Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] |
| | December 31, 2023 | | | December 31, 2022 | |
| | Cost | | | Fair Value | | | Cost | | | Fair Value | |
Debt - Trading Securities: | | | | | | | | | | | | | | | | |
U.S. Treasury Bills | | $ | 88,300 | | | $ | 89,155 | | | $ | 184,636 | | | $ | 186,001 | |
Equity Securities: | | | | | | | | | | | | | | | | |
Common stocks | | | 198,269 | | | | 191,346 | | | | 221,794 | | | | 189,977 | |
Mutual funds | | | 566 | | | | 1,186 | | | | 539 | | | | 906 | |
Other investments | | | 5,166 | | | | 4,051 | | | | 6,364 | | | | 4,702 | |
Total investments in equity securities | | | 204,001 | | | | 196,583 | | | | 228,697 | | | | 195,585 | |
Total investments in securities | | $ | 292,301 | | | $ | 285,738 | | | $ | 413,333 | | | $ | 381,586 | |
| | December 31, 2023 | | | December 31, 2022 | |
| | Cost | | | Fair Value | | | Cost | | | Fair Value | |
| | | | | | | | | | | | | | | | |
Closed-end funds | | $ | 39,680 | | | $ | 53,048 | | | $ | 45,029 | | | $ | 56,772 | |
Mutual funds | | | 50,136 | | | | 73,703 | | | | 50,224 | | | | 69,438 | |
Total investments in affiliated registered investment companies | | $ | 89,816 | | | $ | 126,751 | | | $ | 95,253 | | | $ | 126,210 | |
|
Security Sold Short [Table Text Block] |
| | December 31, 2023 | | | December 31, 2022 | |
| | Cost | | | Fair Value | | | Cost | | | Fair Value | |
| | | | | | | | | | | | | | | | |
Common stocks | | $ | 5,227 | | | $ | 5,035 | | | $ | 2,918 | | | $ | 2,509 | |
Other investments | | | 631 | | | | 883 | | | | 499 | | | | 365 | |
Total securities sold, not yet purchased | | $ | 5,858 | | | $ | 5,918 | | | $ | 3,417 | | | $ | 2,874 | |
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