Note 3 - Investment Securities (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Mar. 31, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Proceeds from Sale of Debt Securities, Available-for-Sale | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | |
| Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | 1,500,000 | 1,500,000 | $ 1,600,000 | |||
| Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0 | 0 | 0 | ||
| Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | $ 0 | 0 | $ 0 | ||
| Asset Pledged as Collateral [Member] | ||||||
| Financial Instruments, Owned, at Fair Value | 44,800,000 | 44,800,000 | 48,700,000 | |||
| Asset Pledged as Collateral [Member] | Deposits [Member] | ||||||
| Financial Instruments, Owned, at Fair Value | $ 30,000 | $ 30,000 | $ 36,000 | |||