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Note 9 - Investments in Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Marketable Securities [Table Text Block] |
|  | June 30, 2024 |  |  | December 31, 2023 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Investments available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities |  | $ | 30,176 |  |  | $ | 133,317 |  |  | $ | 30,176 |  |  | $ | 111,117 |
Corporate debt securities |  |  | 494 |  |  |  | 488 |  |  |  | 2,497 |  |  |  | 2,441 |
U.S. Treasury securities |  |  | – |  |  |  | – |  |  |  | 2,990 |  |  |  | 2,986 |
Restricted investments available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities |  |  | 17,597 |  |  |  | 21,566 |  |  |  | 24,134 |  |  |  | 26,779 |
Corporate debt securities |  |  | 57,688 |  |  |  | 55,536 |  |  |  | 59,586 |  |  |  | 57,731 |
Asset-based securities |  |  | 18,421 |  |  |  | 16,924 |  |  |  | 19,388 |  |  |  | 17,659 |
U.S. Treasury securities |  |  | 46,019 |  |  |  | 43,094 |  |  |  | 46,771 |  |  |  | 42,863 |
State and municipal securities |  |  | 3,839 |  |  |  | 3,753 |  |  |  | 4,106 |  |  |  | 4,047 |
|  | $ | 174,234 |  |  | $ | 274,678 |  |  | $ | 189,648 |  |  |  | 265,623 |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2024 |  |  | December 31, 2023 |
|  | Shares |  |  | Cost |  |  | Fair Value |  |  | Shares |  |  | Cost |  |  | Fair Value |
NHI Common Stock |  |  | 1,630,642 |  |  | $ | 24,734 |  |  | $ | 110,443 |  |  |  | 1,630,642 |  |  | $ | 24,734 |  |  | $ | 91,071 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | June 30, 2024 |  |  | December 31, 2023 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within 1 year |  | $ | 20,602 |  |  | $ | 20,058 |  |  | $ | 19,664 |  |  | $ | 19,328 |
1 to 5 years |  |  | 71,239 |  |  |  | 67,679 |  |  |  | 81,517 |  |  |  | 77,118 |
6 to 10 years |  |  | 34,007 |  |  |  | 31,582 |  |  |  | 33,515 |  |  |  | 30,802 |
Over 10 years |  |  | 613 |  |  |  | 476 |  |  |  | 642 |  |  |  | 479 |
|  | $ | 126,461 |  |  | $ | 119,795 |  |  | $ | 135,338 |  |  | $ | 127,727 |

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