Annual report pursuant to Section 13 and 15(d)

Note 1 - Summary of Significant Accounting Policies (Details Textual)

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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 12 Months Ended 24 Months Ended
Jan. 18, 2022
Mar. 30, 2023
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Proceeds from Issuance of Common Stock       $ 0 $ 49,440,000  
Percentage of Qualified Wages, Tax Credit       70.00%   70.00%
Qualified Wages per Employee       $ 10,000   $ 10,000
Proceeds from Employee Retention Tax Credit Receivable   $ 259,000        
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss       351,000   351,000
Federal Home Loan Bank Stock       550,000 550,000 550,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss       392,000   392,000
Unrecognized Tax Benefits, Ending Balance       $ 0 $ 0 $ 0
One To Four Family Residential [Member] | First Mortgage Loans [Member]            
Financing Receivable, Minimum Percentage of Loan-to-value Ratio, Requires Mortgage Insurance       80.00%   80.00%
Multifamily and Commercial Real Estate [Member] | First Mortgage Loans [Member]            
Financing Receivable, Maximum Term (Year)           30 years
Financing Receivable, Maximum Loan-to-value Ratio       75.00%   75.00%
Construction Loans [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Minimum Percentage of Loan-to-value Ratio, Requires Mortgage Insurance       80.00%   80.00%
Non Interest Income [Member]            
Employee Retention Credit Amount     $ 503,000      
Subscription Offering [Member]            
Stock Issued During Period, Shares, New Issues (in shares) 5,290,000          
Shares Issued, Price Per Share (in dollars per share) $ 10          
Proceeds from Issuance of Common Stock $ 53,000,000          
Subscription Offering [Member] | NSTS Charitable Foundation [Member]            
Payments of Charitable Contributions $ 150,000          
Subscription Offering [Member] | NSTS Charitable Foundation [Member] | Contribution of Nonmonetary Assets to Charitable Organization [Member]            
Stock Issued During Period, Shares, New Issues (in shares) 107,959