computed for fiscal 2017, 2016 2015 Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Numerator: Net (loss) income, as reported $ (18,315 ) $ 158 $ (21,701 ) Denominator: Weighted-average common shares outstanding- basic 37,429 35,890 34,693 Dilutive effect of employee stock plans - 779 - Weighted-average common shares outstanding- diluted 37,429 36,669 34,693 Net (loss) income per share - basic $ (0.49 ) $ 0.00 $ (0.63 ) Net (loss) income per share - diluted $ (0.49 ) $ 0.00 $ (0.63 ) The weighted-average number of shares outstanding used in the computation of basic and diluted net (loss) income per share does not include the effect of the following potential outstanding shares of common stock. The effects of these potentially outstanding shares were not included in the calculation of basic and diluted net (loss) income per share because the effect would have been anti-dilutive (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Stock options 2,379 2,367 3,908 Restricted stock units and awards 514 232 166

Note 12 - Equity Incentive Plan

Note 12 - Equity Incentive Plans and Employee Benefits	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	12. Equity incentive plans We have adopted equity incentive plans that provide for the grant of stock awards to employees, directors and consultants that are designed to encourage and reward their long-term contributions to us and provide an incentive for them to remain with us. These plans are also intended to align our employees’ interest with the creation of long-term shareholder value. On July 10, 2015, 2015 “2015 2015 August 20, 2015. 2015 2001 “2001 2009 “2009 2001 Our 2015 may The total number of shares of the Company’s common stock reserved for issuance under the 2015 3,000,000 5,000,000 As of January 28, 2017, 1,914,637 2015 2,380,734 may 2015 September 23, 2009 August 20, 2015, 2001 2009 The majority of restricted stock units and restricted stock awards that vested during fiscal 2017, 2016 2015 85,465, 42,654 34,356 2017, 2016 2015, $1.5 $1 .5 $0.3 2017, 2016 2015, Stock Options The total stock option activities and balances of our stock option plans are summarized as follows: Number of Options Outstanding Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value As of February 1, 2014 4,094,621 $ 11.24 4.8 Granted (Weighted average fair value of $1.80) 467,400 4.54 Cancelled (734,702 ) 9.52 Exercised (59,261 ) 4.59 As of January 31, 2015 3,768,058 10.86 4.9 Granted (Weighted average fair value of $3.64) 104,200 8.74 Cancelled (415,146 ) 10.39 Exercised (523,441 ) 6.83 As of January 30, 2016 2,933,671 11.57 4.2 Granted (Weighted average fair value of $3.14) 483,400 6.87 Cancelled (556,616 ) 11.41 Exercised (194,884 ) 4.75 As of January 28, 2017 2,665,571 $ 11.25 4.5 $ 566,742 Ending vested and expected to vest 2,621,451 $ 11.33 4.4 $ 565,667 Ending exercisable 2,131,470 $ 12.35 3.3 $ 513,643 The aggregate intrinsic value, as of January 28, 2017, $6.40 2017, 2016 2015 $0.6 $1.6 $0.1 2017, 2016 2015 $0.5 $1 .3 $2.1 The options outstanding and currently exercisable as of January 28, 2017 Options Outstanding and Exercisable Range of Exercise Prices Number Outstanding Weighted Average Remaining Contractual Term (Years) Weighted Average Exercise Price Per Share Number Exercisable Weighted Average Exercise Price Per Share $0.92 - $4.98 297,053 6.95 $ 4.60 260,579 $ 4.55 $5.76 - $6.48 335,539 8.34 6.36 95,155 6.08 $6.49 - $7.30 294,240 7.56 6.80 171,982 6.60 $7.44 - $10.51 209,083 7.29 8.39 74,098 9.28 $10.59 - $10.59 318,700 2.97 10.59 318,700 10.59 $10.87 - $10.87 300,600 1.74 10.87 300,600 10.87 $11.07 - $11.09 353,934 2.39 11.08 353,934 11.08 $11.47 - $15.25 348,422 2.15 13.23 348,422 13.23 $15.64 - $41.58 164,000 1.29 33.83 164,000 33.83 $45.83 - $45.83 44,000 0.77 45.83 44,000 45.83 2,665,571 4.48 $ 11.25 2,131,470 $ 12.35 As of January 28, 2017, $1.5 3.0 The amortization period is based on the expected remaining vesting term of the options. Restricted Stock Awards Restricted stock awards, or RSAs, may 2015 one one 2009 ten one five January 28, 2017 January 30, 2016, no January 31, 2015, 44,189 $8.75. Restricted Stock Units We value restricted stock units, or RSUs, using the quoted market price of the underlying stock on the date of grant. RSUs are granted under our 2015 ten four one one 2015 one 2015 one All awards generally provide for accelerated vesting upon a change in control or normal or early retirement (as defined in the applicable stock incentive plan). During the fourth 2016, 299,971 two Stock-based compensation expense will be recognized over the requisite service period based on management’s best estimate of the probability of the performance criteria being satisfied using the most currently available projections of future sales performance, adjusted at each balance sheet date. Changes in the subjective and probability-based assumptions can materially affect the estimate of fair value of stock-based compensation and consequently, the related amount recognized in our consolidated statements of operations. As of January 28, 2017, 2017 2016 . The following table sets forth the shares of RSUs outstanding as of January 28, 2017: Restricted Stock Units Weighted Average Grant Date Fair Value per Unit Aggregate Intrinsic Value As of February 1, 2014 468,507 $ 5.78 2,197,298 Granted 1,157,127 4.91 Vested (257,315 ) 6.22 Cancelled/forfeited (54,404 ) 6.09 As of January 31, 2015 1,313,915 4.91 8,356,499 Granted 1,165,832 8.74 Vested (861,259 ) 5.52 Cancelled/forfeited (215,876 ) 7.37 As of January 30, 2016 1,402,612 7.53 9,299,318 Granted 1,057,944 7.42 Vested (783,909 ) 7.13 Cancelled/forfeited (38,029 ) 7.67 As of January 28, 2017 1,638,618 $ 7.64 $ 10,487,155 The total fair value of RSUs which vested during fiscal 2017, 2016 2015 $5.6 $4 .8 $1.6 The aggregate intrinsic value, as of January 28, 2017, $6.40 January 28, 2017, $9.8 3.0 Employee stock purchase plan On July 10, 2015, 2015 “2015 2015 August 20, 2015. 2015 2010 “2010 3,500,000 2015 2015 2015 may 15% $25,000 85% six 2015 During fiscal 2017, 2016 2015, 486,131, 92,122 626,966 $5.23, $5.37 $3.89 January 28, 2017, 2,921,747 3,500,000 2015 2015 2016 2010 2015 315,810 2,500,000 2010 During the first 2016, 2015 2010 may 2010 may 2018 2015. As of January 28, 2017, 42,684 2010 may $3.89 $0.4 may tender may 2015. may On August 22, 2016, 2010 $0.3 January 28, 2017 Valuation of stock-based compensation The fair value of RSA and RSU awards is based on the quoted market price of the underlying stock at the date of grant. The fair value of stock option and employee stock purchase plan right awards is estimated at the grant date using the Black-Scholes-Merton option pricing model. The determination of fair value of stock option and employee stock purchase plan right awards on the date of grant using an option-pricing model is affected by our stock price as well as assumptions regarding a number of highly complex and subjective variables. These variables include, but are not limited to, our expected stock price volatility over the term of the awards and actual employee stock option exercise behavior. The fair value of each stock option and employee stock purchase plan right was estimated on the date of grant using the Black-Scholes-Merton option pricing model with the following weighted-average assumptions: Fiscal Years Ended Stock options January 28, 2017 January 30, 2016 January 31, 2015 Expected volatility 50.77 % 44.84 % 42.72 % Risk-free interest rate 1.27 % 1.60 % 1.63 % Expected term (in years) 5.23 5.19 5.11 Dividend yield 0 % 0 % 0 % Weighted average fair value at grant date $ 3.14 $ 3.64 $ 1.80 Fiscal Years Ended Employee stock purchase plan January 28, 2017 January 30, 2016 January 31, 2015 Expected volatility 57.19 % 77.90 % 50.05 % Risk-free interest rate 0.50 % 0.44 % 0.08 % Expected term (in years) 0.50 0.46 0.50 Dividend yield 0 % 0 % 0 % Weighted average fair value at grant date $ 1.91 $ 2.24 $ 1.67 The computation of the expected volatility assumptions used in the Black-Scholes-Merton calculations for new stock option and employee stock purchase plan right awards is based on the historical volatility of our stock price, measured over a period equal to the expected term of the grants or purchase rights. The risk-free interest rate is based on the yield available on U.S. Treasury Strips with an equivalent remaining term. The expected term of stock options represents the weighted-average period that the stock options are expected to remain outstanding and was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based payment awards and vesting schedules. The expected term of employee stock purchase rights is the period of time remaining in the current offering period. The dividend yield assumption is based on our history of not paying dividends and assumption that we will not pay dividends in the future. Stock-based compensation expense related to purchases of common stock under the 2015 2010 2017, 2016 2015 $1.0 $0.2 $0.8 The following table sets forth the total stock-based compensation expense that is included in each functional line item in the consolidated statements of operations (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Cost of revenue $ 294 $ 227 $ 190 Research and development 3,452 3,241 3,147 Sales and marketing 1,197 1,151 979 General and administrative 1,562 1,940 1,963 Total stock-based compensation $ 6,505 $ 6,559 $ 6,279 Shares reserved for future issuance We had the following shares of common stock reserved for future issuance upon exercise or issuance of equity instruments at January 28, 2017: Shares Reserved Authorized for future grants under stock incentive plans 4,836,384 Stock options outstanding 2,665,571 Restricted stock units outstanding 1,638,618 Shares reserved for future issuance 9,140,573 401(k) We maintain a 401(k) 401(k) may $18 ,000 2016 . Employees age 50 may $6,000. 401(k) 2017 2016 $0.6 $0.3 no 2015. Endowment insurance pension plan Related to our acquisition of our DTV business in May 2012, 8.0% 20% April 2016 March 2017, 17,817 During fiscal 2017, 2016 2015, $2.3 $2 .3 $2.1 Retirement pension plans We maintain retirement pension plans for the benefit of qualified employees in Denmark, Taiwan, The Netherlands, and Germany. We made matching contributions under these plans of $0.7 2017, 2016 2015. Severance plan We maintain a severance plan for several Israeli employees pursuant to Israel's Severance Pay Law based on the most recent salary of the employees multiplied by the number of years of employment. Upon termination of employment, employees are entitled to one January 28, 2017, $0.8 $0.7 $0.1 2017, 2016 2015.

