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Lease Intangibles (Amortization Expense for the Company Lease Intangible Assets) (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Six months remaining in 2017 $ 749,854    
2017   $ 1,652,832  
2018 1,320,270 1,380,667  
2019 1,066,827 1,127,224  
2020 850,757 895,185  
2021 554,344 585,710  
Thereafter 339,372 224,916  
Lease intangibles, net $ 4,881,424 $ 5,866,534 $ 8,015,758