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Business Acquisition (Schedule of Assets Acquired and Liabilities Assumed) (Details) (Tech Ord [Member], USD $)
In Thousands, unless otherwise specified
Jan. 24, 2014
Tech Ord [Member]
 
Business Acquisition [Line Items]  
Receivables $ 1,498us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= npk_TechOrdMember
Inventory 4,688us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= npk_TechOrdMember
Other Current Assets 28us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= npk_TechOrdMember
Property, Plant and Equipment 4,800us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= npk_TechOrdMember
Total Assets Acquired 11,014us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= npk_TechOrdMember
Less: Current Liabilities Assumed 480us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= npk_TechOrdMember
Net Assets Acquired $ 10,534us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= npk_TechOrdMember