Note 10 - Commitments and Contingencies (Details Textual)	Jun. 30, 2023
First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Financing Receivable, Minimum Percentage of Loan-to-value Ratio, Requires Mortgage Insurance	80.00%

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

No definition available.

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