Note 13 - Income Taxes

Note 13 - Income Taxes	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Income Tax Disclosure [Text Block]	13. Income (loss) before income taxes consists of the following (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 United States $ (13,465 ) $ (23,129 ) $ 1,641 International 1,797 30,478 (18,349 ) Total $ (11,668 ) $ 7,349 $ (16,708 ) The federal, state and foreign income tax provision (benefit) is summarized as follows (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Current Federal $ 290 $ (150 ) $ (586 ) State 111 45 73 Foreign 5,990 4,915 5,164 Total current 6,391 4,810 4,651 Deferred: Federal - (290 ) - Foreign 256 2,671 342 Total deferred 256 2,381 342 Provision for income taxes $ 6,647 $ 7,191 $ 4,993 The tax effects of significant items comprising our deferred tax assets and liabilities are as follows (in thousands): January 28, 2017 January 30, 2016 Deferred tax assets: Net operating loss $ 11,196 $ 7,593 Investment impairment 545 1,131 Allowance, reserve and other 4,552 4,039 Depreciation 212 419 Tax credits 14,790 12,194 Stock-based compensation 6,636 8,420 Total gross deferred tax assets 37,931 33,796 Valuation allowance (35,073 ) (31,529 ) Total deferred tax assets 2,858 2,267 Deferred tax liabilities: Unrealized foreign exchange loss (594 ) (60 ) Acquired intangibles and other (1,926 ) (1,613 ) Net deferred tax assets $ 338 $ 594 We must regularly assess the likelihood that future taxable income levels will be sufficient to ultimately realize the tax benefits of our deferred tax assets. During the third 2013, January 28, 2017, may $3 .5 2017. As of January 28, 2017, $45 .8 $38.3 2019 2037. $16.1 $3.4 $2 0.8 $21 .5 2019. $12.0 $2.3 $12.1 . Net operating losses and tax credit carry forwards as of January 28, 2017 Amount Range of Expiration Years Net operating losses, federal $ 45,783 Through 2037 Net operating losses, state 38,281 Through 2037 Net operating losses, foreign 12,133 Indefinite Tax credits, federal 23,321 Through 2037 Tax credits, state $ 21,532 Indefinite Current federal and California tax laws include substantial restrictions on the utilization of net operating losses and tax credits in the event of an “ownership change” of a corporation. Accordingly, our ability to utilize net operating loss and tax credit carryforwards may The effective tax rate of our provision (benefit) for income taxes differs from the federal statutory rate as follows (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Computed at federal statutory rate of 35% $ (4,084 ) $ 2,572 $ (5,848 ) State taxes provision, net of federal benefit 72 29 47 Uncertain tax positions 4,401 3,778 (347 ) Difference between statutory rate and foreign effective tax rate 1,399 (1,474 ) 12,252 Stock-based compensation expense 423 (17 ) 819 Change in federal valuation allowance 5,542 4,098 (835 ) Tax credits (1,171 ) (1,708 ) (1,563 ) Other 65 (87 ) 468 Total $ 6,647 $ 7,191 $ 4,993 Included in the balance of unrecognized tax benefits as of January 28, 2017 $14 .9 Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Beginning balance $ 22,172 $ 15,504 $ 17,439 Additions based on tax positions related to the current year 5,549 5,449 1,373 Additions for tax positions of prior years 1,900 1,527 718 Reductions for tax positions of prior year - - (61 ) Lapse of statute of limitation (1,436 ) (308 ) (3,965 ) Ending balance $ 28,185 $ 22,172 $ 15,504 We have adopted the accounting policy that interest and penalties recognized are classified as part of our income taxes. In fiscal 2017, $0.5 $0.1 2016. January 28, 2017 January 30, 2016, $0.8 $0.3 $0.1 may Our operations are subject to income and transaction taxes in the United States and in multiple foreign jurisdictions. Significant estimates and judgments are required in determining our worldwide provision for income taxes. Some of these estimates are based on interpretations of existing tax laws or regulations. The ultimate amount of tax liability may Our tax filings for the fiscal years from 1991 2017 U.S. income taxes and foreign withholding taxes associated with the repatriation of earnings of foreign subsidiaries were not provided for on a cumulative total of $78.9 2017. Our acquired Israeli subsidiary, Sigma Designs Israel S.D.I. (formerly known as CopperGate Communications Ltd.), was granted “Approved Enterprise” status under the Law for the Encouragement of Capital Investments, 1959 2005, 2008, 2009 2014), 2011 2017, second 2015. two first five eight 12 14 $2.9 $0.08 2017, $4.1 $0.11 2016, $6.1 $0.18 2015.

Note 14 - Segment and Geographi

Note 14 - Segment and Geographical Information	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	14. Operating segments are defined as components of an enterprise for which separate financial information is available and evaluated regularly by the chief operating decision-maker in deciding how to allocate resources and in assessing performance. We are organized as, and operate in, one Our net revenue is derived principally from the sales of integrated SoC solutions, which we sell across both of our target markets. Connected Smart TV Platforms consist of all products that are sold into digital televisions as well as other adjacent markets using chipset products that are designed for video post-processing, products delivering IP streaming video, including hybrid versions of these products, and communication devices that use a standard protocol to connect equipment inside the home and stream IP-based video and audio, VoIP, or data through wired or wireless connectivity. IoT Devices consist of both smart home applications (including gateways and automated consumer devices) and mobile IoT applications (primarily tracking tags). Our smart home product line is marketed under our Z-Wave brand of wireless chips, modules and Z-Wave mesh networking protocol . During fiscal 2017, $5.0 Our License and other markets include revenue derived from the licensing of our technology to third 0.1%, zero 3% 2017, 2016 2015, Starting with the first 2017, one fourth 2016 . The following tables set forth net revenue attributable to each target market (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Connected Smart TV Platforms $ 175,085 $ 180,360 $ 151,775 IoT Devices 45,159 46,792 30,667 License and other 300 98 5,871 Net revenue $ 220,544 $ 227,250 $ 188,313 The following table sets forth net revenue for each geographic region based on the ship-to location of customers (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Asia $ 180,104 $ 172,773 $ 152,571 North America 32,732 42,335 20,746 Europe 7,692 10,292 12,012 Other Regions 16 1,850 2,984 Net revenue $ 220,544 $ 227,250 $ 188,313 The following table sets forth net revenue to each significant country based on the ship-to location of customers (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 China, including Hong Kong $ 110,195 $ 93,560 $ 70,513 Taiwan 51,093 50,301 24,346 United States 32,367 41,781 20,587 Thailand 9,487 13,532 40,703 Rest of the world 17,402 28,076 32,164 Net revenue $ 220,544 $ 227,250 $ 188,313 Our long-lived assets consist primarily of our software, equipment, and leasehold improvements. The following table sets forth our long-lived assets by geographic region based on the location of the asset (in thousands): Fiscal Years Ended January 28, 2017 January 30, 2016 United States $ 11,923 $ 5,885 Singapore 3,917 5,388 All other countries 2,683 2,813 Total long-lived assets $ 18,523 $ 14,086 The following table sets forth the major direct customers that accounted for 10% Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Sunjet Components Corps 20 % 16 % * Silicon Application 13 % * * Arris Global 14 % * * Benchmark Electronics * * 13 % *Accounted for less than 10% Net revenue from each of the aforementioned major direct customers was primarily generated through the Connected Smart TV Platforms market.

Note 15 - Collaborative Arrange

Note 15 - Collaborative Arrangement	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Collaborative Arrangement Disclosure [Text Block]	15. In September 2016, 50% third February 6, 2017, $2.5 three July 31, 2018 may Net loss from this collaborative arrangement was $0.3 2017 . There was no 2017.

Note 16 - Quarterly Financial I

Note 16 - Quarterly Financial Information (Unaudited)	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Quarterly Financial Information [Text Block]	16. The following table presents unaudited quarterly financial information for each of our most recent eight Fiscal Quarters Ended January 28, 2017 October 29, 2016 July 30, 2016 April 30, 2016 January 30, 2016 October 31, 2015 August 1, 2015 May 2, 2015 Net revenue $ 42,724 $ 62,729 $ 61,316 $ 53,775 $ 51,450 $ 61,581 $ 58,307 $ 55,912 Gross profit 21,401 30,995 29,582 24,001 24,501 30,787 28,524 29,348 (Loss) income from operations (7,163 ) 2,169 (313 ) (6,015 ) (5,237 ) 1,464 1,208 1,410 Net (loss) income (8,716 ) 221 (1,722 ) (8,098 ) (6,191 ) 6,435 296 (382 ) Basic net (loss) income per share $ (0.23 ) $ 0.01 $ (0.05 ) $ (0.22 ) $ (0.17 ) $ 0.18 $ 0.01 $ (0.01 ) Diluted net (loss) income per share $ (0.23 ) $ 0.01 $ (0.05 ) $ (0.22 ) $ (0.17 ) $ 0.17 $ 0.01 $ (0.01 )

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts and Reserves	12 Months Ended
	Jan. 28, 2017
Notes to Financial Statements
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS AND RESERVES Classification Balance Beginning of Period Additions: Provision for (Recovery of) Deductions: (Write-offs) Recoveries of Balance End of Period Allowance for returns, doubtful accounts and discounts: (in thousands) Fiscal Years 2015 $ 300 $ 1,257 $ (55 ) $ 1,502 2016 $ 1,502 $ 692 $ (192 ) $ 2,002 2017 $ 2,002 $ (372 ) $ - $ 1,630

