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INVESTMENT SECURITIES HELD TO MATURITY (Tables) | 9 Months Ended
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Sep. 30, 2025
INVESTMENT SECURITIES HELD TO MATURITY |
Schedule of Company's investment securities held to maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Estimated Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
Investment securities held to maturity - current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury Strips | ​ | $ | 1,270,666 | ​ | $ | 684 | ​ | $ | — | ​ | $ | 1,271,350
Investment securities held to maturity - noncurrent: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury Strips | ​ |  | 18,886,727 | ​ |  | 37,526 | ​ |  | (4,604) | ​ |  | 18,919,649
Total investment securities held-to-maturity | ​ | $ | 20,157,393 | ​ | $ | 38,210 | ​ | $ | (4,604) | ​ | $ | 20,190,999
Schedule of Company's classification securities of its U.S. Treasury Strips as held to maturity period | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Estimated Fair
Twelve months ending September 30, |  | Cost |  | Value
2026 | ​ | $ | 1,270,666 | ​ | $ | 1,271,350
2027 to 2030 | ​ |  | 18,886,727 | ​ |  | 18,919,649
Total investment securities held-to-maturity | ​ | $ | 20,157,393 | ​ | $ | 20,190,999

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