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SCHEDULE OF REAL ESTATE PROPERTY COST, IMPROVEMENTS AND DEPRECIATION (Details) - USD ($)
 12 Months Ended
Feb. 19, 2021
Feb. 19, 2021
Jan. 28, 2021
Jan. 28, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         $ 120,788,000    
Land, Initial Cost         30,297,000    
Building and Improvements, Initial Cost         164,472,000    
Acquisition Price         195,452,000    
Capitalized Improvements         26,279,000    
Land Cost, Total Cost         30,330,000    
Building & Improvements, Total Cost         155,296,000    
Total cost         211,905,000    
Accumulated Depreciation & Depreciation         42,387,199 [1] $ 44,113,962 $ 43,567,809
Reserve for Impairment         3,264,000    
NBV Real Estate         $ 166,254,000    
Building and Building Improvements [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation         39 years    
Garden Gateway [Member] | Subsequent Event [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Proceeds from Sale of Real Estate $ 11,200,000 $ 11,200,000          
Waterman Plaza [Member] | Subsequent Event [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Proceeds from Sale of Real Estate     $ 3,500,000 $ 3,500,000      
Industrial Office Properties [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         $ 73,618,000    
Land, Initial Cost         16,539,000    
Building and Improvements, Initial Cost         104,660,000    
Acquisition Price         121,882,000    
Capitalized Improvements         23,723,000    
Land Cost, Total Cost         16,539,000    
Building & Improvements, Total Cost         94,071,000    
Total cost         134,333,000    
Accumulated Depreciation & Depreciation [1]         34,743,000    
Reserve for Impairment         400,000    
NBV Real Estate         99,190,000    
Industrial Office Properties [Member] | Garden Gateway [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances [2]         5,861,000    
Land, Initial Cost [2]         3,035,000    
Building and Improvements, Initial Cost [2]         12,091,000    
Acquisition Price [2]         15,126,000    
Capitalized Improvements [2]         3,329,000    
Land Cost, Total Cost [2]         3,035,000    
Building & Improvements, Total Cost [2]         10,874,000    
Total cost [2]         17,238,000    
Accumulated Depreciation & Depreciation [1],[2]         5,774,000    
Reserve for Impairment [2]            
NBV Real Estate [2]         11,464,000    
Industrial Office Properties [Member] | Executive Park [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances [2]         2,986,000    
Land, Initial Cost [2]         583,000    
Building and Improvements, Initial Cost [2]         8,815,000    
Acquisition Price [2]         10,081,000    
Capitalized Improvements [2]         1,473,000    
Land Cost, Total Cost [2]         583,000    
Building & Improvements, Total Cost [2]         5,561,000    
Total cost [2]         7,617,000    
Accumulated Depreciation & Depreciation [1],[2]         2,510,000    
Reserve for Impairment [2]            
NBV Real Estate [2]         5,107,000    
Industrial Office Properties [Member] | Genesis Plaza [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         6,276,000    
Land, Initial Cost         1,400,000    
Building and Improvements, Initial Cost         8,600,000    
Acquisition Price         10,000,000    
Capitalized Improvements         2,625,000    
Land Cost, Total Cost         1,400,000    
Building & Improvements, Total Cost         8,323,000    
Total cost         12,348,000    
Accumulated Depreciation & Depreciation [1]         3,697,000    
Reserve for Impairment            
NBV Real Estate         8,651,000    
Industrial Office Properties [Member] | Dakota Center [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         9,900,000    
Land, Initial Cost         832,000    
Building and Improvements, Initial Cost         8,743,000    
Acquisition Price         9,575,000    
Capitalized Improvements         1,306,000    
Land Cost, Total Cost         832,000    
Building & Improvements, Total Cost         9,960,000    
Total cost         12,098,000    
Accumulated Depreciation & Depreciation [1]         3,500,000    
Reserve for Impairment            
NBV Real Estate         8,598,000    
Industrial Office Properties [Member] | Grand Pacific Center [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         3,738,000    
Land, Initial Cost         413,000    
Building and Improvements, Initial Cost         4,926,000    
Acquisition Price         5,339,000    
Capitalized Improvements         904,000    
Land Cost, Total Cost         413,000    
Building & Improvements, Total Cost         6,099,000    
Total cost         7,416,000    
Accumulated Depreciation & Depreciation [1]         1,732,000    
Reserve for Impairment            
NBV Real Estate         5,684,000    
Industrial Office Properties [Member] | Arapahoe Center [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         7,932,000    
Land, Initial Cost         1,420,000    
Building and Improvements, Initial Cost         10,430,000    
Acquisition Price         11,850,000    
Capitalized Improvements         2,078,000    
Land Cost, Total Cost         1,420,000    