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Jan. 28, 2017
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of presentation: November 2015,
Fiscal Period, Policy [Policy Text Block]	Accounting period: 52 53 January 31 2017, January 28, 2017, 52 2016 2015, January 30, 2016 January 31, 2015 52 February 3, 2018, 53
Use of Estimates, Policy [Policy Text Block]	Use of estimates in the preparation of financial statements: may
Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block]	Restructuring charges: 2016 2015, $0.1 $1.1 no 2017.
Fair Value Measurement, Policy [Policy Text Block]	Fair value of financial instruments: 820 three may Level 1 – Quoted prices in active markets for identical assets or liabilities Level 2 Observable inputs other than Level 1 Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. For certain of our assets and liabilities, including cash and cash equivalents, accounts receivable, accounts payable and other current liabilities, the carrying amounts approximate their fair value due to the relatively short maturity of these items. Marketable securities consist of available-for-sale securities that are reported at fair value with the related unrealized gains and losses included in accumulated other comprehensive income (loss), a component of shareholders’ equity. The fair value of cash equivalents and certain marketable securities is determined based on “Level 1” In accordance with the fair value accounting requirements, companies may
Derivatives, Policy [Policy Text Block]	Derivative financial instruments: 2015, may
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and cash equivalents: 90
Marketable Securities, Policy [Policy Text Block]	Short and long-term marketable securities: 90 one one may The difference between amortized cost (cost adjusted for amortization of premiums and accretion of discounts, which is recognized as an adjustment to interest income) and fair value, representing unrealized holding gains or losses, are recorded separately as a component of accumulated other comprehensive income (loss) within shareholders’ equity. Any gains and losses on the sale of marketable securities are determined based on the specific identification method. We monitor all of our marketable securities for impairment and if these securities are reported to have a decline in fair value, we use significant judgment to identify events or circumstances that would likely have a significant adverse effect on the future value of each investment including: (i) the nature of the investment; (ii) the cause and duration of any impairment; (iii) the financial condition and future prospects of the issuer; (iv) for securities with a reported decline in fair value, our ability to hold the security for a period of time sufficient to allow for any anticipated recovery of fair value; (v) the extent to which fair value may 2017, 2016 2015.
Receivables, Policy [Policy Text Block]	Accounts receivable and allowances: We defer recognition of revenue and the related receivable when we cannot estimate whether collectability is reasonably assured at the time products and services are delivered to our customers. We also provide allowances for bad debt and sales returns. In establishing the allowance for bad debt, in cases where we are aware of circumstances that may In establishing the allowance for sales returns, we make estimates of potential future returns of products for which revenue has been recognized in the current period, including analyzing historical returns, current economic trends and changes in customer demand and acceptance of our products. Our allowance for sales returns, discounts and bad debt was $1.6 $2.0 January 28, 2017 January 30, 2016, may
Inventory, Policy [Policy Text Block]	Inventory: first first We write-off inventory that is obsolete. Obsolescence is determined from several factors, including competitiveness of product offerings, market conditions and product life cycles. Provisions for excess and obsolete inventory are charged to cost of revenue. At the time of the loss recognition, a new, lower-cost basis for that inventory is established and subsequent changes in facts and circumstances do not result in the restoration or increase in that newly established cost basis. If this lower-cost inventory is subsequently sold, we will realize higher gross margins for those products. Inventory write-downs inherently involve assumptions and judgments as to amount of future sales and selling prices. As a result of our inventory valuation reviews, we charged provisions for excess and obsolete inventory of approximately $1.9 $3.2 $4.3 2017, 2016 2015, $0.3 $0.9 $0.6 2017, 2016 2015,
Standard Product Warranty, Policy [Policy Text Block]	Warranty: one may
Property, Plant and Equipment, Policy [Policy Text Block]	Software, equipment and leasehold improvements: (one five
Business Combinations Policy [Policy Text Block]	Business combinations : may
Goodwill and Intangible Assets, Policy [Policy Text Block]	Intangible and other long-lived assets: The amounts and useful lives assigned to intangible and other long-lived assets acquired, other than goodwill, impact the amount and timing of future amortization. Intangible assets include those acquired through business combinations and intellectual property that we purchase for incorporation into our product designs. We begin amortizing such intellectual property at the time that we begin shipment of the associated products into which it is incorporated. We amortize the intellectual property over the estimated useful life of the associated products, generally two three Goodwill is recorded as the difference, if any, between the aggregate consideration paid for an acquisition and the fair value of the net tangible and intangible assets acquired. Other intangible assets primarily represent purchased developed technology, customer relationships, purchased IP, non-compete agreements and trademarks. We currently amortize our intangible assets with definitive lives over periods ranging from three ten
Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block]	Impairment of goodwill and other long-lived assets: may We evaluate goodwill on an annual basis as of the last day of our fiscal year and whenever events or changes in circumstances indicate the carrying value may first two first one four second second Determining the fair value of a reporting unit is judgmental in nature and involves the use of significant estimates and assumptions. These estimates and assumptions include forecasts of revenue and operating margins used to calculate projected future cash flows, risk-adjusted discount rates, future economic and market conditions and a determination of appropriate market comparables. We base our fair value estimates on assumptions we believe to be reasonable at that time, however, actual future results may
Investment, Policy [Policy Text Block]	Long-term investments: Investments in private equity securities of less than 20% may
Revenue Recognition, Policy [Policy Text Block]	Revenue recognition: 97%, 99% 97% 2017, 2016 2015, 100% 100% 6 On occasion, we derive revenue from the license of our internally developed intellectual property (“IP”). IP licensing agreements that we enter into generally provide licensees the right to incorporate our IP components in their products with terms and conditions that vary by licensee. Our license fee arrangements generally include multiple deliverables and we are required to determine whether there is more than one third Our process for determining our ESP for deliverables without VSOE or TPE considers multiple factors that may may For deliverables related to licenses of our technology that involve significant engineering services, we recognize revenue in accordance with the provisions of the proportional performance method or milestone method, as applicable. We determine costs associated with engineering services using actual labor dollars incurred and estimate other direct or incremental costs allocated based on the percentage of time the engineer(s) spent on the project. These costs are deferred until revenue recognition criteria have been met, at which time they are reclassified as cost of revenue. Licensing revenue deliverables are generally recognized using the milestone method. Under the milestone method, we recognize revenue that is contingent upon the achievement of a substantive milestone in its entirety in the period in which the milestone is achieved. To be considered substantive, the consideration earned by achieving the milestone should be (a) commensurate with either (i) the vendor’s performance to achieve the milestone or (ii) to the enhancement of the value of the item delivered as a result of a specific outcome resulting from the vendor’s performance to achieve the milestone (b) the consideration should relate solely to past performance, and (c) the consideration should be reasonable relative to all deliverables and payment terms in the arrangement. Other milestones that do not fall under the definition of a milestone under the milestone method are recognized under the authoritative guidance concerning revenue recognition. We derive a portion of our revenues in the form of fees from members of a wholly-owned entity dedicated to the marketing, development and proliferation of the Z-Wave brand. Membership fees vary based on level and are generally billed on an annual basis with no obligation to renew. Revenue from membership dues is recognized in the month earned. Membership dues received in advance are included in deferred revenue and recognized as revenue ratably over the appropriate period, which is generally twelve $1 .9 $1.9 $0.9 2017, 2016 2015, We defer revenue when payments are received from customers in advance of revenue recognition. Deferred revenue at both January 28, 2017 January 30, 2016 $0.4
Cost of Sales, Policy [Policy Text Block]	Cost of revenue:
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign currency: , property, plant and equipment, and liabilities are recorded at historical rates. Gains and losses from these remeasurements as well as other transaction gains and losses are included in interest and other income, net, in the consolidated statements of operations. Our subsidiaries that utilize foreign currency as their functional currency translate such currency into U.S. dollars using (i) the exchange rate on the balance sheet dates for assets and liabilities, and (ii) the average exchange rates prevailing during the period for revenues and expenses. Any translation adjustments resulting from this process are shown separately as a component of accumulated other comprehensive income (loss) within shareholders’ equity. Foreign currency transaction gains and losses resulted in net losses of approximately $0.1 $0.2 $1.0 2017, 2016 2015,
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentration of credit risk: may Sales to our recurring and new customers are generally made on open account, a prepaid or letter of credit basis. We perform ongoing credit evaluations of our customers and generally do not require collateral for sales on credit. We review our accounts receivable balances to determine if any receivables will potentially be uncollectible and include any amounts that are determined to be uncollectible in our allowance for doubtful accounts.
Commitments and Contingencies, Policy [Policy Text Block]	Loss Contingencies :
Income Tax, Policy [Policy Text Block]	Income taxes: The impact of an uncertain income tax position on the income tax return must be recognized as the largest amount that is more-likely-than-not to be sustained upon audit by the relevant taxing authority. An uncertain income tax position will not be recognized if it has less than a 50%
Compensation Related Costs, Policy [Policy Text Block]	Stock-based compensation: . Stock option awards are measured using the Black-Scholes option pricing model. The value of the portion of the award that is ultimately expected to vest is recognized as expense on a ratable basis over the requisite service period for time-based awards and on a graded basis for performance-based awards in our consolidated statements of operations. We estimate forfeitures, based on historical experience, at the time of grant and revise our estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We recognize a benefit from stock-based compensation in the consolidated statements of shareholders’ equity if an excess tax benefit is realized. Further information regarding stock-based compensation can be found in Note 12,
Research and Development Expense, Policy [Policy Text Block]	Research and development costs:
Advertising Costs, Policy [Policy Text Block]	Advertising costs: $0.2 $0.2 $0.1 2017, 2016 2015,
Comprehensive Income, Policy [Policy Text Block]	Comprehensive income (loss):
New Accounting Pronouncements, Policy [Policy Text Block]	Recent accounting pronouncements: In November 2016, 2016 18, 230): 2016 18”). ASU 2016 18 first 2019 In March 2016, issued ASU No. 2016 09, 718): 2016 09”). 2016 09 us beginning in the first 2018. . In February 2016, 2016 02, 842) 2016 02”), 2016 02 2016 02 is effective for us beginning in the first 2020 . In May 2014, 2014 09, 606) 2014 09”), 2014 09 2014 09 first 2019 . Subsequently, the FASB has issued the following standards related to ASU 2014 09: 2016 08, 606): 2016 08”); 2016 10, 606): 2016 10”); 2016 12, 606): 2016 12”) 2016 20, 606, 2016 20”). 2016 08, 2016 10, 2016 12 2016 20 2014 09 606 February 4, 2018, 606

Note 2 - Cash, Cash Equivalen26

Note 2 - Cash, Cash Equivalents and Marketable Securities (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Cash, Cash Equivalents and Investments [Table Text Block]	January 28, 2017 January 30, 2016 Book V alue Net U nrealized Gains (Losses) Fair Value Book Value Net Unrealized Gains (Losses) Fair Value Money market funds $ 3,715 $ - $ 3,715 $ 88 $ - $ 88 Corporate bonds 3,506 (1 ) 3,505 7,052 (7 ) 7,045 Fixed income mutual funds 1,280 (4 ) 1,276 1,255 32 1,287 Total cash equivalents and marketable securities $ 8,501 $ (5 ) 8,496 $ 8,395 $ 25 8,420 Cash on hand held in the United States 9,378 4,141 Cash on hand held overseas 53,332 59,561 Total cash on hand 62,710 63,702 Total cash, cash equivalents and marketable securities $ 71,206 $ 72,122 Reported as: Cash and cash equivalents $ 66,425 $ 63,790 Short-term marketable securities 4,781 4,805 Long-term marketable securities - 3,527 $ 71,206 $ 72,122
Investments Classified by Contractual Maturity Date [Table Text Block]	January 28, 2017 January 30, 2016 Book Value Fair Value Book Value Fair Value Due in one year or less $ 8,501 $ 8,496 $ 4,863 $ 4,893 Due in greater than one year - - 3,532 3,527 Total $ 8,501 $ 8,496 $ 8,395 $ 8,420

Note 3 - Fair Values of Asset27

Note 3 - Fair Values of Assets and Liabilities (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	January 28, 2017 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market funds $ 3,715 $ 3,715 $ - $ - Corporate bonds 3,505 3,505 - - Fixed income mutual funds 1,276 1,276 - - Total cash equivalents and marketable securities 8,496 8,496 - - Restricted cash 303 303 - - Total assets measured at fair value $ 8,799 $ 8,799 $ - $ - January 30, 2016 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market funds $ 88 $ 88 $ - $ - Corporate bonds 7,045 7,045 Fixed income mutual funds 1,287 1,287 - - Total cash equivalents and marketable securities 8,420 8,420 - - Restricted cash 900 900 - - Total assets measured at fair value $ 9,320 $ 9,320 $ - $ -

Note 5 - Investments In Priva28

Note 5 - Investments In Privately-held Companies (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Schedule of Equity Investments in and Financing Notes Receivable from Privately Held Companies [Table Text Block]	January 28, 2017 January 30, 2016 Investments Issuer A $ 2,000 $ 2,000 Issuer B - 750 Issuer C - 134 Total investments $ 2,000 $ 2,884

Note 6 - Supplemental Financi29

Note 6 - Supplemental Financial Information (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Schedule of Inventory, Current [Table Text Block]	January 28, 2017 January 30, 2016 Wafers and other purchased materials $ 8,595 $ 15,440 Work-in-process 2,780 2,885 Finished goods 6,772 8,384 Total inventory $ 18,147 $ 26,709
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]	January 28, 2017 January 30, 2016 Prepayments for taxes $ 3,421 $ 3,357 Non-operating receivable 955 - Prepayments for royalties 776 741 Prepayments for inventory 442 3,725 Deposits 202 3,200 Other current assets 2,221 3,062 Total prepaid expenses and other current assets $ 8,017 $ 14,085
Property, Plant and Equipment [Table Text Block]	Estimated Useful Lives (years) January 28, 2017 January 30, 2016 Software 3 - 5 $ 49,915 $ 40,411 Mask sets 3 18,209 14,130 Equipment 3 7,719 8,088 Office equipment and furniture 3 - 5 7,857 7,705 Leasehold improvements 1 - 5 2,108 2,089 Total 85,808 72,423 Less: Accumulated depreciation and amortization (67,285 ) (58,337 ) Total software, equipment and leasehold improvements, net $ 18,523 $ 14,086
Schedule of Accrued Liabilities [Table Text Block]	January 28, 2017 January 30, 2016 License fees $ 5,578 $ 5,181 Income taxes payable, current portion 2,094 2,305 Rebates 1,585 2,864 Royalties 1,378 1,469 Warranties 783 959 Deferred revenue 350 407 Other accrued liabilities 1,839 1,447 Total accrued liabilities $ 13,607 $ 14,632
Other Current Liabilities [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Beginning balance $ 2,864 $ 9,599 $ 3,587 Charged as a reduction of revenue 4,121 11,724 17,845 Reversal of unclaimed rebates (224 ) (1,028 ) - Payments (5,176 ) (17,431 ) (11,833 ) Ending balance $ 1,585 $ 2,864 $ 9,599
Other Noncurrent Liabilities [Table Text Block]	January 28, 2017 January 30, 2016 License fees $ 5,400 $ 3,000 Deferred rent obligations 769 964 Other long-term liabilities 56 59 Total other long-term liabilities $ 6,225 $ 4,023

