| Debt Securities, Available-for-Sale [Table Text Block] |
| | | | Amortized Cost | | | Fair Value | |
| | | | June 30, | | | December 31, | | | June 30, | | | December 31, | |
| | Longest Maturity Date | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| | | | | | | | | | | | | | | | | | |
| U.S. government and agency securities | 2029 | | | 7,743 | | | | 9,254 | | | | 7,822 | | | | 9,402 | |
| Corporate bonds | 2031 | | | 2,716 | | | | 3,062 | | | | 2,759 | | | | 3,121 | |
| | | | | 10,459 | | | | 12,316 | | | | 10,581 | | | | 12,523 | |
| | | Six Months Ended June 30, | |
| | | 2026 | | | 2025 | |
| | | | | | | | | |
| Investment in debt securities – beginning balance | | $ | 12,523 | | | $ | 16,330 | |
| Purchases | | | 570 | | | | 4,927 | |
| Sales at cost | | | (2,460 | ) | | | (5,118 | ) |
| Realized gain from sale of investment in debt securities | | | 45 | | | | 68 | |
| Interest and dividend income | | | 272 | | | | 341 | |
| Unrealized gain | | | 169 | | | | 172 | |
| Professional management fees and other fees | | | (19 | ) | | | (24 | ) |
| Withdrawals from debt securities | | | (519 | ) | | | (484 | ) |
| Investment in debt securities – ending balance | | | 10,581 | | | | 16,212 | |
| Less – current portion | | | (6,511 | ) | | | (7,945 | ) |
| Investment in debt securities – non-current | | $ | 4,070 | | | $ | 8,267 | |
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