Building & Improvements, Total Cost         8,857,000    
Total cost         12,355,000    
Accumulated Depreciation & Depreciation [1]         3,122,000    
Reserve for Impairment            
NBV Real Estate         9,233,000    
Industrial Office Properties [Member] | West Fargo Industrial [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         4,263,000    
Land, Initial Cost         1,693,000    
Building and Improvements, Initial Cost         6,207,000    
Acquisition Price         7,900,000    
Capitalized Improvements         264,000    
Land Cost, Total Cost         1,693,000    
Building & Improvements, Total Cost         6,099,000    
Total cost         8,056,000    
Accumulated Depreciation & Depreciation [1]         995,000    
Reserve for Impairment            
NBV Real Estate         7,061,000    
Industrial Office Properties [Member] | The 300 N.P [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         2,274,000    
Land, Initial Cost         135,000    
Building and Improvements, Initial Cost         3,715,000    
Acquisition Price         3,850,000    
Capitalized Improvements         319,000    
Land Cost, Total Cost         135,000    
Building & Improvements, Total Cost         3,589,000    
Total cost         4,043,000    
Accumulated Depreciation & Depreciation [1]         764,000    
Reserve for Impairment            
NBV Real Estate         3,279,000    
Industrial Office Properties [Member] | Highland Court [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances [2]         6,275,000    
Land, Initial Cost [2]         3,608,000    
Building and Improvements, Initial Cost [2]         9,442,000    
Acquisition Price [2]         13,050,000    
Capitalized Improvements [2]         3,408,000    
Land Cost, Total Cost [2]         3,608,000    
Building & Improvements, Total Cost [2]         7,767,000    
Total cost [2]         14,783,000    
Accumulated Depreciation & Depreciation [1],[2]         3,883,000    
Reserve for Impairment [2]         400,000    
NBV Real Estate [2]         10,500,000    
Industrial Office Properties [Member] | One Park Centre [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         6,385,000    
Land, Initial Cost         1,206,000    
Building and Improvements, Initial Cost         7,944,000    
Acquisition Price         9,150,000    
Capitalized Improvements         1,952,000    
Land Cost, Total Cost         1,206,000    
Building & Improvements, Total Cost         7,416,000    
Total cost         10,574,000    
Accumulated Depreciation & Depreciation [1]         1,987,000    
Reserve for Impairment            
NBV Real Estate         8,587,000    
Industrial Office Properties [Member] | Shea Center II [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         17,728,000    
Land, Initial Cost         2,214,000    
Building and Improvements, Initial Cost         23,747,000    
Acquisition Price         25,961,000    
Capitalized Improvements         6,065,000    
Land Cost, Total Cost         2,214,000    
Building & Improvements, Total Cost         19,526,000    
Total cost         27,805,000    
Accumulated Depreciation & Depreciation [1]         6,779,000    
Reserve for Impairment            
NBV Real Estate         21,026,000    
Retail Properties [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         19,087,000    
Land, Initial Cost         6,206,000    
Building and Improvements, Initial Cost         22,950,000    
Acquisition Price         29,156,000    
Capitalized Improvements         2,556,000    
Land Cost, Total Cost         6,239,000    
Building & Improvements, Total Cost         24,363,000    
Total cost         33,158,000    
Accumulated Depreciation & Depreciation [1]         5,740,000    
Reserve for Impairment         2,864,000    
NBV Real Estate         24,554,000    
Retail Properties [Member] | World Plaza [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances [2]         5,803,000    
Land, Initial Cost [2]         1,698,000    
Building and Improvements, Initial Cost [2]         6,232,000    
Acquisition Price [2]         7,930,000    
Capitalized Improvements [2]         1,761,000    
Land Cost, Total Cost [2]         1,698,000    
Building & Improvements, Total Cost [2]         8,758,000    
Total cost [2]         12,217,000    
Accumulated Depreciation & Depreciation [1],[2]         2,246,000    
Reserve for Impairment [2]         700,000    
NBV Real Estate [2]         9,271,000    
Retail Properties [Member] | Waterman Plaza [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances [2]         3,208,000    
Land, Initial Cost [2]         2,350,000    
Building and Improvements, Initial Cost [2]         4,814,000    
Acquisition Price [2]         7,164,000    
Capitalized Improvements [2]         239,000    
Land Cost, Total Cost [2]         2,383,000    
Building & Improvements, Total Cost [2]         4,324,000    
Total cost [2]         6,946,000    
Accumulated Depreciation & Depreciation [1],[2]         1,282,000    
Reserve for Impairment [2]         2,164,000    
NBV Real Estate [2]         3,500,000    
Retail Properties [Member] | Union Town Center [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         8,316,000    
Land, Initial Cost         1,750,000    