Note 7- Business Combination,30

Note 7- Business Combination, Goodwill and Intangible Assets (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Schedule of Finite-Lived Intangible Assets [Table Text Block]	January 28, 2017 January 30, 2016 Acquired intangible assets $ 88,910 $ 88,910 Purchased IP 42,500 38,956 Total 131,410 127,866 Accumulated amortization (100,666 ) (90,816 ) Intangible assets, net $ 30,744 $ 37,050
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]	January 28, 2017 Gross Value Impairment Accumulated Amortization and Effect of Currency Translation Net Value Weighted Average Remaining Amortization Period (Years) Acquired intangible assets: Developed technology $ 85,427 $ (24,614 ) $ (52,854 ) $ 7,959 7.4 Customer relationships 54,505 (30,486 ) (20,897 ) 3,122 5.8 Trademarks and other 4,078 - (3,858 ) 220 1.9 Purchased IP - amortizing 36,007 (5,516 ) (23,057 ) 7,434 2.3 Total amortizing 180,017 (60,616 ) (100,666 ) 18,735 5.0 Purchased IP - not yet deployed 16,449 (4,440 ) - 12,009 Total intangibles $ 196,466 $ (65,056 ) $ (100,666 ) $ 30,744 January 30, 2016 Gross Value Impairment Accumulated Amortization and Effect of Currency Translation Net Value Weighted Average Remaining Amortization Period (Years) Acquired intangible assets: Developed technology $ 85,427 $ (24,614 ) $ (48,824 ) $ 11,989 6.5 Customer relationships 54,505 (30,486 ) (19,557 ) 4,462 5.7 Trademarks and other 4,078 - (3,739 ) 339 2.9 Purchased IP - amortizing 32,838 (5,516 ) (18,696 ) 8,626 2.9 Total amortizing 176,848 (60,616 ) (90,816 ) 25,416 5.1 Purchased IP - not yet deployed 15,774 (4,140 ) - 11,634 Total intangibles $ 192,622 $ (64,756 ) $ (90,816 ) $ 37,050
Amortization of Intangible Assets [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Cost of revenue $ 7,267 $ 7,586 $ 7,922 Operating expenses 2,586 1,722 1,418 Total intangible amortization expense $ 9,853 $ 9,308 $ 9,340
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Fiscal years Purchased IP- Amortizing Developed Technology Customer Relationships Trademarks and other Total 2018 $ 3,513 $ 1,544 $ 543 $ 120 $ 5,720 2019 2,616 1,060 543 100 4,319 2020 1,230 1,060 543 - 2,833 2021 75 970 543 - 1,588 2022 - 700 543 - 1,243 Thereafter - 2,625 407 - 3,032 Total $ 7,434 $ 7,959 $ 3,122 $ 220 $ 18,735

Note 10 - Commitments and Con31

Note 10 - Commitments and Contingencies (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Fiscal Years Operating Leases 2018 $ 3,803 2019 1,825 2020 1,167 2021 710 2022 463 Thereafter - Total minimum lease payments $ 7,968
Schedule of Product Warranty Liability [Table Text Block]	Fiscal Years Balance Beginning of Period Additions Deductions Balance End of Period 2015 $ 620 $ 763 $ (519 ) $ 864 2016 $ 864 $ 828 $ (733 ) $ 959 2017 $ 959 $ 493 $ (669 ) $ 783

Note 11 - Earnings Per Share (T

Note 11 - Earnings Per Share (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Numerator: Net (loss) income, as reported $ (18,315 ) $ 158 $ (21,701 ) Denominator: Weighted-average common shares outstanding- basic 37,429 35,890 34,693 Dilutive effect of employee stock plans - 779 - Weighted-average common shares outstanding- diluted 37,429 36,669 34,693 Net (loss) income per share - basic $ (0.49 ) $ 0.00 $ (0.63 ) Net (loss) income per share - diluted $ (0.49 ) $ 0.00 $ (0.63 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Stock options 2,379 2,367 3,908 Restricted stock units and awards 514 232 166

Note 12 - Equity Incentive Pl33

Note 12 - Equity Incentive Plans and Employee Benefits (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	Number of Options Outstanding Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value As of February 1, 2014 4,094,621 $ 11.24 4.8 Granted (Weighted average fair value of $1.80) 467,400 4.54 Cancelled (734,702 ) 9.52 Exercised (59,261 ) 4.59 As of January 31, 2015 3,768,058 10.86 4.9 Granted (Weighted average fair value of $3.64) 104,200 8.74 Cancelled (415,146 ) 10.39 Exercised (523,441 ) 6.83 As of January 30, 2016 2,933,671 11.57 4.2 Granted (Weighted average fair value of $3.14) 483,400 6.87 Cancelled (556,616 ) 11.41 Exercised (194,884 ) 4.75 As of January 28, 2017 2,665,571 $ 11.25 4.5 $ 566,742 Ending vested and expected to vest 2,621,451 $ 11.33 4.4 $ 565,667 Ending exercisable 2,131,470 $ 12.35 3.3 $ 513,643
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]	Options Outstanding and Exercisable Range of Exercise Prices Number Outstanding Weighted Average Remaining Contractual Term (Years) Weighted Average Exercise Price Per Share Number Exercisable Weighted Average Exercise Price Per Share $0.92 - $4.98 297,053 6.95 $ 4.60 260,579 $ 4.55 $5.76 - $6.48 335,539 8.34 6.36 95,155 6.08 $6.49 - $7.30 294,240 7.56 6.80 171,982 6.60 $7.44 - $10.51 209,083 7.29 8.39 74,098 9.28 $10.59 - $10.59 318,700 2.97 10.59 318,700 10.59 $10.87 - $10.87 300,600 1.74 10.87 300,600 10.87 $11.07 - $11.09 353,934 2.39 11.08 353,934 11.08 $11.47 - $15.25 348,422 2.15 13.23 348,422 13.23 $15.64 - $41.58 164,000 1.29 33.83 164,000 33.83 $45.83 - $45.83 44,000 0.77 45.83 44,000 45.83 2,665,571 4.48 $ 11.25 2,131,470 $ 12.35
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	Restricted Stock Units Weighted Average Grant Date Fair Value per Unit Aggregate Intrinsic Value As of February 1, 2014 468,507 $ 5.78 2,197,298 Granted 1,157,127 4.91 Vested (257,315 ) 6.22 Cancelled/forfeited (54,404 ) 6.09 As of January 31, 2015 1,313,915 4.91 8,356,499 Granted 1,165,832 8.74 Vested (861,259 ) 5.52 Cancelled/forfeited (215,876 ) 7.37 As of January 30, 2016 1,402,612 7.53 9,299,318 Granted 1,057,944 7.42 Vested (783,909 ) 7.13 Cancelled/forfeited (38,029 ) 7.67 As of January 28, 2017 1,638,618 $ 7.64 $ 10,487,155
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Fiscal Years Ended Stock options January 28, 2017 January 30, 2016 January 31, 2015 Expected volatility 50.77 % 44.84 % 42.72 % Risk-free interest rate 1.27 % 1.60 % 1.63 % Expected term (in years) 5.23 5.19 5.11 Dividend yield 0 % 0 % 0 % Weighted average fair value at grant date $ 3.14 $ 3.64 $ 1.80 Fiscal Years Ended Employee stock purchase plan January 28, 2017 January 30, 2016 January 31, 2015 Expected volatility 57.19 % 77.90 % 50.05 % Risk-free interest rate 0.50 % 0.44 % 0.08 % Expected term (in years) 0.50 0.46 0.50 Dividend yield 0 % 0 % 0 % Weighted average fair value at grant date $ 1.91 $ 2.24 $ 1.67
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Cost of revenue $ 294 $ 227 $ 190 Research and development 3,452 3,241 3,147 Sales and marketing 1,197 1,151 979 General and administrative 1,562 1,940 1,963 Total stock-based compensation $ 6,505 $ 6,559 $ 6,279
Schedule of Shares Reserved For Future Issuance [Table Text Block]	Shares Reserved Authorized for future grants under stock incentive plans 4,836,384 Stock options outstanding 2,665,571 Restricted stock units outstanding 1,638,618 Shares reserved for future issuance 9,140,573

Note 13 - Income Taxes (Tables)

Note 13 - Income Taxes (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 United States $ (13,465 ) $ (23,129 ) $ 1,641 International 1,797 30,478 (18,349 ) Total $ (11,668 ) $ 7,349 $ (16,708 )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Current Federal $ 290 $ (150 ) $ (586 ) State 111 45 73 Foreign 5,990 4,915 5,164 Total current 6,391 4,810 4,651 Deferred: Federal - (290 ) - Foreign 256 2,671 342 Total deferred 256 2,381 342 Provision for income taxes $ 6,647 $ 7,191 $ 4,993
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	January 28, 2017 January 30, 2016 Deferred tax assets: Net operating loss $ 11,196 $ 7,593 Investment impairment 545 1,131 Allowance, reserve and other 4,552 4,039 Depreciation 212 419 Tax credits 14,790 12,194 Stock-based compensation 6,636 8,420 Total gross deferred tax assets 37,931 33,796 Valuation allowance (35,073 ) (31,529 ) Total deferred tax assets 2,858 2,267 Deferred tax liabilities: Unrealized foreign exchange loss (594 ) (60 ) Acquired intangibles and other (1,926 ) (1,613 ) Net deferred tax assets $ 338 $ 594
Summary of Operating Loss Carryforwards [Table Text Block]	Amount Range of Expiration Years Net operating losses, federal $ 45,783 Through 2037 Net operating losses, state 38,281 Through 2037 Net operating losses, foreign 12,133 Indefinite Tax credits, federal 23,321 Through 2037 Tax credits, state $ 21,532 Indefinite
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Computed at federal statutory rate of 35% $ (4,084 ) $ 2,572 $ (5,848 ) State taxes provision, net of federal benefit 72 29 47 Uncertain tax positions 4,401 3,778 (347 ) Difference between statutory rate and foreign effective tax rate 1,399 (1,474 ) 12,252 Stock-based compensation expense 423 (17 ) 819 Change in federal valuation allowance 5,542 4,098 (835 ) Tax credits (1,171 ) (1,708 ) (1,563 ) Other 65 (87 ) 468 Total $ 6,647 $ 7,191 $ 4,993
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Beginning balance $ 22,172 $ 15,504 $ 17,439 Additions based on tax positions related to the current year 5,549 5,449 1,373 Additions for tax positions of prior years 1,900 1,527 718 Reductions for tax positions of prior year - - (61 ) Lapse of statute of limitation (1,436 ) (308 ) (3,965 ) Ending balance $ 28,185 $ 22,172 $ 15,504

