FINANCIAL INSTRUMENTS FINANCIAL INSTRUMENTS - Fair Value Information on Financial Instruments (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 13,640,181	$ 7,882,862
Restricted cash	52,348,987	51,330,950
Total assets	659,406,989	679,352,035
Collateralized loan obligations	504,460,023	503,978,918
Total	39,300,544	0
Total liabilities	550,136,102	529,148,697
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	13,640,181	7,882,862
Restricted cash	52,348,987	51,330,950
Commercial mortgage loans held-for-investment, at amortized cost	585,770,803	555,172,891
Cash held in securitization trusts, at fair value		24,357,335
Total assets	651,759,971	638,744,038
Collateralized loan obligations	504,460,023	503,978,918
Total	39,300,544
Total liabilities	543,760,567	503,978,918
Face Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	13,640,181	7,882,862
Restricted cash	52,348,987	51,330,950
Commercial mortgage loans held-for-investment, at amortized cost	585,770,803	555,172,891
Cash held in securitization trusts, at fair value		24,357,335
Total assets	651,759,971	638,744,038
Collateralized loan obligations	510,181,000	510,181,000
Total	40,250,000
Total liabilities	550,431,000	510,181,000
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	13,640,181	7,882,862
Restricted cash	52,348,987	51,330,950
Commercial mortgage loans held-for-investment, at amortized cost	585,770,803	555,172,891
Cash held in securitization trusts, at fair value		24,357,335
Total assets	651,759,971	638,744,038
Collateralized loan obligations	509,101,491	509,000,439
Total	40,250,000
Total liabilities	$ 549,351,491	$ 509,000,439