| Marketable Securities [Table Text Block] |
| | | September 30, 2026 | | | December 31, 2025 | |
| | | Amortized Cost | | | Fair Value | | | Amortized Cost | | | Fair Value | |
| Investments available for sale: | | | | | | | | | | | | | | | | |
| Marketable equity securities | | $ | 30,176 | | | $ | 154,530 | | | $ | 30,176 | | | $ | 162,972 | |
| Restricted investments available for sale: | | | | | | | | | | | | | | | | |
| Marketable equity securities | | | 14,229 | | | | 19,153 | | | | 13,104 | | | | 17,197 | |
| Corporate debt securities | | | 60,124 | | | | 58,064 | | | | 58,458 | | | | 58,898 | |
| Asset-based securities | | | 16,399 | | | | 15,283 | | | | 16,886 | | | | 16,236 | |
| U.S. Treasury securities | | | 42,155 | | | | 39,846 | | | | 43,384 | | | | 42,836 | |
| State and municipal securities | | | 1,005 | | | | 1,002 | | | | 5,282 | | | | 5,323 | |
| | | $ | 164,088 | | | $ | 287,878 | | | $ | 167,290 | | | | 303,462 | |
|
| Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
| | | September 30, 2026 | | | December 31, 2025 | |
| | | Shares | | | Cost | | | Fair Value | | | Shares | | | Cost | | | Fair Value | |
| NHI Common Stock | | | 1,630,642 | | | $ | 24,734 | | | $ | 107,019 | | | | 1,630,642 | | | $ | 24,734 | | | $ | 124,532 | |
|
| Investments Classified by Contractual Maturity Date [Table Text Block] |
| | | September 30, 2026 | | | December 31, 2025 | |
| | | Cost | | | Fair Value | | | Cost | | | Fair Value | |
| Maturities: | | | | | | | | | | | | | | | | |
| Within 1 year | | $ | 14,459 | | | $ | 14,342 | | | $ | 14,309 | | | $ | 14,236 | |
| 1 to 5 years | | | 65,692 | | | | 62,866 | | | | 69,316 | | | | 68,390 | |
| 6 to 10 years | | | 38,722 | | | | 36,236 | | | | 40,385 | | | | 40,667 | |
| Over 10 years | | | 810 | | | | 751 | | | | – | | | | – | |
| | | $ | 119,683 | | | $ | 114,195 | | | $ | 124,010 | | | $ | 123,293 | |
|