Note 14 - Segment and Geograp35

Note 14 - Segment and Geographical Information (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Connected Smart TV Platforms $ 175,085 $ 180,360 $ 151,775 IoT Devices 45,159 46,792 30,667 License and other 300 98 5,871 Net revenue $ 220,544 $ 227,250 $ 188,313
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Asia $ 180,104 $ 172,773 $ 152,571 North America 32,732 42,335 20,746 Europe 7,692 10,292 12,012 Other Regions 16 1,850 2,984 Net revenue $ 220,544 $ 227,250 $ 188,313
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 United States $ 11,923 $ 5,885 Singapore 3,917 5,388 All other countries 2,683 2,813 Total long-lived assets $ 18,523 $ 14,086
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 Sunjet Components Corps 20 % 16 % * Silicon Application 13 % * * Arris Global 14 % * * Benchmark Electronics * * 13 %
Geographic Concentration Risk [Member]
Notes Tables
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	Fiscal Years Ended January 28, 2017 January 30, 2016 January 31, 2015 China, including Hong Kong $ 110,195 $ 93,560 $ 70,513 Taiwan 51,093 50,301 24,346 United States 32,367 41,781 20,587 Thailand 9,487 13,532 40,703 Rest of the world 17,402 28,076 32,164 Net revenue $ 220,544 $ 227,250 $ 188,313

Note 16 - Quarterly Financial36

Note 16 - Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Quarterly Financial Information [Table Text Block]	Fiscal Quarters Ended January 28, 2017 October 29, 2016 July 30, 2016 April 30, 2016 January 30, 2016 October 31, 2015 August 1, 2015 May 2, 2015 Net revenue $ 42,724 $ 62,729 $ 61,316 $ 53,775 $ 51,450 $ 61,581 $ 58,307 $ 55,912 Gross profit 21,401 30,995 29,582 24,001 24,501 30,787 28,524 29,348 (Loss) income from operations (7,163 ) 2,169 (313 ) (6,015 ) (5,237 ) 1,464 1,208 1,410 Net (loss) income (8,716 ) 221 (1,722 ) (8,098 ) (6,191 ) 6,435 296 (382 ) Basic net (loss) income per share $ (0.23 ) $ 0.01 $ (0.05 ) $ (0.22 ) $ (0.17 ) $ 0.18 $ 0.01 $ (0.01 ) Diluted net (loss) income per share $ (0.23 ) $ 0.01 $ (0.05 ) $ (0.22 ) $ (0.17 ) $ 0.17 $ 0.01 $ (0.01 )

Schedule II - Valuation and Q37

Schedule II - Valuation and Qualifying Accounts and Reserves (Tables)	12 Months Ended
	Jan. 28, 2017
Notes Tables
Summary of Valuation Allowance [Table Text Block]	Classification Balance Beginning of Period Additions: Provision for (Recovery of) Deductions: (Write-offs) Recoveries of Balance End of Period Allowance for returns, doubtful accounts and discounts: (in thousands) Fiscal Years 2015 $ 300 $ 1,257 $ (55 ) $ 1,502 2016 $ 1,502 $ 692 $ (192 ) $ 2,002 2017 $ 2,002 $ (372 ) $ - $ 1,630

Note 1 - Organization and Sum38

Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Restructuring and Related Cost, Incurred Cost	$ 0	$ 100	$ 1,100
Sales Discounts, Returns and Allowances, Goods	1,600	2,000
Inventory Write-down	$ 2,004	$ 3,157	$ 4,267
Number of Reporting Units	1
Percentage of Net Revenue Products	97.00%	99.00%	97.00%
Percentage of Potential Returns Accrued Upon Sale	100.00%
Percentage of Potential Rebates Accrued Upon Sale	100.00%
Membership Dues Revenue, On-going	$ 1,900	$ 1,900	$ 900
Interest and Other Income, Net [Member]
Foreign Currency Transaction Gain (Loss), Realized	(100)	(200)	(1,000)
Selling and Marketing Expense [Member]
Advertising Expense	200	200	100
Accounts Payable and Accrued Liabilities [Member]
Deferred Revenue	$ 400
Minimum [Member]
Property, Plant and Equipment, Useful Life	1 year
Finite-Lived Intangible Asset, Useful Life	3 years
Minimum [Member] | Purchased IP [Member]
Finite-Lived Intangible Asset, Useful Life	2 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	5 years
Finite-Lived Intangible Asset, Useful Life	10 years
Maximum [Member] | Purchased IP [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Inventory Valuation and Obsolescence [Member]
Cost of Goods Sold	$ 300	$ 900	$ 600

Note 2 - Cash, Cash Equivalen39

Note 2 - Cash, Cash Equivalents and Marketable Securities (Details Textual) - USD ($) $ in Millions	Jan. 28, 2017	Jan. 30, 2016
Restricted Cash and Cash Equivalents	$ 0.3	$ 0.9

Note 2 - Cash, Cash Equivalen40

Note 2 - Cash, Cash Equivalents and Marketable Securities - Schedule of Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
Book Value	$ 8,501	$ 8,395
Net Unrealized Gains	(5)	25
Fair Value	8,496	8,420
Fair value - cash on hand	62,710	63,702
Total cash, cash equivalents and marketable securities	71,206	72,122
Cash and cash equivalents	66,425	63,790	$ 83,502	$ 64,326
Short-term marketable securities	4,781	4,805
Long-term marketable securities		3,527
UNITED STATES
Fair value - cash on hand	9,378	4,141
Overseas [Member]
Fair value - cash on hand	53,332	59,561
Money Market Funds [Member]
Book Value	3,715	88
Net Unrealized Gains
Fair Value	3,715	88
Corporate Bond Securities [Member]
Book Value	3,506	7,052
Net Unrealized Gains	(1)	(7)
Fair Value	3,505	7,045
Fixed Income Funds [Member]
Book Value	1,280	1,255
Net Unrealized Gains	(4)	32
Fair Value	$ 1,276	$ 1,287

Note 2 - Cash, Cash Equivalen41

Note 2 - Cash, Cash Equivalents and Marketable Securities - Amortized Cost and Estimated Fair Value of Cash Equivalents and Marketable Securities by Maturity (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Book Value	$ 8,501	$ 8,395
Fair Value	8,496	8,420
Due in One Year or Less [Member]
Book Value	8,501	4,863
Fair Value	8,496	4,893
Due in Greater Than One Year [Member]
Book Value		3,532
Fair Value		$ 3,527

Note 3 - Fair Values of Asset42

Note 3 - Fair Values of Assets and Liabilities (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Issuers B and C [Member] | Preferred Stock Investments [Member]
Other than Temporary Impairment Losses, Investments	$ 0.8	$ 0.4	$ 0.6
Equity Investments and Promissory Notes Receivable [Member]
Investment Owned, at Cost	$ 2

Note 3 - Fair Values of Asset43

Note 3 - Fair Values of Assets and Liabilities - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Cash equivalents and short-term investments	$ 8,496	$ 8,420
Restricted cash	303	900
Total assets measured at fair value	8,799	9,320
Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	8,496	8,420
Restricted cash	303	900
Total assets measured at fair value	8,799	9,320
Money Market Funds [Member]
Cash equivalents and short-term investments	3,715	88
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	3,715	88
Corporate Bond Securities [Member]
Cash equivalents and short-term investments	3,505	7,045
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	3,505	7,045
Fixed Income Investments [Member]
Cash equivalents and short-term investments	1,276	1,287
Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	$ 1,276	$ 1,287

Note 4 - Derivative Financial44

Note 4 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 0	$ 0
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative, Notional Amount	$ 0	$ 0
Maximum [Member]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments			$ (100)

Note 5 - Investments In Priva45

Note 5 - Investments In Privately-held Companies (Details Textual) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 29, 2011	Oct. 30, 2010	Jan. 30, 2010	Jan. 31, 2009	Nov. 30, 2010
Issuer A [Member]
Notes, Loans and Financing Receivable, Gross, Noncurrent								$ 1
Issuer A [Member] | Preferred Stock Investments [Member]
Payments to Acquire Investments						$ 1	$ 1
Issuer B [Member] | Preferred Stock Investments [Member]
Payments to Acquire Investments					$ 1
Other than Temporary Impairment Losses, Investments	$ 0.4	$ 0.3	$ 0.3
Issuer C [Member]
Payments to Acquire Investments				$ 0.1
Issuer C [Member] | Preferred Stock Investments [Member]
Other than Temporary Impairment Losses, Investments	$ 0.1

Note 5 - Investments in Priva46

Note 5 - Investments in Privately-held Companies - Value of Investments In Privately-held Companies (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Equity investments	$ 2,000	$ 2,884
Issuer A [Member]
Equity investments	2,000	2,000
Issuer B [Member]
Equity investments		750
Issuer C [Member]
Equity investments		$ 134

Note 6 - Supplemental Financi47

Note 6 - Supplemental Financial Information (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Depreciation, Depletion and Amortization, Nonproduction	$ 10.9	$ 12.6	$ 12.4
Design Tools [Member]
Tangible Asset Impairment Charges	$ 0.3	$ 1.4	$ 2.1

Note 6 - Supplemental Financi48

Note 6 - Supplemental Financial Information - Inventory (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Wafers and other purchased materials	$ 8,595	$ 15,440
Work-in-process	2,780	2,885
Finished goods	6,772	8,384
Total inventory	$ 18,147	$ 26,709

Note 6 - Supplemental Financi49

Note 6 - Supplemental Financial Information - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Prepayments for taxes	$ 3,421	$ 3,357
Non-operating receivable	955
Prepayments for royalties	776	741
Prepayments for inventory	442	3,725
Deposits	202	3,200
Other current assets	2,221	3,062
Total prepaid expenses and other current assets	$ 8,017	$ 14,085

Note 6 - Supplemental Financi50

Note 6 - Supplemental Financial Information - Software, Equipment and Leasehold Improvements (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016
Property, plant, and equipment, gross	$ 85,808	$ 72,423
Less: Accumulated depreciation and amortization	(67,285)	(58,337)
Total software, equipment and leasehold improvements, net	$ 18,523	14,086
Minimum [Member]
Property, Plant and Equipment, Useful Life	1 year
Maximum [Member]
Property, Plant and Equipment, Useful Life	5 years
Software and Software Development Costs [Member]
Property, Plant and Equipment, Useful Life
Property, plant, and equipment, gross	$ 49,915	40,411
Software and Software Development Costs [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Software and Software Development Costs [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	5 years
Mask Sets [Member]
Property, Plant and Equipment, Useful Life	3 years
Property, plant, and equipment, gross	$ 18,209	14,130
Mask Sets [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life
Mask Sets [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life
Equipment [Member]
Property, Plant and Equipment, Useful Life	3 years
Property, plant, and equipment, gross	$ 7,719	8,088
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life
Office Equipment [Member]
Property, Plant and Equipment, Useful Life
Property, plant, and equipment, gross	$ 7,857	7,705
Office Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Office Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	5 years
Leasehold Improvements [Member]
Property, plant, and equipment, gross	$ 2,108	$ 2,089
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	5 years

Note 6 - Supplemental Financi51

Note 6 - Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
License fees	$ 5,578	$ 5,181
Income taxes payable, current portion	2,094	2,305
Rebates	1,585	2,864	$ 9,599	$ 3,587
Royalties	1,378	1,469
Warranties	783	959	$ 864	$ 620
Deferred revenue	350	407
Other accrued liabilities	1,839	1,447
Total accrued liabilities	$ 13,607	$ 14,632

