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Commitments - Employment Agreements (Narrative) (Detail) (USD $) | 6 Months Ended
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Dec. 31, 2012 Item
Employee severance agreement [Member] |
Commitments Disclosure [Line Items] |
Number of agreements | 1
Employment contract [Member] |
Commitments Disclosure [Line Items] |
Number of agreements | 2
Employment contract [Member] | Chief executive officer [Member] |
Commitments Disclosure [Line Items] |
Annual salary commitment | 587,000
Termination pay commitment rate applied to the average of the prior five calendar years compensation | 299.00%
Employment contract [Member] | Senior Vice President of Sales and Marketing [Member] |
Commitments Disclosure [Line Items] |
Annual salary commitment | 274,400

X
- Definition The amount of salary the entity is obligated to pay each year pursuant to terms of one or more agreements with employees. + References No definition available. + Details
Name: | nssc_CommitmentAnnualSalary
Namespace Prefix: | nssc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | nssc_CommitmentsDisclosureLineItems
Namespace Prefix: | nssc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The rate applied to the most recent 5-year average of annual salaries, as defined, to calculate temination pay the entity has commited to pay under specified circumstances. + References No definition available. + Details
Name: | nssc_CommitmentTerminationPay
Namespace Prefix: | nssc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of contracts, agreements or arrangements in the disclosure as of a point in time. + References No definition available. + Details
Name: | nssc_NumberOfAgreements
Namespace Prefix: | nssc_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration