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Other Assets (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Assets [Line Items]      
Raw land $ 49,246,634 $ 51,274,462 $ 49,965,418
Other intangibles, net 415,182 455,632 536,533
Total other assets 5,451,230 5,745,982 5,895,991
Other Assets [Member]      
Other Assets [Line Items]      
Deferred rent receivable 2,920,529 2,950,034 2,097,623
Raw land 900,000 900,000 900,000
Prepaid expenses, deposits and other 648,904 564,983 758,173
Accounts receivable, net 250,241 558,959 683,446
Notes receivable $ 316,374 $ 316,374 $ 920,216