Note 6 - Supplemental Financi52

Note 6 - Supplemental Financial Information - Accrued Rebate Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Beginning balance	$ 2,864	$ 9,599	$ 3,587
Charged as a reduction of revenue	4,121	11,724	17,845
Reversal of unclaimed rebates	(224)	(1,028)
Payments	(5,176)	(17,431)	(11,833)
Ending balance	$ 1,585	$ 2,864	$ 9,599

Note 6 - Supplemental Financi53

Note 6 - Supplemental Financial Information - Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Other long-term liabilities	$ 6,225	$ 4,023
License Fees [Member]
Other long-term liabilities	5,400	3,000
Deferred Rent Obligations [Member]
Other long-term liabilities	769	964
Other Long-term Liabilities [Member]
Other long-term liabilities	$ 56	$ 59

Note 7- Business Combination,54

Note 7- Business Combination, Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Goodwill	$ 10,594	$ 11,068
Goodwill, Impairment Loss	0	0
Intellectual Property [Member]
Impairment of Intangible Assets, Finite-lived	800	400	$ 700
Bretelon, Inc. [Member]
Business Combination, Consideration Transferred		19,400
Goodwill	10,600	11,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		12,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		$ 4,300
Goodwill, Purchase Accounting Adjustments	$ (500)

Note 7 - Business Combination,

Note 7 - Business Combination, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Finite-lived intangible assets, gross	$ 131,410	$ 127,866
Accumulated amortization	(100,666)	(90,816)
Intangible assets, net	30,744	37,050
Acquired Intangible Assets [Member]
Finite-lived intangible assets, gross	88,910	88,910
Purchased IP [Member]
Finite-lived intangible assets, gross	$ 42,500	$ 38,956

Note 7 - Business Combination56

Note 7 - Business Combination, Goodwill and Intangible Assets - Acquired Intangible Assets, Subject to Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016
Gross value	$ 196,466	$ 192,622
Impairment	(65,056)	(64,756)
Accumulated amortization	(100,666)	(90,816)
Net value	30,744	37,050
Developed Technology Rights [Member]
Gross value	85,427	85,427
Impairment	(24,614)	(24,614)
Accumulated amortization	(52,854)	(48,824)
Net value	$ 7,959	$ 11,989
Weighted average remaining amortization period (Year)	7 years 146 days	6 years 182 days
Customer Relationships [Member]
Gross value	$ 54,505	$ 54,505
Impairment	(30,486)	(30,486)
Accumulated amortization	(20,897)	(19,557)
Net value	$ 3,122	$ 4,462
Weighted average remaining amortization period (Year)	5 years 292 days	5 years 255 days
Trademarks and Other [Member]
Gross value	$ 4,078	$ 4,078
Impairment
Accumulated amortization	(3,858)	(3,739)
Net value	$ 220	$ 339
Weighted average remaining amortization period (Year)	1 year 328 days	2 years 328 days
Purchased IP-Amortizing [Member]
Gross value	$ 36,007	$ 32,838
Impairment	(5,516)	(5,516)
Accumulated amortization	(23,057)	(18,696)
Net value	$ 7,434	$ 8,626
Weighted average remaining amortization period (Year)	2 years 109 days	2 years 328 days
Acquired Intangible Assets Subtotal [Member]
Gross value	$ 180,017	$ 176,848
Impairment	(60,616)	(60,616)
Accumulated amortization	(100,666)	(90,816)
Net value	$ 18,735	$ 25,416
Weighted average remaining amortization period (Year)	5 years	5 years 36 days
Purchased Intellectual Property - not yet deployed [Member]
Gross value	$ 16,449	$ 15,774
Impairment	(4,440)	(4,140)
Accumulated amortization
Net value	$ 12,009	$ 11,634

Note 7 - Business Combination57

Note 7 - Business Combination, Goodwill and Intangible Assets - Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Intangible asset amortization expense	$ 9,853	$ 9,308	$ 9,340
Cost of Sales [Member]
Intangible asset amortization expense	7,267	7,586	7,922
Operating Expense [Member]
Intangible asset amortization expense	$ 2,586	$ 1,722	$ 1,418

Note 7 - Business Combination58

Note 7 - Business Combination, Goodwill and Intangible Assets - Future Amortization Expense of Intangible Assets (Details) $ in Thousands	Jan. 28, 2017USD ($)
2,018	$ 5,720
2,019	4,319
2,020	2,833
2,021	1,588
2,022	1,243
Thereafter	3,032
Total	18,735
Purchased IP-Amortizing [Member]
2,018	3,513
2,019	2,616
2,020	1,230
2,021	75
2,022
Thereafter
Total	7,434
Developed Technology Rights [Member]
2,018	1,544
2,019	1,060
2,020	1,060
2,021	970
2,022	700
Thereafter	2,625
Total	7,959
Customer Relationships [Member]
2,018	543
2,019	543
2,020	543
2,021	543
2,022	543
Thereafter	407
Total	3,122
Trademarks [Member]
2,018	120
2,019	100
2,020
2,021
2,022
Thereafter
Total	$ 220

Note 9 - Sale of Development 59

Note 9 - Sale of Development Project (Details Textual) $ in Millions	Mar. 08, 2013USD ($)	Aug. 31, 2015USD ($)
Number of Employees Transferred	21
The Buyer Vs. the Entity [Member]
Litigation Settlement, Amount		$ 7.6
The Buyer Vs. the Entity [Member] | Litigation Award, Not Including Legal Costs, Interest, and Other Associated Expenses [Member]
Litigation Settlement, Amount		5
The Buyer Vs. the Entity [Member] | Litigation Award, Amount to Recover Legal Costs, Interest, and Other Associated Expenses [Member]
Litigation Settlement, Amount		$ 2.6
Additional After Timely First Milestone [Member]
Revenue Recognition, Milestone Method, Revenue Recognized	$ 5

Note 10 - Commitments and Con60

Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jun. 30, 2016	Oct. 31, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Operating Leases, Rent Expense			$ 3.7	$ 4	$ 4.4
Purchase Commitment, Remaining Minimum Amount Committed			$ 16.1
Percentage of Royalties			4.50%
Accrued Royalties			$ 1.2
Research and Development [Member]
Proceeds from Grantors			5.2
Cost of Sales [Member]
Direct Operating Cost, Royalty Expense			5	$ 4.2	$ 2.5
Licensed Technology from Supplier One [Member]
Long-term Purchase Commitment, Amount		$ 6.1
Remaining Long Term Purchase Commitment Amount			3
Licensed Technology from Supplier Two [Member]
Long-term Purchase Commitment, Amount			3.3
Design Tool Licenses from Supplier One [Member]
Long-term Purchase Commitment, Amount	$ 7.8
Remaining Long Term Purchase Commitment Amount			6.5
Design Tool Licenses from Supplier Two [Member]
Long-term Purchase Commitment, Amount			$ 0.8
Primary Facility in Fremont, California [Member]
Lessee Leasing Arrangements, Operating Leases, Term of Contract			6 years 270 days

Note 10 - Commitments and Con61

Note 10 - Commitments and Contingencies - Future Minimum Annual Payments under Operating Leases (Details) $ in Thousands	Jan. 28, 2017USD ($)
2,018	$ 3,803
2,019	1,825
2,020	1,167
2,021	710
2,022	463
Thereafter
Total minimum lease payments	$ 7,968

Note 10 - Commitments and Con62

Note 10 - Commitments and Contingencies - Change in Accrued Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Balance, beginning of period	$ 959	$ 864	$ 620
Additions	493	828	763
Deductions	(669)	(733)	(519)
Balance, end of period	$ 783	$ 959	$ 864

Note 11 - Earnings Per Share -

Note 11 - Earnings Per Share - Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Net (loss) income	$ (8,716)	$ 221	$ (1,722)	$ (8,098)	$ (6,191)	$ 6,435	$ 296	$ (382)	$ (18,315)	$ (18,315)	$ 158	$ (21,701)
Weighted-average common shares outstanding- basic (in shares)									37,429		35,890	34,693
Dilutive effect of employee stock plans (in shares)											779
Weighted-average common shares outstanding- diluted (in shares)									37,429		36,669	34,693
Basic (in dollars per share)	$ (0.23)	$ 0.01	$ (0.05)	$ (0.22)	$ (0.17)	$ 0.18	$ 0.01	$ (0.01)	$ (0.49)		$ 0	$ (0.63)
Diluted (in dollars per share)	$ (0.23)	$ 0.01	$ (0.05)	$ (0.22)	$ (0.17)	$ 0.17	$ 0.01	$ (0.01)	$ (0.49)		$ 0	$ (0.63)

Note 11 - Earnings Per Share 64

Note 11 - Earnings Per Share - Excluded Anti-diluted and Excluded Potentially Dilutive Securities (Details) - shares shares in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Employee Stock Option [Member]
Anti-dilutive securities (in shares)	2,379	2,367	3,908
Restricted Stock Units (RSUs) [Member]
Anti-dilutive securities (in shares)	514	232	166

Note 12 - Equity Incentive Pl65

Note 12 - Equity Incentive Plans and Employee Benefits (Details Textual)	Aug. 20, 2015USD ($)	Jan. 30, 2016USD ($)$ / sharesshares	Jan. 28, 2017CNY (¥)	Jan. 28, 2017USD ($)$ / sharesshares	Jan. 28, 2017USD ($)$ / sharesshares	Jan. 30, 2016USD ($)$ / sharesshares	Jan. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2015$ / shares	Feb. 01, 2014$ / sharesshares
Common Stock, Capital Shares Reserved for Future Issuance | shares				9,140,573	9,140,573
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares				4,836,384	4,836,384
Payments Related to Tax Withholding for Share-based Compensation					$ 1,500,000	$ 1,500,000	$ 300,000
Share Price | $ / shares				$ 6.40	$ 6.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value					$ 600,000	1,600,000	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value					500,000	1,300,000	2,100,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options				$ 1,500,000	$ 1,500,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					3 years
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount					$ 18,000
Allocated Share-based Compensation Expense					6,505,000	6,559,000	6,279,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Additional Amount for Employees Over Age 50					6,000
Pension Plan [Member] | Tax Deferred Savings Plan 401k [Member]
Defined Contribution Plan, Cost Recognized					$ 600,000	300,000	0
Endowment Insurance Pension Plan [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent					8.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount | ¥			¥ 17,817
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay					20.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount					$ 2,300,000	2,300,000	2,100,000
Retirement Pension Plans in Denmark, Taiwan, The Netherlands, and Germany [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount					700,000	700,000	700,000
Severance Plan [Member]
Supplemental Unemployment Benefits, Severance Benefits				800,000	800,000
Defined Benefit Plan, Assets for Plan Benefits				$ 700,000	700,000
Defined Contribution Plan, Employer Contribution Related to Severances, Amount					$ 100,000	$ 100,000	$ 100,000
Restricted Stock Units (RSUs) [Member]
Shares Paid for Tax Withholding for Share Based Compensation | shares					85,465	42,654	34,356
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					3 years
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
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares		1,402,612		1,638,618	1,638,618	1,402,612	1,313,915		468,507
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares		$ 7.53		$ 7.64	$ 7.64	$ 7.53	$ 4.91		$ 5.78
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares					1,057,944	1,165,832	1,157,127
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value					$ 5,600,000	$ 4,800,000	$ 1,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options				$ 9,800,000	$ 9,800,000
Restricted Stock [Member]
Share to RSU Reduction Ratio					1
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period					10 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares							44,189
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares							$ 8.75
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options		$ 0		$ 0	$ 0	$ 0
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					1 year
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					5 years
Performance-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares		299,971
The 2015 Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance | shares				3,000,000	3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares				1,914,637	1,914,637
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | shares					2,380,734
Prior Plans [Member]
Common Stock, Capital Shares Reserved for Future Issuance | shares				5,000,000	5,000,000
New ESPP [Member]
Common Stock, Capital Shares Reserved for Future Issuance | shares				3,500,000	3,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares				2,921,747	2,921,747
Share Price | $ / shares		$ 5.37		$ 5.23	$ 5.23	$ 5.37	$ 3.89
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	15.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount	$ 25,000
Defined Contribution Plan, Cost of Stock as a Percent of Fair Market Value	85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | shares					486,131	92,122	626,966
Common Stock, Excess Amount of Capital Shares Issued over Capital Shares Reserved for Future Issuance | shares						315,810
Purchase Plan 2010 [Member]
Common Stock, Capital Shares Reserved for Future Issuance | shares				2,500,000	2,500,000
Share Price | $ / shares								$ 3.89
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares					42,684
Costs Contingent on Rescission				$ 400,000
Purchase Plan 2010 [Member] | Accrued Compensation and Related Benefits [Member]
Income Tax Contingency, ESPP, Shares Issued in Excess of Reserve				$ 300,000	$ 300,000
Purchase Plan 2015 and 2010 [Member]
Allocated Share-based Compensation Expense					$ 1,000,000	$ 200,000	$ 800,000

