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SIGNIFICANT ACCOUNTING POLICIES (Details)
 12 Months Ended
Feb. 05, 2020
USD ($)
Dec. 31, 2019
USD ($)
operatingLease
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Real Estate Asset Acquisitions [Abstract]      
Amortization of above and below market rents   $ 131,000 $ 826,000
Remaining term of in-place leases (in years)   10 years  
Amortization expense related to in-place leases, unamortized lease origination costs and tenant relationships   $ 413,000 569,000
Asset impairment charge   0 532,951
Intangible Assets [Abstract]      
Impairment of definite lived assets   274,000 415,000
Impairment of indefinite lived assets   0 0
Depreciation and Amortization of Buildings and Improvements [Abstract]      
Depreciation expense   7,400,000 9,100,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]      
Cash balances may exceed federally insured limit   250,000  
Loss on federal deposit insurance corporation   0  
Deposits in financial institutions that exceeded the federally insurable limits   8,600,000  
Restricted cash   4,700,000  
Accounts Receivables [Abstract]      
Allowance for uncollectible accounts   21,000 60,000
Deferred Leasing Costs [Abstract]      
Net deferred leasing costs   2,054,000 2,097,000
Amortization of deferred leasing costs, after ASC 842   646,000  
Amortization of deferred leasing costs     510,000
Deferred Financing Costs [Abstract]      
Unamortized deferred financing costs   1,066,000 1,427,000
Amortization of financing costs   $ 965,239 $ 675,087
Income Tax Uncertainties [Abstract]      
Income tax description   We have elected to be taxed as a REIT under Sections 856 through 860 of the Internal Revenue Code (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%  
Loss Per Common Share [Abstract]      
Basic and diluted net income (loss) per share (in dollars per share) | $ / shares   $ (0.03) $ 0.19
Anti-dilutive shares included in computation of diluted earnings per share (in shares) | shares   746,517  
Anti-dilutive shares excluded from computation of diluted earnings per share (in shares) | shares     733,944
Recently Issued Accounting Pronouncements [Abstract]      
Right of use asset, net   $ 661,000  
Lease liabilities   $ 661,000  
Accounting Standards Update 2016-02      
Recently Issued Accounting Pronouncements [Abstract]      
Number of operating lease, right-of-use assets | operatingLease   2  
Number operating lease liabilities | operatingLease   2  
Federal      
Income Tax Uncertainties [Abstract]      
Net operating losses carry-forwards   $ 3,900,000  
Mortgage Payable      
Deferred Financing Costs [Abstract]      
Amortization of financing costs   470,000 $ 529,000
Polar Multi-Strategy Master Fund | Notes Payable to Banks      
Deferred Financing Costs [Abstract]      
Unamortized deferred financing costs   748,000  
Amortization of financing costs   373,000  
Series B Preferred Stock      
Deferred Financing Costs [Abstract]      
Unamortized deferred financing costs   0 122,000
Series B Preferred Stock | Mortgage Payable      
Deferred Financing Costs [Abstract]      
Amortization of financing costs   122,000 147,000
Waterman Plaza      
Real Estate Asset Acquisitions [Abstract]      
Asset impairment charge   $ 0 $ 533,000
Centennial Tech Center | Subsequent Event      
Subsequent Events [Abstract]      
Proceeds from sale of property $ 15,000,000.0    
Gain (loss) on sale of property $ 4,300,000    
Building and Building Improvements      
Depreciation and Amortization of Buildings and Improvements [Abstract]      
Estimated useful life   39 years  
Assets Leased to Others | Minimum      
Depreciation and Amortization of Buildings and Improvements [Abstract]      
Estimated useful life   1 year  
Assets Leased to Others | Maximum      
Depreciation and Amortization of Buildings and Improvements [Abstract]      
Estimated useful life   10 years  
Furniture and Fixtures | Minimum      
Depreciation and Amortization of Buildings and Improvements [Abstract]      
Estimated useful life   4 years  
Furniture and Fixtures | Maximum      
Depreciation and Amortization of Buildings and Improvements [Abstract]      
Estimated useful life   5 years