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Significant Accounting Policies (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Real Estate Asset Acquisitions [Abstract]        
Amortization of above and below market rents     $ (286,000) $ 44,000
Remaining term of in-place leases (in years)     10 years  
Amortization expense related to in-place leases, unamortized lease origination costs and tenant relationships     $ 1,224,000 839,000
Impairment [Abstract]        
Asset impairment     948,053 0
Sales of Real Estate Assets [Abstract]        
Asset impairment     948,053 0
Intangible Assets [Abstract]        
Impairment of definite lived assets     754,000 556,000
Impairment of indefinite lived assets     0 0
Impairment of goodwill     0 0
Depreciation and Amortization of Buildings and Improvements [Abstract]        
Depreciation expense     10,256,185 7,784,917
Cash and Cash Equivalents [Abstract]        
Deposits in financial institutions that exceeded the federally insurable limits     650,000  
Cash balances may exceed federally insured limit     250,000  
Loss on federal deposit insurance corporation     0  
Tenant Receivables [Abstract]        
Allowance for uncollectible accounts     26,000 91,000
Deferred Leasing Costs [Abstract]        
Net deferred leasing costs     1,920,000 1,483,000
Amortization of deferred leasing costs     494,000 412,000
Deferred Financing Costs [Abstract]        
Unamortized deferred financing costs     1,942,000 2,052,000
Amortization of financing costs $ 743,291 $ 735,307 $ 1,447,021 1,286,437
Income Tax Uncertainties [Abstract]        
Income Tax Examination Description     We have elected to be taxed as a REIT under Sections 856 through 860 of the Code, for federal income tax purposes. To maintain our qualification as a REIT, we are required to distribute at least 90% of our REIT taxable income to our stockholders and meet the various other requirements imposed by the Code relating to such matters as operating results, asset holdings, distribution levels and diversity of stock ownership  
Percentage of distributed taxable income to qualify as REIT     90.00%  
Revenue Recognition [Abstract]        
Deferred rent receivable     $ 0 $ 0
Loss Per Common Share [Abstract]        
Anti-dilutive shares excluded from computation of diluted earnings per share     643,510 722,019
Adjustments for New Accounting Principle, Early Adoption [Member] | Restricted Cash [Member]        
Loss Per Common Share [Abstract]        
New accounting pronouncement effect, restricted cash     $ 4,300,000 $ 6,800,000
Mortgage Payable        
Deferred Financing Costs [Abstract]        
Amortization of financing costs     433,000 335,000
Series B Preferred Stock [Member]        
Deferred Financing Costs [Abstract]        
Unamortized deferred financing costs     592,000 1,606,000
Series B Preferred Stock [Member] | Mortgage Payable        
Deferred Financing Costs [Abstract]        
Amortization of financing costs     $ 1,014,000 $ 952,000
Building and Building Improvements [Member]        
Depreciation and Amortization of Buildings and Improvements [Abstract]        
Estimated useful life     39 years  
Assets Leased to Others [Member] | Minimum [Member]        
Depreciation and Amortization of Buildings and Improvements [Abstract]        
Estimated useful life     1 year  
Assets Leased to Others [Member] | Maximum [Member]        
Depreciation and Amortization of Buildings and Improvements [Abstract]        
Estimated useful life     10 years  
Furniture and Fixtures [Member] | Minimum [Member]        
Depreciation and Amortization of Buildings and Improvements [Abstract]        
Estimated useful life     4 years  
Furniture and Fixtures [Member] | Maximum [Member]        
Depreciation and Amortization of Buildings and Improvements [Abstract]        
Estimated useful life     5 years