SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Held-to-maturity (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| SUMMARY OF PRINCIPAL ACCOUNTING POLICIES | |||
| Held-to-maturity investments | $ 10,046,645 | $ 0 | |
| Investment gain from treasury note | $ 174,380 | $ 0 | $ 0 |