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DERIVATIVE FINANCIAL INSTRUMENTS - Effect on statements of income (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
DERIVATIVE FINANCIAL INSTRUMENTS        
Net unrealized (loss) gain on derivative instruments for interest rate swaps $ (64,024) $ 32,524 $ (193,914) $ 174,558
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging        
DERIVATIVE FINANCIAL INSTRUMENTS        
Net unrealized (loss) gain on derivative instruments for interest rate swaps (64,024) 32,524 (193,914) 174,558
Total Amount of Interest Expense presented in the consolidated statements of operations $ (4,136,156) $ (3,899,695) $ (7,927,588) $ (7,806,711)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Investment Income, Interest Investment Income, Interest Investment Income, Interest Investment Income, Interest