Building and Improvements, Initial Cost         9,462,000    
Acquisition Price         11,212,000    
Capitalized Improvements         513,000    
Land Cost, Total Cost         1,750,000    
Building & Improvements, Total Cost         8,932,000    
Total cost         11,195,000    
Accumulated Depreciation & Depreciation [1]         1,851,000    
Reserve for Impairment            
NBV Real Estate         9,344,000    
Retail Properties [Member] | Research Parkway [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         1,760,000    
Land, Initial Cost         408,000    
Building and Improvements, Initial Cost         2,442,000    
Acquisition Price         2,850,000    
Capitalized Improvements         43,000    
Land Cost, Total Cost         408,000    
Building & Improvements, Total Cost         2,349,000    
Total cost         2,800,000    
Accumulated Depreciation & Depreciation [1]         361,000    
Reserve for Impairment            
NBV Real Estate         2,439,000    
Model Home [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         28,083,000    
Land, Initial Cost         7,552,000    
Building and Improvements, Initial Cost         36,862,000    
Acquisition Price         44,414,000    
Land Cost, Total Cost         7,552,000    
Building & Improvements, Total Cost         36,862,000    
Total cost         44,414,000    
Accumulated Depreciation & Depreciation [1]         1,904,000    
NBV Real Estate         42,510,000    
Model Home [Member] | Model Homes -NDMHR, LP [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         974,000    
Land, Initial Cost         534,000    
Building and Improvements, Initial Cost         2,047,000    
Acquisition Price         2,581,000    
Capitalized Improvements            
Land Cost, Total Cost         534,000    
Building & Improvements, Total Cost         2,047,000    
Total cost         2,581,000    
Accumulated Depreciation & Depreciation [1]         197,000    
Reserve for Impairment            
NBV Real Estate         2,384,000    
Model Home [Member] | Model Homes-DMH LP #202 [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         3,149,000    
Land, Initial Cost         741,000    
Building and Improvements, Initial Cost         4,238,000    
Acquisition Price         4,979,000    
Capitalized Improvements            
Land Cost, Total Cost         741,000    
Building & Improvements, Total Cost         4,238,000    
Total cost         4,979,000    
Accumulated Depreciation & Depreciation [1]         337,000    
Reserve for Impairment            
NBV Real Estate         4,642,000    
Model Home [Member] | Model Homes-DMH LP #203 [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         5,271,000    
Land, Initial Cost         1,600,000    
Building and Improvements, Initial Cost         7,132,000    
Acquisition Price         8,732,000    
Land Cost, Total Cost         1,600,000    
Building & Improvements, Total Cost         7,132,000    
Total cost         8,732,000    
Accumulated Depreciation & Depreciation [1]         441,000    
NBV Real Estate         8,291,000    
Model Home [Member] | Model Homes-DMH LP #204 [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         5,385,000    
Land, Initial Cost         1,412,000    
Building and Improvements, Initial Cost         6,787,000    
Acquisition Price         8,199,000    
Land Cost, Total Cost         1,412,000    
Building & Improvements, Total Cost         6,787,000    
Total cost         8,199,000    
Accumulated Depreciation & Depreciation [1]         345,000    
NBV Real Estate         7,854,000    
Model Home [Member] | Model Homes-DMH LP #205 [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         5,214,000    
Land, Initial Cost         1,461,000    
Building and Improvements, Initial Cost         6,287,000    
Acquisition Price         7,748,000    
Land Cost, Total Cost         1,461,000    
Building & Improvements, Total Cost         6,287,000    
Total cost         7,748,000    
Accumulated Depreciation & Depreciation [1]         179,000    
NBV Real Estate         7,569,000    
Model Home [Member] | Model Homes-DMH LP #206 [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         1,696,000    
Land, Initial Cost         294,000    
Building and Improvements, Initial Cost         2,181,000    
Acquisition Price         2,475,000    
Land Cost, Total Cost         294,000    
Building & Improvements, Total Cost         2,181,000    
Total cost         2,475,000    
Accumulated Depreciation & Depreciation [1]         27,000    
NBV Real Estate         2,448,000    
Model Home [Member] | Model Homes-NMH Inc. [Member]              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]              
Encumbrances         6,394,000    
Land, Initial Cost         1,510,000    
Building and Improvements, Initial Cost         8,190,000    
Acquisition Price         9,700,000    
Land Cost, Total Cost         1,510,000    
Building & Improvements, Total Cost         8,190,000    
Total cost         9,700,000    
Accumulated Depreciation & Depreciation [1]         378,000    
NBV Real Estate         $ 9,322,000    
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years
[2] Property held for sale as of December 31, 2020.