Note 12 - Equity Incentive Pl66

Note 12 - Equity Incentive Plans and Employee Benefits - Stock Option Activities and Balances of Stock Option Plans (Details) - USD ($)	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014	Jan. 28, 2017	Jan. 30, 2016
Options Outstanding (in shares)	2,933,671	3,768,058	4,094,621
Options Outstanding (in dollars per share)	$ 11.57	$ 10.86	$ 11.24
Options Outstanding (Year)	4 years 182 days	4 years 73 days	4 years 328 days	4 years 292 days
Granted (in shares)	483,400	104,200	467,400
Granted (in dollars per share)	$ 6.87	$ 8.74	$ 4.54
Cancelled (in shares)	(556,616)	(415,146)	(734,702)
Cancelled (in dollars per share)	$ 11.41	$ 10.39	$ 9.52
Exercised (in shares)	(194,884)	(523,441)	(59,261)
Exercised (in dollars per share)	$ 4.75	$ 6.83	$ 4.59
Options Outstanding (in shares)	2,933,671	3,768,058	4,094,621	4,094,621	2,665,571	2,933,671
Options Outstanding (in dollars per share)	$ 11.57	$ 10.86	$ 11.24		$ 11.25	$ 11.57
Options Outstanding (in shares)	2,665,571	2,933,671	3,768,058	4,094,621
Aggregate Intrinsic Value					$ 566,742
Ending vested and expected to vest (in shares)					2,621,451
Ending vested and expected to vest (in dollars per share)					$ 11.33
Ending vested and expected to vest (Year)	4 years 146 days
Ending vested and expected to vest					$ 565,667
Ending exercisable (in shares)					2,131,470
Ending exercisable (in dollars per share)					$ 12.35
Ending exercisable (Year)	3 years 109 days
Ending exercisable					$ 513,643

Note 12 - Equity Incentive Pl67

Note 12 - Equity Incentive Plans and Employee Benefits - Stock Option Activities and Balances of Stock Option Plans (Details) (Parentheticals) - $ / shares	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Weighted average fair value (in dollars per share)	$ 3.14	$ 3.64	$ 1.80

Note 12 - Equity Incentive Pl68

Note 12 - Equity Incentive Plans and Employee Benefits - Stock Options by Exercise Prices Range (Details)	12 Months Ended
	Jan. 28, 2017$ / sharesshares
Range of exercise prices, upper limit (in dollars per share)
Number of options outstanding (in shares) | shares	2,665,571
Number of options outstanding, weighted average remaining contractual term (Year)	4 years 175 days
Number of options outstanding, weighted average exercise price (in dollars per share)	$ 11.25
Number of options exercisable (in shares) | shares	2,131,470
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 12.35
Exercise Price Range One [Member]
Range of exercise prices, lower limit (in dollars per share)	0.92
Range of exercise prices, upper limit (in dollars per share)	$ 4.98
Number of options outstanding (in shares) | shares	297,053
Number of options outstanding, weighted average remaining contractual term (Year)	6 years 346 days
Number of options outstanding, weighted average exercise price (in dollars per share)	$ 4.60
Number of options exercisable (in shares) | shares	260,579
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 4.55
Exercise Price Range Two [Member]
Range of exercise prices, lower limit (in dollars per share)	5.76
Range of exercise prices, upper limit (in dollars per share)	$ 6.48
Number of options outstanding (in shares) | shares	335,539
Number of options outstanding, weighted average remaining contractual term (Year)	8 years 124 days
Number of options outstanding, weighted average exercise price (in dollars per share)	$ 6.36
Number of options exercisable (in shares) | shares	95,155
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 6.08
Exercise Price Range Three [Member]
Range of exercise prices, lower limit (in dollars per share)	6.49
Range of exercise prices, upper limit (in dollars per share)	$ 7.30
Number of options outstanding (in shares) | shares	294,240
Number of options outstanding, weighted average remaining contractual term (Year)	7 years 204 days
Number of options outstanding, weighted average exercise price (in dollars per share)	$ 6.80
Number of options exercisable (in shares) | shares	171,982
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 6.60
Exercise Price Range Four [Member]
Range of exercise prices, lower limit (in dollars per share)	7.44
Range of exercise prices, upper limit (in dollars per share)	$ 10.51
Number of options outstanding (in shares) | shares	209,083
Number of options outstanding, weighted average remaining contractual term (Year)	7 years 105 days
Number of options outstanding, weighted average exercise price (in dollars per share)	$ 8.39
Number of options exercisable (in shares) | shares	74,098
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 9.28
Exercise Price Range Five [Member]
Range of exercise prices, lower limit (in dollars per share)	10.59
Range of exercise prices, upper limit (in dollars per share)	$ 10.59
Number of options outstanding (in shares) | shares	318,700
Number of options outstanding, weighted average remaining contractual term (Year)	2 years 354 days
Number of options outstanding, weighted average exercise price (in dollars per share)	$ 10.59
Number of options exercisable (in shares) | shares	318,700
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 10.59
Exercise Price Range Six [Member]
Range of exercise prices, lower limit (in dollars per share)	10.87
Range of exercise prices, upper limit (in dollars per share)	$ 10.87
Number of options outstanding (in shares) | shares	300,600
Number of options outstanding, weighted average remaining contractual term (Year)	1 year 270 days
Number of options outstanding, weighted average exercise price (in dollars per share)	$ 10.87
Number of options exercisable (in shares) | shares	300,600
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 10.87
Exercise Price Range Seven [Member]
Range of exercise prices, lower limit (in dollars per share)	11.07
Range of exercise prices, upper limit (in dollars per share)	$ 11.09
Number of options outstanding (in shares) | shares	353,934
Number of options outstanding, weighted average remaining contractual term (Year)	2 years 142 days
Number of options outstanding, weighted average exercise price (in dollars per share)	$ 11.08
Number of options exercisable (in shares) | shares	353,934
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 11.08
Exercise Price Range Eight [Member]
Range of exercise prices, lower limit (in dollars per share)	11.47
Range of exercise prices, upper limit (in dollars per share)	$ 15.25
Number of options outstanding (in shares) | shares	348,422
Number of options outstanding, weighted average remaining contractual term (Year)	2 years 54 days
Number of options outstanding, weighted average exercise price (in dollars per share)	$ 13.23
Number of options exercisable (in shares) | shares	348,422
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 13.23
Exercise Price Range Nine [Member]
Range of exercise prices, lower limit (in dollars per share)	15.64
Range of exercise prices, upper limit (in dollars per share)	$ 41.58
Number of options outstanding (in shares) | shares	164,000
Number of options outstanding, weighted average remaining contractual term (Year)	1 year 105 days
Number of options outstanding, weighted average exercise price (in dollars per share)	$ 33.83
Number of options exercisable (in shares) | shares	164,000
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 33.83
Exercise Price Range Ten [Member]
Range of exercise prices, lower limit (in dollars per share)	45.83
Range of exercise prices, upper limit (in dollars per share)	$ 45.83
Number of options outstanding (in shares) | shares	44,000
Number of options outstanding, weighted average remaining contractual term (Year)	281 days
Number of options outstanding, weighted average exercise price (in dollars per share)	$ 45.83
Number of options exercisable (in shares) | shares	44,000
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 45.83

Note 12 - Equity Incentive Pl69

Note 12 - Equity Incentive Plans and Employee Benefits - Restricted Stock Units Activities (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
Outstanding (in shares)	1,402,612	1,313,915	468,507
Outstanding, weighted average grant date fair value (in dollars per share)	$ 7.53	$ 4.91	$ 5.78
Outstanding, aggregate intrinsic value	$ 10,487,155	$ 9,299,318	$ 8,356,499	$ 2,197,298
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,057,944	1,165,832	1,157,127
Granted, weighted average grant date fair value (in dollars per share)	$ 7.42	$ 8.74	$ 4.91
Vested (in shares)	(783,909)	(861,259)	(257,315)
Vested, weighted average grant date fair value (in dollars per share)	$ 7.13	$ 5.52	$ 6.22
Cancelled/forfeited (in shares)	(38,029)	(215,876)	(54,404)
Cancelled/forfeited, weighted average grant date fair value (in dollars per share)	$ 7.67	$ 7.37	$ 6.09
Outstanding (in shares)	1,638,618	1,402,612	1,313,915
Outstanding, weighted average grant date fair value (in dollars per share)	$ 7.64	$ 7.53	$ 4.91

Note 12 - Equity Incentive Pl70

Note 12 - Equity Incentive Plans and Employee Benefits - Black-scholes Option Valuation Model Assumptions (Details) - $ / shares	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Weighted average fair value (in dollars per share)	$ 3.14	$ 3.64	$ 1.80
Employee Stock Option [Member]
Expected volatility	50.77%	44.84%	42.72%
Risk-free interest rate	1.27%	1.60%	1.63%
Expected term (in years) (Year)	5 years 83 days	5 years 69 days	5 years 40 days
Dividend yield	0.00%	0.00%	0.00%
Weighted average fair value (in dollars per share)	$ 3.14	$ 3.64	$ 1.80
Employee Stock Purchase Plan [Member]
Expected volatility	57.19%	77.90%	50.05%
Risk-free interest rate	0.50%	0.44%	0.08%
Expected term (in years) (Year)	182 days	167 days	182 days
Dividend yield	0.00%	0.00%	0.00%
Weighted average fair value (in dollars per share)	$ 1.91	$ 2.24	$ 1.67

Note 12 - Equity Incentive Pl71

Note 12 - Equity Incentive Plans and Employee Benefits - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Allocated Share-based Compensation Expense	$ 6,505	$ 6,559	$ 6,279
Cost of Sales [Member]
Allocated Share-based Compensation Expense	294	227	190
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	3,452	3,241	3,147
Selling and Marketing Expense [Member]
Allocated Share-based Compensation Expense	1,197	1,151	979
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	$ 1,562	$ 1,940	$ 1,963

