The following is a summary of our investments at December 31, 2023: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Amortized
Cost | | Gross
Unrealized
Gains | | Gross
Unrealized
Losses | | Estimated
Fair
Value | | | | (In thousands) | Equity securities | | | | | | | | | | | | | | | | | | Mutual funds | | $ | 7,002 | | | $ | 711 | | | $ | — | | | $ | 7,713 | | Available-for-sale securities | | | | | | | | | Corporate bonds | | 1,479 | | | 304 | | | — | | | 1,783 | | Total | | $ | 8,481 | | | $ | 1,015 | | | $ | — | | | $ | 9,496 | |
The following is a summary of our investments at December 31, 2022: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Amortized
Cost | | Gross
Unrealized
Gains | | Gross
Unrealized
Losses | | Estimated
Fair
Value | | | | (In thousands) | Equity securities | | | | | | | | | | | | | | | | | | Mutual funds | | $ | 6,352 | | | $ | — | | | $ | (11) | | | $ | 6,341 | | Available-for-sale securities | | | | | | | | | U.S. Government and agency securities | | 3,247 | | | 10 | | | (4) | | | 3,253 | | Corporate bonds | | 2,033 | | | 236 | | | (4) | | | 2,265 | | Asset-backed securities and collateralized mortgage obligations | | 103 | | | — | | | (61) | | | 42 | | Total | | $ | 11,735 | | | $ | 246 | | | $ | (80) | | | $ | 11,901 | |
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