FAIR VALUE MEASUREMENTS - Schedule of fair value measurements (Details) - USD ($)	Jun. 30, 2026	Dec. 31, 2025
Debt securities:
Short-term investments	$ 21,730,346	$ 15,274,175
Right of use assets – operating lease	447,576	477,577
Recurring fair value measurements [Member]
Debt securities:
Short-term investments	21,730,346	15,274,175
Investments - restricted	508,229
Total debt securities	22,238,575	15,274,175
Total fair value measurements	22,238,575	15,274,175
Recurring fair value measurements [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Debt securities:
Short-term investments	21,730,346	15,274,175
Investments - restricted	508,229
Total debt securities	22,238,575	15,274,175
Total fair value measurements	22,238,575	15,274,175
Recurring fair value measurements [Member] \| Significant other observable inputs (Level 2) [Member]
Debt securities:
Short-term investments	0	0
Investments - restricted	0
Total debt securities	0	0
Total fair value measurements	0	0
Recurring fair value measurements [Member] \| Significant unobservable inputs (Level 3) [Member]
Debt securities:
Short-term investments	0	0
Investments - restricted	0
Total debt securities	0	0
Total fair value measurements	$ 0	0
Nonrecurring fair value measurements [Member]
Debt securities:
Right of use assets – operating lease		323,983
Total fair value measurements		323,983
Nonrecurring fair value measurements [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Debt securities:
Right of use assets – operating lease		0
Total fair value measurements		0
Nonrecurring fair value measurements [Member] \| Significant other observable inputs (Level 2) [Member]
Debt securities:
Right of use assets – operating lease		0
Total fair value measurements		0
Nonrecurring fair value measurements [Member] \| Significant unobservable inputs (Level 3) [Member]
Debt securities:
Right of use assets – operating lease		323,983
Total fair value measurements		$ 323,983

Fair value portion of asset recognized for present right to economic benefit.

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Fair value of asset after deduction of liability.

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Amount of lessee's right to use underlying asset under operating lease.

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The aggregate value of all restricted investments.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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