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Note 9 - Investments in Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Marketable Securities [Table Text Block] |
|  | September 30, 2025 |  |  | December 31, 2024 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Investments available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities |  | $ | 30,176 |  |  | $ | 166,754 |  |  | $ | 30,176 |  |  | $ | 140,064 |
Restricted investments available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities |  |  | 12,767 |  |  |  | 17,482 |  |  |  | 18,534 |  |  |  | 23,190 |
Corporate debt securities |  |  | 62,677 |  |  |  | 63,095 |  |  |  | 58,927 |  |  |  | 57,471 |
Asset-based securities |  |  | 13,759 |  |  |  | 12,942 |  |  |  | 15,593 |  |  |  | 14,410 |
U.S. Treasury securities |  |  | 44,470 |  |  |  | 43,771 |  |  |  | 46,811 |  |  |  | 44,186 |
State and municipal securities |  |  | 3,115 |  |  |  | 3,104 |  |  |  | 3,787 |  |  |  | 3,737 |
|  | $ | 166,964 |  |  | $ | 307,148 |  |  | $ | 173,828 |  |  |  | 283,058 |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2025 |  |  | December 31, 2024 |
|  | Shares |  |  | Cost |  |  | Fair Value |  |  | Shares |  |  | Cost |  |  | Fair Value |
NHI Common Stock |  |  | 1,630,642 |  |  | $ | 24,734 |  |  | $ | 129,636 |  |  |  | 1,630,642 |  |  | $ | 24,734 |  |  | $ | 113,003 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | September 30, 2025 |  |  | December 31, 2024 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within 1 year |  | $ | 17,348 |  |  | $ | 17,010 |  |  | $ | 25,707 |  |  | $ | 25,317 |
1 to 5 years |  |  | 51,371 |  |  |  | 51,167 |  |  |  | 66,117 |  |  |  | 63,379 |
6 to 10 years |  |  | 38,826 |  |  |  | 39,123 |  |  |  | 32,648 |  |  |  | 30,606 |
Over 10 years |  |  | 16,476 |  |  |  | 15,612 |  |  |  | 646 |  |  |  | 502 |
|  | $ | 124,021 |  |  | $ | 122,912 |  |  | $ | 125,118 |  |  | $ | 119,804 |

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