Note 12 - Equity Incentive Pl72

Note 12 - Equity Incentive Plans and Employee Benefits - Shares Reserved for Future Issuance (Details) - shares	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	4,836,384
Options Outstanding (in shares)	2,665,571	2,933,671	3,768,058	4,094,621
Shares reserved for future issuance (in shares)	9,140,573
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,638,618	1,402,612	1,313,915	468,507

Note 13 - Income Taxes (Details

Note 13 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 3.5
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	16.1
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	3.4
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	14.9
Increase (Decrease) In Income Tax Penalties and Interest Accrued	0.5	$ 0.1
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0.8	0.3
Undistributed Earnings of Foreign Subsidiaries	$ 78.9
Number of Years Exempt from Tax on Income	2 years
Earliest Tax Year [Member]
Open Tax Year	1,991
Latest Tax Year [Member]
Open Tax Year	2,017
Maximum [Member]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 0.1
Number of Years Subject to Reduced Corporate Tax Rate	8 years
Minimum [Member]
Number of Years Subject to Reduced Corporate Tax Rate	5 years
Domestic Tax Authority [Member]
Operating Loss Carryforwards	$ 45.8
Deferred Tax Assets, Tax Credit Carryforwards, Research		12
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	20.8
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	38.3
Deferred Tax Assets, Tax Credit Carryforwards, Research		2.3
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	21.5
Foreign Tax Authority [Member]
Operating Loss Carryforwards	12.1
Israel [Member]
Income Tax Holiday, Aggregate Dollar Amount	$ 2.9	$ 4.1	$ 6.1
Income Tax Holiday, Income Tax Benefits Per Share	$ 0.08	$ 0.11	$ 0.18

Note 13 - Income Taxes - Net In

Note 13 - Income Taxes - Net Income (Loss) before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
United States	$ (13,465)	$ (23,129)	$ 1,641
International	1,797	30,478	(18,349)
Total	$ (11,668)	$ 7,349	$ (16,708)

Note 13 - Income Taxes - Compon

Note 13 - Income Taxes - Components of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Current
Federal	$ 290	$ (150)	$ (586)
State	111	45	73
Foreign	5,990	4,915	5,164
Total current	6,391	4,810	4,651
Deferred:
Federal		(290)
Foreign	256	2,671	342
Total deferred	256	2,381	342
Provision for income taxes	$ 6,647	$ 7,191	$ 4,993

Note 13 - Income Taxes - Deferr

Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Deferred tax assets:
Net operating loss	$ 11,196	$ 7,593
Investment impairment	545	1,131
Allowance, reserve and other	4,552	4,039
Depreciation	212	419
Tax credits	14,790	12,194
Stock-based compensation	6,636	8,420
Total gross deferred tax assets	37,931	33,796
Valuation allowance	(35,073)	(31,529)
Total deferred tax assets	2,858	2,267
Deferred tax liabilities:
Unrealized foreign exchange loss	(594)	(60)
Acquired intangibles and other	(1,926)	(1,613)
Net deferred tax assets	$ 338	$ 594

Note 13 - Income Taxes - Net Op

Note 13 - Income Taxes - Net Operating Losses and Tax Credit Carryforwards (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Net operating loss	$ 11,196	$ 7,593
Tax credits	14,790	$ 12,194
Domestic Tax Authority [Member]
Net operating loss	45,783
Tax credits	23,321
State and Local Jurisdiction [Member]
Net operating loss	38,281
Tax credits	21,532
Foreign Tax Authority [Member]
Net operating loss	$ 12,133

Note 13 - Income Taxes - Reconc

Note 13 - Income Taxes - Reconciliation of Income Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Computed at federal statutory rate of 35%	$ (4,084)	$ 2,572	$ (5,848)
State taxes provision, net of federal benefit	72	29	47
Uncertain tax positions	4,401	3,778	(347)
Difference between statutory rate and foreign effective tax rate	1,399	(1,474)	12,252
Stock-based compensation expense	423	(17)	819
Change in federal valuation allowance	5,542	4,098	(835)
Tax credits	(1,171)	(1,708)	(1,563)
Other	65	(87)	468
Provision for income taxes	$ 6,647	$ 7,191	$ 4,993

Note 13 - Income Taxes - Reco79

Note 13 - Income Taxes - Reconciliation of Income Tax Benefit (Details) (Parentheticals)	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Federal statutory rate	35.00%	35.00%	35.00%

Note 13 - Income Taxes - Change

Note 13 - Income Taxes - Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Beginning balance	$ 22,172	$ 15,504	$ 17,439
Additions based on tax positions related to the current year	5,549	5,449	1,373
Additions for tax positions of prior years	1,900	1,527	718
Reductions for tax positions of prior year			(61)
Lapse of statute of limitation	(1,436)	(308)	(3,965)
Ending balance	$ 28,185	$ 22,172	$ 15,504

Note 14 - Segment and Geograp81

Note 14 - Segment and Geographical Information (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Number of Reportable Segments	1
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Arrow Electronics [Member]
Concentration Risk, Percentage	10.00%
IoT Devices [Member]
Revenue Recognition, Milestone Method, Revenue Recognized	$ 5
License and Other [Member]
Percentage of Revenue During Period	0.10%	0.00%	3.00%

Note 14 - Segment and Geograp82

Note 14 - Segment and Geographical Information - Net Revenue and Gross Profit by Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Sales revenue, net	$ 42,724	$ 62,729	$ 61,316	$ 53,775	$ 51,450	$ 61,581	$ 58,307	$ 55,912	$ 220,544	$ 227,250	$ 188,313
Connected Smart TV Platforms [Member]
Sales revenue, net									175,085	180,360	151,775
IoT Devices [Member]
Sales revenue, net									45,159	46,792	30,667
License and Other [Member]
Sales revenue, net									$ 300	$ 98	$ 5,871

Note 14 - Segment and Geograp83

Note 14 - Segment and Geographical Information - Net Revenue Based on the Ship-to Location (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Net revenue	$ 42,724	$ 62,729	$ 61,316	$ 53,775	$ 51,450	$ 61,581	$ 58,307	$ 55,912	$ 220,544	$ 227,250	$ 188,313
Asia [Member]
Net revenue									180,104	172,773	152,571
North America [Member]
Net revenue									32,732	42,335	20,746
Europe [Member]
Net revenue									7,692	10,292	12,012
Other Regions [Member]
Net revenue									$ 16	$ 1,850	$ 2,984

Note 14 - Segment and Geograp84

Note 14 - Segment and Geographical Information - Net Revenue to Each Significant Country Based on the Ship-to Location (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Sales revenue, net	$ 42,724	$ 62,729	$ 61,316	$ 53,775	$ 51,450	$ 61,581	$ 58,307	$ 55,912	$ 220,544	$ 227,250	$ 188,313
CHINA
Sales revenue, net									110,195	93,560	70,513
TAIWAN, PROVINCE OF CHINA
Sales revenue, net									51,093	50,301	24,346
UNITED STATES
Sales revenue, net									32,367	41,781	20,587
THAILAND
Sales revenue, net									9,487	13,532	40,703
Rest of the World [Member]
Sales revenue, net									$ 17,402	$ 28,076	$ 32,164

Note 14 - Segment and Geograp85

Note 14 - Segment and Geographical Information - Long-Lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Long-lived assets	$ 18,523	$ 14,086
UNITED STATES
Long-lived assets	11,923	5,885
SINGAPORE
Long-lived assets	3,917	5,388
All Other Countries [Member]
Long-lived assets	$ 2,683	$ 2,813

Note 14 Segment and Geographica

Note 14 Segment and Geographical Information - Major Customers (Details) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Jan. 28, 2017		Jan. 30, 2016		Jan. 31, 2015
Sunjet Components Corporation [Member]
Concentration Risk, Percentage	20.00%		16.00%			[1]
Silicon Application [Member]
Concentration Risk, Percentage	13.00%			[1]		[1]
Arris Global [Member]
Concentration Risk, Percentage	14.00%			[1]		[1]
Benchmark Electronics [Member]
Concentration Risk, Percentage		[1]		[1]	13.00%
[1]	Accounted for less than 10% of our net revenue.

Note 15 - Collaborative Arran87

Note 15 - Collaborative Arrangement (Details Textual) - USD ($) $ in Thousands	Feb. 06, 2017	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015	Sep. 30, 2016
Research and Development Expense		$ 73,993	$ 68,784	$ 67,482
Collaborative Arrangement, Product [Member] | Telechips Inc [Member]
Marketing Service Fee as a Percentage of Net Profit from Collaborative Agreement					50.00%
Net Loss from Collaborative Arrangement		300
Research and Development Expense		$ 0
Collaborative Arrangement, Product [Member] | Telechips Inc [Member] | Subsequent Event [Member] | Mask Sets [Member]
Payments to Acquire Products Under Collaborative Arrangement	$ 2,500
Products Acquired Under Collaborative Arrangement, Amortization Period	3 years

Note 16 - Quarterly Financial88

Note 16 - Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Sales revenue, net	$ 42,724	$ 62,729	$ 61,316	$ 53,775	$ 51,450	$ 61,581	$ 58,307	$ 55,912	$ 220,544		$ 227,250	$ 188,313
Gross profit	21,401	30,995	29,582	24,001	24,501	30,787	28,524	29,348	105,979		113,160	95,346
(Loss) income from operations	(7,163)	2,169	(313)	(6,015)	(5,237)	1,464	1,208	1,410	(11,322)		(1,155)	(17,877)
Net loss	$ (8,716)	$ 221	$ (1,722)	$ (8,098)	$ (6,191)	$ 6,435	$ 296	$ (382)	$ (18,315)	$ (18,315)	$ 158	$ (21,701)
Basic net (loss) income per share (in dollars per share)	$ (0.23)	$ 0.01	$ (0.05)	$ (0.22)	$ (0.17)	$ 0.18	$ 0.01	$ (0.01)	$ (0.49)		$ 0	$ (0.63)
Diluted net (loss) income per share (in dollars per share)	$ (0.23)	$ 0.01	$ (0.05)	$ (0.22)	$ (0.17)	$ 0.17	$ 0.01	$ (0.01)	$ (0.49)		$ 0	$ (0.63)

Schedule II - Valuation and Q89

Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Balance at beginning of period	$ 2,002	$ 1,502	$ 300
Additions: provision for (recovery of)	(372)	692	1,257
Deductions: (write-offs) recoveries of		(192)	(55)
Balance at end of period	$ 1,630	$ 2,002	$ 1,502

Uncategorized Items - sigm-2017

Label	Element	Value
Net share settlement of equity awards	us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	$ (635,000)
us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6,505,000
us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(336,000)
us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation	us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation	3,489,000
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Net share settlement of equity awards	us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Change in unrealized gains (losses) on marketable securities, net of tax	us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	$ (336,000)
Treasury Stock [Member]
us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation	us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Net share settlement of equity awards	us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Change in unrealized gains (losses) on marketable securities, net of tax	us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Retained Earnings [Member]
Net (loss) income	us-gaap_NetIncomeLoss	(18,315,000)
Net share settlement of equity awards	us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Change in unrealized gains (losses) on marketable securities, net of tax	us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Common Stock [Member]
us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation	us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation	1,381,902
Net share settlement of equity awards	us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	$ (635,000)
Change in unrealized gains (losses) on marketable securities, net of tax	us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6,505,000
us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation	us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation	3,489,000
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Net share settlement of equity awards	us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Change in unrealized gains (losses) on marketable securities, net of tax	us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	$ 33,000