FINANCIAL INSTRUMENTS -Fair Value Information on Financial Instruments (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 7,882,862	$ 34,347,339
Restricted cash	51,330,950	11,275,263
Cash held in securitization trusts	24,357,335
Commercial mortgage loans held-for-investment	555,172,891
Total Assets	638,744,038	45,622,602
Collateralized loan obligations	503,978,918	1,234,522,000
Total Liabilities	503,978,918	1,234,522,000
Face Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	7,882,862	34,347,339
Restricted cash	51,330,950	11,275,263
Cash held in securitization trusts	24,357,335
Commercial mortgage loans held-for-investment	555,172,891
Total Assets	638,744,038	45,622,602
Collateralized loan obligations	510,181,000	1,234,522,000
Total Liabilities	510,181,000	1,234,522,000
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	7,882,862	34,347,339
Restricted cash	51,330,950	11,275,263
Cash held in securitization trusts	24,357,335
Commercial mortgage loans held-for-investment	555,172,891
Total Assets	638,744,038	45,622,602
Collateralized loan obligations	509,000,439	1,234,522,000
Total Liabilities	$ 509,000,439	$ 1,234,522,000