| Debt Securities, Available-for-Sale [Table Text Block] |
| | | | Amortized Cost | | | Fair Value | |
| | | | September 30, | | | December 31, | | | September 30, | | | December 31, | |
| | Longest Maturity Date | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| | | | | | | | | | | | | | | | | | |
| U.S. government and agency securities | 2029 | | $ | 6,627 | | | $ | 9,254 | | | $ | 6,648 | | | $ | 9,402 | |
| Corporate bonds | 2031 | | | 2,716 | | | | 3,062 | | | | 2,738 | | | | 3,121 | |
| | | | $ | 9,343 | | | $ | 12,316 | | | $ | 9,386 | | | $ | 12,523 | |
| | | Nine Months Ended September 30, | |
| | | 2026 | | | 2025 | |
| | | | | | | | | |
| Investment in debt securities – beginning balance | | $ | 12,523 | | | $ | 16,330 | |
| Purchases | | | 570 | | | | 5,506 | |
| Sales at cost | | | (3,610 | ) | | | (9,324 | ) |
| Realized gain from sale of investment in debt securities | | | 84 | | | | 93 | |
| Interest and dividend income | | | 410 | | | | 532 | |
| Unrealized gain | | | (144 | ) | | | 94 | |
| Professional management fees and other fees | | | (29 | ) | | | (34 | ) |
| Withdrawals from debt securities | | | (418 | ) | | | (581 | ) |
| Investment in debt securities – ending balance | | | 9,386 | | | | 12,616 | |
| Less – current portion | | | (5,457 | ) | | | (5,563 | ) |
| Investment in debt securities – non-current | | $ | 3,929 | | | $ | 7,053 | |
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