| Schedule of fair value measurements [Table Text Block] |
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Fair value measurement at reporting date using |
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Balance |
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Quoted prices
in active
markets for
identical assets
(Level 1) |
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Significant
other
observable
inputs (Level 2) |
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Significant
unobservable
inputs (Level 3) |
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| As of June 30, 2026: |
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| Recurring fair value measurements |
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| Debt securities: |
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| Short-term investments |
$ |
21,730,346 |
|
$ |
21,730,346 |
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$ |
- |
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$ |
- |
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| Investments - restricted |
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508,229 |
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508,229 |
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|
- |
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|
- |
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| Total debt securities |
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22,238,575 |
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|
22,238,575 |
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|
- |
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- |
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| Total recurring fair value measurements |
$ |
22,238,575 |
|
$ |
22,238,575 |
|
$ |
- |
|
$ |
- |
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| |
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| As of December 31, 2025: |
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| Recurring fair value measurements |
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| Debt securities: |
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| Short-term investments |
$ |
15,274,175 |
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$ |
15,274,175 |
|
$ |
- |
|
$ |
- |
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| Total debt securities |
|
15,274,175 |
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|
15,274,175 |
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|
- |
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|
- |
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| Total recurring fair value measurements |
$ |
15,274,175 |
|
$ |
15,274,175 |
|
$ |
- |
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$ |
- |
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| Nonrecurring fair value measurements |
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| Right of use assets - operating lease |
|
323,983 |
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|
- |
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|
- |
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|
323,983 |
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| Total nonrecurring fair value measurements |
$ |
323,983 |
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$ |
- |
|
$ |
- |
|
$ |
323,983 |
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