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INTEREST RATE SWAP DERIVATIVES (FY) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]            
Unrealized Gain (Loss) on Derivatives $ 553,490 $ 6,235 $ 874,016 $ (220,571) $ 157,613 $ (7,899)
Minimum            
Derivatives, Fair Value [Line Items]            
Notional Amount 24,967,299   24,967,299      
Interest Rate Swap            
Derivatives, Fair Value [Line Items]            
Notional Amount $ 27,212,600   $ 27,212,600   27,346,400  
Interest Rate Swap | Minimum            
Derivatives, Fair Value [Line Items]            
Notional Amount         $ 24,936,799  
(LIBOR) | Interest Rate Swap | Minimum            
Derivatives, Fair Value [Line Items]            
Derivative, Fixed Interest Rate 4.05%   4.05%   4.05% 4.05%
(LIBOR) | Interest Rate Swap | Maximum            
Derivatives, Fair Value [Line Items]            
Derivative, Fixed Interest Rate 5.16%   5.16%   5.16% 4.34%