DERIVATIVE FINANCIAL INSTRUMENTS - Effect on statements of income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
DERIVATIVE FINANCIAL INSTRUMENTS
Net unrealized (loss) gain on derivative instruments for interest rate swaps	$ 172,585	$ (58,554)	$ 294,931
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging
DERIVATIVE FINANCIAL INSTRUMENTS
Net unrealized (loss) gain on derivative instruments for interest rate swaps	$ 172,585	$ (58,554)	$ 294,931
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Investment Income, Interest	Investment Income, Interest	Investment Income, Interest
Total Amount of Interest Expense presented in the consolidated statements of operations	$ (15,457,325)	$ (15,723,733)	$ (15,045,477)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Expense, Nonoperating	Interest Expense, Nonoperating	Interest Expense, Nonoperating