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Note H - Segment Information - Assets and Capital Expenditures by Geographical Region (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Long-Lived assets $ 8,471us-gaap_NoncurrentAssets   $ 8,811us-gaap_NoncurrentAssets
Assets 51,634us-gaap_Assets   52,258us-gaap_Assets
Capital Expenditures 925us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 1,673us-gaap_PaymentsToAcquirePropertyPlantAndEquipment  
Europe [Member]      
Long-Lived assets 1,980us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
  2,163us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Assets 17,696us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
  15,640us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Capital Expenditures 172us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
240us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
 
United States [Member]      
Long-Lived assets 6,491us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= naii_UnitedStatesMember
  6,648us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= naii_UnitedStatesMember
Assets 33,938us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= naii_UnitedStatesMember
  36,618us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= naii_UnitedStatesMember
Capital Expenditures $ 753us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementGeographicalAxis
= naii_UnitedStatesMember
$ 1,433us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementGeographicalAxis
= naii_UnitedStatesMember