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Other Assets (Detail) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Assets [Line Items]      
Raw land $ 46,105,130 $ 47,190,225 $ 49,965,418
Other intangibles, net 394,958 455,632 536,533
Total other assets 5,612,568 5,745,982 5,895,991
Other Assets [Member]      
Other Assets [Line Items]      
Deferred rent receivable 3,055,566 2,950,034 2,097,623
Raw land 900,000 900,000 900,000
Prepaid expenses, deposits and other 639,932 564,983 758,173
Accounts receivable, net 305,738 558,959 683,446
Notes receivable $ 316,374 $ 316,374 $ 920,216