Note 4 - Related Party Transactions (Details Textual) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Loans and Leases Receivable, Related Parties | $ 9,441,000 | $ 10,460,000 | $ 11,479,000 |
| Related Party Deposit Liabilities | 11,000,000 | 7,100,000 | |
| Payments to Fund Long-Term Loans to Related Parties | 12,100 | 22,600 | |
| Unused lines of Credit [Member] | |||
| Loans and Leases Receivable, Related Parties | 558,000 | 558,000 | |
| Letter of Credit [Member] | |||
| Loans and Leases Receivable, Related Parties | $ 15,800 | $ 15,800 | |