XML 76 R66.htm IDEA: XBRL DOCUMENT v3.25.3

Commitments and Contingencies - Litigation, etc. (Details)	3 Months Ended
	Sep. 30, 2025 USD ($) M agreement
Loss Contingencies
Number of employment agreement | agreement	2
Number of severance agreement | agreement	1
CEO
Loss Contingencies
Annual salary commitment | $	$ 1,019,000
Termination pay commitment rate applied to the average of the prior five calendar years compensation	299.00%
Minimum number of months either party gives the other notice of non-renewal	6
EVP of Engineering
Loss Contingencies
Annual salary commitment | $	$ 476,000
Number of months of salary if terminated by the company without cause	9
Number of months of health insurance terminated benefit	6
President and CFO
Loss Contingencies
Number of months of salary if terminated by the company without cause	9
Number of months of health insurance terminated benefit	6

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

- Definition

The rate applied to the most recent 5-year average of annual salaries, as defined, to calculate termination pay the entity has committed to pay under specified circumstances.

+ References

No definition available.

+ Details

Name:	nssc_CommitmentTerminationPay
Namespace Prefix:	nssc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of employment agreement.

+ References

No definition available.

+ Details

Name:	nssc_NumberOfEmploymentAgreement
Namespace Prefix:	nssc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Minimum number of months either party gives the other notice of non-renewal at prior to the end of the applicable term.

+ References

No definition available.

+ Details

Name:	nssc_NumberOfMonthsNoticeForNonRenewalEmploymentAgreement
Namespace Prefix:	nssc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of months of health insurance that employers owe employees when their employment ends through a layoff or other termination without cause.

+ References

No definition available.

+ Details

Name:	nssc_NumberOfMonthsSeveranceBenefitOfHealthInsurance
Namespace Prefix:	nssc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of months of wages that employers owe employees when their employment ends through a layoff or other termination without cause.

+ References

No definition available.

+ Details

Name:	nssc_NumberOfMonthsSeveranceBenefitOfSalary
Namespace Prefix:	nssc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of severance agreement.

+ References

No definition available.

+ Details

Name:	nssc_NumberOfSeveranceAgreement
Namespace Prefix:	nssc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 720
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483359/720-20-50-1

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 27
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482395/460-10-55-27

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-3

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

+ Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_TitleOfIndividualAxis=nssc_VicePresidentOfEngineeringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_TitleOfIndividualAxis=nssc_PresidentAndChiefFinancialOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: