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Real Estate Assets (Summary of Properties Owned) (Detail) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Real Estate Assets Owned | $ 235,423,888 | $ 240,522,209 | $ 231,086,179
Havana Parker [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Jun. 01, 2006 |
Location |  | Aurora, CO |
Real Estate Assets Owned |  |  | 2,093,000
Garden Gateway Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Mar. 01, 2007 | Mar. 01, 2007 |
Location | Colorado Springs, Colorado | Colorado Springs, Colorado |
Real Estate Assets Owned | $ 11,529,000 | $ 11,656,000 | 11,808,000
World Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Sep. 01, 2007 | Sep. 01, 2007 |
Location | San Bernardino, California | San Bernardino, California |
Real Estate Assets Owned | $ 5,697,000 | $ 5,750,000 | 6,653,000
Regatta Square [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Oct. 01, 2007 |
Location |  | Denver, Colorado |
Real Estate Assets Owned |  | $ 1,836,000 | 1,859,000
Executive Office Park [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Jul. 01, 2008 | Jul. 01, 2008 |
Location | Colorado Springs, Colorado | Colorado Springs, Colorado |
Real Estate Assets Owned | $ 8,129,000 | $ 8,125,000 | 8,227,000
Waterman Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Aug. 01, 2008 | Aug. 01, 2008 |
Location | San Bernardino, California | San Bernardino, California |
Real Estate Assets Owned | $ 5,689,000 | $ 5,753,000 | 5,877,000
Pacific Oaks Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Sep. 01, 2008 | Sep. 01, 2008 |
Location | Escondido, California | Escondido, California |
Real Estate Assets Owned | $ 4,033,000 | $ 4,146,000 | 4,213,000
Morena Office Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Jan. 01, 2009 | Jan. 01, 2009 |
Location | San Diego, California | San Diego, California |
Real Estate Assets Owned | $ 4,973,000 | $ 5,079,000 | 5,269,000
Rangewood Medical Office Building [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | Mar. 01, 2009 |
Location |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  | $ 2,054,000 | 2,306,000
Genesis Plaza [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Aug. 01, 2010 | Aug. 01, 2010 |
Location | San Diego, California | San Diego, California |
Real Estate Assets Owned | $ 8,739,000 | $ 8,670,000 | 8,398,000
Dakota Bank Buildings [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | May 01, 2011 | May 01, 2011 |
Location | Fargo, North Dakota | Fargo, North Dakota |
Real Estate Assets Owned | $ 9,896,000 | $ 10,148,000 | 10,452,000
Bismarck Office Building [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Mar. 01, 2014 | Mar. 01, 2014 |
Location | Fargo, ND | Fargo, ND |
Real Estate Assets Owned | $ 5,551,000 | $ 5,392,000 | 4,904,000
Yucca Valley Retail Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Sep. 01, 2011 | Sep. 01, 2011 |
Location | Yucca Valley, California | Yucca Valley, California |
Real Estate Assets Owned | $ 6,635,000 | $ 6,738,000 | 7,190,000
Port of San Diego Complex [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Dec. 01, 2011 | Dec. 01, 2011 |
Location | San Diego, California | San Diego, California |
Real Estate Assets Owned | $ 14,026,000 | $ 14,153,000 | 13,971,000
Shoreline Medical Building [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired |  | May 01, 2012 |
Location |  | Half Moon Bay, California |
Real Estate Assets Owned |  | $ 5,821,000 | 5,856,000
The Presidio [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Nov. 01, 2012 | Nov. 01, 2012 |
Location | Aurora, Colorado | Aurora, Colorado |
Real Estate Assets Owned | $ 6,482,000 | $ 6,609,000 | 6,643,000
West Fargo Industrial [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Aug. 01, 2015 | Aug. 01, 2015 |
Location | Fargo, North Dakota | Fargo, North Dakota |
Real Estate Assets Owned | $ 7,536,000 | $ 7,632,000 | 2,875,000
300 N.P. [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Aug. 01, 2015 | Aug. 01, 2015 |
Location | Fargo, North Dakota | Fargo, North Dakota |
Real Estate Assets Owned | $ 3,704,000 | $ 3,751,000 | 7,833,000
Union Terrace [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Aug. 01, 2014 | Aug. 01, 2014 |
Location | Lakewood, Colorado | Lakewood, Colorado |
Real Estate Assets Owned | $ 8,412,000 | $ 8,276,000 | 8,607,000
One Park Centre [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Aug. 01, 2015 | Aug. 01, 2015 |
Location | Westminster, Colorado | Westminster, Colorado |
Real Estate Assets Owned | $ 8,547,000 | $ 8,515,000 | 13,245,000
Centennial Technology Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Dec. 01, 2014 | Dec. 01, 2014 |
Location | Colorado Springs, Colorado | Colorado Springs, Colorado |
Real Estate Assets Owned | $ 13,748,000 | $ 14,157,000 | 14,755,000
Highland Court [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Aug. 01, 2015 | Aug. 01, 2015 |
Location | Centennial, Colorado | Centennial, Colorado |
Real Estate Assets Owned | $ 12,430,000 | $ 12,511,000 | 9,050,000
Arapahoe Service Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Dec. 01, 2014 | Dec. 01, 2014 |
Location | Centennial, Colorado | Centennial, Colorado |
Real Estate Assets Owned | $ 10,917,000 | $ 11,207,000 | 11,301,000
Shea Center II [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Dec. 01, 2015 | Dec. 01, 2015 |
Location | Highlands Ranch, Colorado | Highlands Ranch, Colorado |
Real Estate Assets Owned | $ 23,705,000 | $ 24,409,000 | 25,961,000
Union Town Center [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Dec. 01, 2014 | Dec. 01, 2014 |
Location | Colorado Springs, Colorado | Colorado Springs, Colorado |
Real Estate Assets Owned | $ 10,382,000 | $ 10,544,000 | 10,941,000
NetREIT, Inc. Properties [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Real Estate Assets Owned | $ 193,494,000 | $ 205,708,000 | 214,197,000
Research Parkway [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Aug. 01, 2015 | Aug. 01, 2015 |
Location | Colorado Springs, Colorado | Colorado Springs, Colorado |
Real Estate Assets Owned | $ 2,734,000 | $ 2,776,000 | 3,910,000
Model Home Properties [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Real Estate Assets Owned | $ 41,930,000 | $ 34,814,000 | $ 16,889,000
Model Home Properties [Member] | Minimum [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Jan. 01, 2010 | Jan. 01, 2011 |
Model Home Properties [Member] | Maximum [Member] |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Date acquired | Jan. 01, 2017 | Jan. 01, 2016 |

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