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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) |  | 6 Months Ended
--- | --- | ---
Jan. 18, 2022 | Jun. 30, 2022 | Jun. 30, 2021
Proceeds from Issuance of Common Stock |  | $ 49,440,000 | $ 0
Percentage of Qualified Wages, Tax Credit |  | 70.00% |
Qualified Wages per Employee |  | $ 10,000 |
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) | $ 10.00 |  |
Proceeds from Issuance of Common Stock | $ 53,000,000.0 |  |
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 |  |

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