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Line of Credit and Debt Obligations - Textual (Details) (USD $)
0 Months Ended
May 30, 2014
Mar. 28, 2015
May 30, 2014
Line of Credit and Debt Obligations (Textual) [Abstract]      
Maturity date May 30, 2016    
Line of Credit Facility, Maximum Borrowing Capacity $ 12,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity   $ 12,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Borrowing interest rate 3.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd   3.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Borrowing, minimum of lesser amount, before addition of borrowing base 12,000,000nano_LineOfCreditFacilityStandardBorrowingLimitUnderConditionOne   12,000,000nano_LineOfCreditFacilityStandardBorrowingLimitUnderConditionOne
Borrowing, maximum of lesser amount 20,000,000nano_LineOfCreditFacilityBorrowingLimitUnderConditionTwo   20,000,000nano_LineOfCreditFacilityBorrowingLimitUnderConditionTwo
Total borrowing available   16,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity  
Revolving line of credit facility [Member]      
Line of Credit and Debt Obligations (Textual) [Abstract]      
Extension of maturity period on amendment of existing credit facility 2 years    
Revolving line of credit facility [Member] | Line of Credit [Member]      
Line of Credit and Debt Obligations (Textual) [Abstract]      
Amount outstanding   $ 0us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember