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Note M - Segment Information - Net Sales by Geographic Region (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014
UNITED STATES |  |
Net Sales | $ 43,671 | $ 38,729
Markets Outside the United States [Member] |  |
Net Sales | 35,837 | 35,213
Net Sales | $ 79,508 | $ 73,942

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=naii_MarketsOutsideTheUnitedStatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |