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Note 9 - Commitments and Contingencies (Details Textual) | Mar. 31, 2024
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First Mortgage Loans [Member] | One To Four Family Residential [Member] |
Financing Receivable, Minimum Percentage of Loan-to-value Ratio, Requires Mortgage Insurance | 80.00%

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- 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: |