| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
| | | Fair Value Measurements Using | |
| June 30, 2026 | | Fair Value | | | Quoted Prices in Active
Markets For Identical Assets (Level 1) | | | Significant Other Observable Inputs (Level 2) | | | Significant Unobservable Inputs (Level 3) | |
| Cash and cash equivalents | | $ | 39,209 | | | $ | 39,209 | | | $ | – | | | $ | – | |
| Restricted cash and cash equivalents | | | 13,069 | | | | 13,069 | | | | – | | | | – | |
| Marketable equity securities | | | 190,378 | | | | 190,378 | | | | – | | | | – | |
| Corporate debt securities | | | 60,156 | | | | 44,528 | | | | 15,628 | | | | – | |
| Asset–backed securities | | | 15,971 | | | | – | | | | 15,971 | | | | – | |
| U.S. Treasury securities | | | 40,965 | | | | 40,965 | | | | – | | | | – | |
| State and municipal securities | | | 2,275 | | | | – | | | | 2,275 | | | | – | |
| Total financial assets | | $ | 362,023 | | | $ | 328,149 | | | $ | 33,874 | | | $ | – | |
| | | Fair Value Measurements Using | |
| December 31, 2025 | | Fair Value | | | Quoted Prices in Active Markets For Identical Assets (Level 1) | | | Significant Other Observable Inputs (Level 2) | | | Significant Unobservable Inputs (Level 3) | |
| Cash and cash equivalents | | $ | 92,829 | | | $ | 92,829 | | | $ | – | | | $ | – | |
| Restricted cash and cash equivalents | | | 19,358 | | | | 19,358 | | | | – | | | | – | |
| Marketable equity securities | | | 180,169 | | | | 180,169 | | | | – | | | | – | |
| Corporate debt securities | | | 58,898 | | | | 45,948 | | | | 12,950 | | | | – | |
| Asset–backed securities | | | 16,236 | | | | – | | | | 16,236 | | | | – | |
| U.S. Treasury securities | | | 42,836 | | | | 42,836 | | | | – | | | | – | |
| State and municipal securities | | | 5,323 | | | | 877 | | | | 4,446 | | | | – | |
| Total financial assets | | $ | 415,649 | | | $ | 382,017 | | | $ | 33,632 | | | $ | – | |
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