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Note 10 - Commitments and Contingencies (Details Textual)	Jun. 30, 2022
First Mortgage Loans [Member] | One To Four Family Residential [Member]
Financing Receivable, Minimum Percentage of Loan-to-value Ratio, Requires Mortgage Insurance	80.00%

X

- Definition

The minimum percentage of loan-to-value ratio that requires mortgage insurance on financing receivable.

+ References

No definition available.

+ Details

Name:	nsts_FinancingReceivableMinimumPercentageOfLoantovalueRatioRequiresMortgageInsurance
Namespace Prefix:	nsts_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=nsts_FirstMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nsts_OneToFourFamilyResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: