v2.4.0.6

Accounts Receivable (Details Textual) (USD $) | 12 Months Ended
--- | ---
Dec. 29, 2012 | Dec. 31, 2011
Accounts Receivable (Additional Textual) [Abstract] |  |
Sold receivables amount | $ 6,700,000 | $ 19,600,000
Gains or losses on sale of accounts receivables | 0 | 0
Due from unrelated third parties | $ 0 | $ 0
Minimum [Member] |  |
Accounts Receivable (Textual) [Abstract] |  |
Administrative fees as well as interest percent | 1.23% |
Maximum [Member] |  |
Accounts Receivable (Textual) [Abstract] |  |
Administrative fees as well as interest percent | 1.68% |

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- Details
Name: | nano_AccountsReceivableAdditionalTextualAbstract
Namespace Prefix: | nano_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | nano_AccountsReceivableTextualAbstract
Namespace Prefix: | nano_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Administrative fees and interest percent. + References No definition available. + Details
Name: | nano_AdministrativeFeesAndInterestPercent
Namespace Prefix: | nano_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Due from unrelated third parties. + References No definition available. + Details
Name: | nano_DueFromUnrelatedThirdParties
Namespace Prefix: | nano_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Proceeds from accounts receivable. + References No definition available. + Details
Name: | nano_ProceedsFromAccountsReceivable
Namespace Prefix: | nano_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reflects the net positive or negative amount derived from subtracting from net proceeds of sale, the carrying amounts, net of allocated reserves, of accounts receivable transferred to a third party in a transaction that qualifies for sales treatment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107425-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_GainLossOnSaleOfAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration