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Accounts Receivable (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2013 | Jun. 30, 2012 | Jun. 29, 2013 | Jun. 30, 2012 | Dec. 29, 2012
Accounts Receivable (Additional Textual) [Abstract] |  |  |  |  |
Sold receivables amount | $ 3,200,000 | $ 2,100,000 | $ 4,600,000 | $ 3,600,000 |
Due from unrelated third parties | $ 0 |  | $ 0 |  | $ 0
Minimum [Member] |  |  |  |  |
Accounts Receivable (Textual) [Abstract] |  |  |  |  |
Administrative fees as well as interest percent |  |  | 1.21% |  |
Maximum [Member] |  |  |  |  |
Accounts Receivable (Textual) [Abstract] |  |  |  |  |
Administrative fees as well as interest percent |  |  | 1.475% |  |

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- Details
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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
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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