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Note H - Segment Information - Net Sales by Geographic Region (Details) (USD $)
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Revenue, Net $ 18,618,000us-gaap_SalesRevenueNet $ 16,475,000us-gaap_SalesRevenueNet $ 37,313,000us-gaap_SalesRevenueNet $ 33,630,000us-gaap_SalesRevenueNet
UNITED STATES        
Revenue, Net 9,373,000us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		 8,215,000us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		 19,084,000us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		 17,702,000us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
Markets Outside the United States [Member]        
Revenue, Net $ 9,245,000us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= naii_MarketsOutsideTheUnitedStatesMember		 $ 8,260,000us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= naii_MarketsOutsideTheUnitedStatesMember		 $ 18,229,000us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= naii_MarketsOutsideTheUnitedStatesMember		 $ 15,928,000us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= naii_MarketsOutsideTheUnitedStatesMember