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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2021
FAIR VALUE OF FINANCIAL INSTRUMENTS |
Summary of value of assets designated as investments in debt and equity securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Equity securities | ​ | $ | 9,694,399 | ​ | $ | — | ​ | $ | — | ​ | $ | 9,694,399
Mutual funds and exchange traded funds | ​ | ​ | 4,132,439 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,132,439
Certificates of deposit | ​ |  | — | ​ |  | 76,194 | ​ |  | — | ​ |  | 76,194
​ | ​ | $ | 13,826,838 | ​ | $ | 76,194 | ​ | $ | — | ​ | $ | 13,903,032
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Equity securities | ​ | $ | 3,990,533 | ​ | $ | — | ​ | $ | — | ​ | $ | 3,990,533
Mutual funds and exchange traded funds | ​ | ​ | 4,013,956 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,013,956
Certificates of deposit | ​ |  | — | ​ |  | 77,344 | ​ |  | — | ​ |  | 77,344
​ | ​ | $ | 8,004,489 | ​ | $ | 77,344 | ​ | $ | — | ​ | $ | 8,081,833
Schedule of unrealized gains (losses) on investments in equity securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021
​ | ​ | ​ | ​ | ​ | Gross Unrealized | ​ | Aggregate
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Equity securities | ​ | $ | 6,667,281 | ​ | $ | 3,027,118 | ​ | $ | — | ​ | $ | 9,694,399
Mutual funds and exchange traded funds | ​ | ​ | 3,971,702 | ​ | ​ | 160,737 | ​ | ​ | — | ​ | ​ | 4,132,439
Certificates of deposit | ​ |  | 75,000 | ​ |  | 1,194 | ​ |  | — | ​ |  | 76,194
​ | ​ | $ | 10,713,983 | ​ | $ | 3,189,049 | ​ | $ | — | ​ | $ | 13,903,032
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | ​ | ​ | ​ | Gross Unrealized | ​ | Aggregate
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Equity securities | ​ | $ | 2,098,144 | ​ | $ | 1,892,389 | ​ | $ | — | ​ | $ | 3,990,533
Mutual funds and exchange traded funds | ​ | ​ | 3,909,364 | ​ | ​ | 104,592 | ​ | ​ | — | ​ | ​ | 4,013,956
Certificates of deposit | ​ |  | 75,000 | ​ |  | 2,344 | ​ |  | — | ​ |  | 77,344
​ | ​ | $ | 6,082,508 | ​ | $ | 1,999,325 | ​ | $ | — | ​ | $ | 8,081,833

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