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TAXABLE INCOME AND TAX BASIS (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
TAXABLE INCOME AND TAX BASIS |  |  |  |  |
Excess amount of statement income over taxable income |  |  |  |  | $ 1,500,000
Excess amount of cumulative statement basis over cumulative taxable basis |  |  |  |  | 1,532,000
Excess amount of statement income from joint venture investments over taxable income |  |  |  |  | 5,000,000
Reconciliation of GAAP net income to taxable income |  |  |  |  |
Financial statement ("book") net income | $ 660,329 | $ 871,720 | $ 2,592,212 | $ 5,249,663 |
Reconciliation of Income from Book Basis to Tax Basis Profit (Loss) Tax Basis |  |  |  |  | $ 5,438,000

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