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Income Taxes (Narrative) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Feb. 02, 2020 | Feb. 03, 2019 | Jan. 28, 2018 | Dec. 31, 2017 | Jan. 29, 2017
U.S. corporate income tax | 21.00% | 21.00% | 21.00% | 33.90% | 35.00% |
Income tax benefit due to 2017 Tax Act from remeasuring of deferred tax assets and liabilities |  |  |  | $ 1,500,000 |  |
Research and development tax credits |  |  | $ 400,000 | 200,000 |  | $ 100,000
Tax expense for interest or penalties |  | $ 0 | 0 | $ 0 |  |
Unrecognized tax benefits |  | $ 0 | $ 0 |  |  |
Tax Cuts And Jobs Act [Member] |  |  |  |  |  |
U.S. corporate income tax |  |  |  | 33.90% |  |
Federal [Member] | Tax Year 2016 [Member] |  |  |  |  |  |
Tax years open for tax examination |  | 2016 |  |  |  |
State [Member] | Tax Year 2015 [Member] |  |  |  |  |  |
Tax years open for tax examination |  | 2015 |  |  |  |

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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of reasonable estimate for income tax benefit for which accounting for tax effect for remeasurement of deferred tax liability from change in tax rate is incomplete pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2A -Subparagraph (SAB Topic 5.EE.Q2(b)) -URI http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817 + Details
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