XML 72 R62.htm IDEA: XBRL DOCUMENT v3.25.3

Stockholders' Equity Transactions - Shares repurchased (Details) - $ / shares		1 Months Ended		3 Months Ended			9 Months Ended
	Sep. 19, 2024	Mar. 20, 2025	Dec. 19, 2024	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Mar. 31, 2025	Sep. 30, 2025
Stockholders' Equity Transactions
Total Number of Shares Purchased	193,252	745,000	282,647	745,000	282,647	193,252	1,220,899
Average Price Paid per Share	$ 37.67	$ 25.22	$ 37.95	$ 25.22	$ 37.95	$ 37.67	$ 30.14
Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	193,252	745,000	282,647				1,220,899
Maximum Number of Shares that May Yet Be Purchased Under Plans or Programs	1,387,388	359,741	1,104,741	359,741			359,741	359,741

X

- Definition

Number of shares that have been repurchased as part of publicly announced plans or programs during the period and are being held in treasury.

+ References

No definition available.

+ Details

Name:	nssc_ShareRepurchaseProgramNumberOfSharesPurchasedAsPartOfPubliclyAnnouncedPlansOrPrograms
Namespace Prefix:	nssc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Number of shares remaining authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481549/505-30-45-1

+ Details

Name:	us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration