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Note 9 - Investments in Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Marketable Securities [Table Text Block] |
|  | June 30, 2025 |  |  | December 31, 2024 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Investments available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities |  | $ | 30,176 |  |  | $ | 146,636 |  |  | $ | 30,176 |  |  | $ | 140,064 |
Restricted investments available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities |  |  | 12,263 |  |  |  | 16,269 |  |  |  | 18,534 |  |  |  | 23,190 |
Corporate debt securities |  |  | 60,995 |  |  |  | 60,888 |  |  |  | 58,927 |  |  |  | 57,471 |
Asset-based securities |  |  | 14,327 |  |  |  | 13,381 |  |  |  | 15,593 |  |  |  | 14,410 |
U.S. Treasury securities |  |  | 56,631 |  |  |  | 55,718 |  |  |  | 46,811 |  |  |  | 44,186 |
State and municipal securities |  |  | 3,736 |  |  |  | 3,714 |  |  |  | 3,787 |  |  |  | 3,737 |
|  | $ | 178,128 |  |  | $ | 296,606 |  |  | $ | 173,828 |  |  |  | 283,058 |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2025 |  |  | December 31, 2024 |
|  | Shares |  |  | Cost |  |  | Fair Value |  |  | Shares |  |  | Cost |  |  | Fair Value |
NHI Common Stock |  |  | 1,630,642 |  |  | $ | 24,734 |  |  | $ | 114,341 |  |  |  | 1,630,642 |  |  | $ | 24,734 |  |  | $ | 113,003 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | June 30, 2025 |  |  | December 31, 2024 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within 1 year |  | $ | 31,840 |  |  | $ | 31,665 |  |  | $ | 25,707 |  |  | $ | 25,317 |
1 to 5 years |  |  | 63,525 |  |  |  | 62,311 |  |  |  | 66,117 |  |  |  | 63,379 |
6 to 10 years |  |  | 39,769 |  |  |  | 39,280 |  |  |  | 32,648 |  |  |  | 30,606 |
Over 10 years |  |  | 555 |  |  |  | 445 |  |  |  | 646 |  |  |  | 502 |
|  | $ | 135,689 |  |  | $ | 133,701 |  |  | $ | 125,118 |  |  | $ | 119,804 |

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