| Investments |
Note 4. Investments The amortized cost, unrealized gains and losses, fair value and maturities of our held-to-maturity investments at June 30, 2026 and December 31, 2025 are summarized as follows: | | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2026 | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value | | Commercial paper | $ | 4,960 | | | $ | — | | | $ | (3) | | | $ | 4,957 | | | | | | | | | | | | | | | | | | | Corporate bonds and notes | 114,259 | | | 196 | | | (178) | | | 114,277 | | | $ | 119,219 | | | $ | 196 | | | $ | (181) | | | $ | 119,234 | |
| | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2025 | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value | | Commercial paper | $ | 4,868 | | | $ | 1 | | | $ | — | | | $ | 4,869 | | | U.S. government agency bonds | 3,000 | | — | | | — | | | 3,000 | | State and municipal bonds | 1,000 | | — | | | — | | | 1,000 | | Corporate bonds and notes | 120,553 | | 492 | | | (17) | | | 121,028 | | $ | 129,421 | | | $ | 493 | | | $ | (17) | | | $ | 129,897 | |
| | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2026 | | December 31, 2025 | | Amortized Cost | | Fair Value | | Amortized Cost | | Fair Value | | Due in one year or less | $ | 51,011 | | | $ | 51,007 | | | $ | 69,427 | | | $ | 69,586 | | | Due after one year through five years | 68,208 | | | 68,227 | | | 59,994 | | | 60,311 | | | $ | 119,219 | | | $ | 119,234 | | | $ | 129,421 | | | $ | 129,897 | |
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