Note 3 - Investments in Securities (Tables)
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6 Months Ended |
Jun. 30, 2025 |
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| Notes Tables |
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| Debt Securities, Held-to-Maturity [Table Text Block] |
| | | | | | | Gross | | | Gross | | | Allowance | | | | | |
| | | Amortized | | | Unrealized | | | Unrealized | | | for Credit | | | Fair | |
| Held-to-maturity: | | Cost | | | Gains | | | Losses | | | Losses | | | Value | |
| | | (in thousands) | |
| June 30, 2025 | | | | | | | | | | | | | | | | | | | | |
| Debt securities issued by U.S. government-sponsored enterprises | | $ | 5,589 | | | $ | — | | | $ | (34 | ) | | $ | — | | | $ | 5,555 | |
| Mortgage-backed securities | | | 41,859 | | | | 43 | | | | (4,092 | ) | | | — | | | | 37,810 | |
| Corporate bonds | | | 16,400 | | | | 140 | | | | (360 | ) | | | — | | | | 16,180 | |
| U.S. Treasury securities | | | 2,997 | | | | 5 | | | | — | | | | — | | | | 3,002 | |
| Total held-to-maturity securities | | $ | 66,845 | | | $ | 188 | | | $ | (4,486 | ) | | $ | — | | | $ | 62,547 | |
| | | | | | | | | | | | | | | | | | | | | |
| December 31, 2024 | | | | | | | | | | | | | | | | | | | | |
| Debt securities issued by U.S. government-sponsored enterprises | | $ | 5,588 | | | $ | — | | | $ | (138 | ) | | $ | — | | | $ | 5,450 | |
| Mortgage-backed securities | | | 44,261 | | | | 20 | | | | (5,334 | ) | | | — | | | | 38,947 | |
| Corporate bonds | | | 17,899 | | | | 192 | | | | (471 | ) | | | — | | | | 17,620 | |
| U.S. Treasury securities | | | 5,467 | | | | 21 | | | | — | | | | — | | | | 5,488 | |
| Total held-to-maturity securities | | $ | 73,215 | | | $ | 233 | | | $ | (5,943 | ) | | $ | — | | | $ | 67,505 | |
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| Debt Securities, Available-for-Sale [Table Text Block] |
| | | | | | | Gross | | | Gross | | | Allowance | | | | | |
| | | Amortized | | | Unrealized | | | Unrealized | | | for Credit | | | Fair | |
| Available-for-sale | | Cost | | | Gains | | | Losses | | | Losses | | | Value | |
| | | (in thousands) | |
| June 30, 2025 | | | | | | | | | | | | | | | | | | | | |
| Mortgage-backed securities | | $ | 6,548 | | | $ | 39 | | | $ | (10 | ) | | $ | — | | | $ | 6,577 | |
| Collateralized mortgage obligation | | | 2,992 | | | | — | | | | (25 | ) | | | — | | | | 2,967 | |
| Corporate bonds | | | 10,529 | | | | 10 | | | | (45 | ) | | | — | | | | 10,494 | |
| Total available-for-sale securities | | $ | 20,069 | | | $ | 49 | | | $ | (80 | ) | | $ | — | | | $ | 20,038 | |
| | | | | | | | | | | | | | | | | | | | | |
| December 31, 2024 | | | | | | | | | | | | | | | | | | | | |
| Mortgage-backed securities | | $ | 4,164 | | | $ | — | | | $ | (38 | ) | | $ | — | | | $ | 4,126 | |
| Collateralized mortgage obligation | | | 1,452 | | | | — | | | | (14 | ) | | | — | | | | 1,438 | |
| Corporate bonds | | | 1,000 | | | | — | | | | — | | | | — | | | | 1,000 | |
| Total available-for-sale securities | | $ | 6,616 | | | $ | — | | | $ | (52 | ) | | $ | — | | | $ | 6,564 | |
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| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
| | | | | | | Less than 12 Months | | | 12 Months or Longer | | | Total | |
| | | # of | | | Fair | | | Unrealized | | | Fair | | | Unrealized | | | Fair | | | Unrealized | |
| | | Holdings | | | Value | | | Losses | | | Value | | | Losses | | | Value | | | Losses | |
| | | | | | | | | | | | | | | (Dollars in thousands) | | | | | | | | | |
| June 30, 2025 | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Available-for-Sale: | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Mortgage-backed securities | | | 1 | | | $ | 1,365 | | | $ | (10 | ) | | $ | — | | | $ | — | | | $ | 1,365 | | | $ | (10 | ) |
| Collateralized mortgage obligation | | | 2 | | | | 2,967 | | | | (25 | ) | | | — | | | | — | | | | 2,967 | | | | (25 | ) |
| Corporate bonds | | | 2 | | | | 5,482 | | | | (45 | ) | | | — | | | | — | | | | 5,482 | | | | (45 | ) |
| Total | | | 5 | | | $ | 9,814 | | | $ | (80 | ) | | $ | — | | | $ | — | | | $ | 9,814 | | | $ | (80 | ) |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| December 31, 2024 | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Available-for-Sale: | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Mortgage-backed securities | | | 2 | | | $ | 4,126 | | | $ | (38 | ) | | $ | — | | | $ | — | | | $ | 4,126 | | | $ | (38 | ) |
| Collateralized mortgage obligation | | | 1 | | | | 1,438 | | | | (14 | ) | | | — | | | | — | | | | 1,438 | | | | (14 | ) |
| Total | | | 3 | | | $ | 5,564 | | | $ | (52 | ) | | $ | — | | | $ | — | | | $ | 5,564 | | | $ | (52 | ) |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
| | | Available-for-sale | | | Held-to-maturity | |
| | | Fair | | | Amortized | | | Fair | |
| | | Value | | | Cost | | | Value | |
| | | (in thousands) | |
| Within 1 year | | $ | — | | | $ | 14,317 | | | $ | 14,246 | |
| After 1 year through 5 years | | | 9,515 | | | | 14,407 | | | | 14,331 | |
| After 5 years through 10 years | | | 6,495 | | | | 5,736 | | | | 5,454 | |
| After 10 years | | | 4,028 | | | | 32,385 | | | | 28,516 | |
| Total | | $ | 20,038 | | | $ | 66,845 | | | $ | 62,547 | |
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