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Accounts Receivable - Textual (Details) (USD $)
 3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Dec. 27, 2014
Accounts Receivable (Additional Textual) [Abstract]      
Sold receivables amount $ 1,100,000nano_ProceedsFromAccountsReceivable $ 600,000nano_ProceedsFromAccountsReceivable  
Due from unrelated third parties $ 0nano_DueFromUnrelatedThirdParties   $ 0nano_DueFromUnrelatedThirdParties
Minimum [Member]      
Accounts Receivable (Textual) [Abstract]      
Administrative fees as well as interest percent 1.15%nano_AdministrativeFeesAndInterestPercent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum [Member]      
Accounts Receivable (Textual) [Abstract]      
Administrative fees as well as interest percent 1.68%nano_AdministrativeFeesAndInterestPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember