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Mortgage Notes Payable (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Mortgage notes payable $ 161,781,671 $ 160,828,604 $ 144,690,570
Unamortized loan costs (1,829,607) (1,942,493) (2,052,169)
Mortgage notes payable, net 159,952,064 158,886,111 142,638,401
Executive Office Park [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable [1] $ 4,191,082 $ 4,231,842 4,307,975
Fixed interest rate on mortgage (in hundredths) 5.80% [2] 5.80% [3]  
Maturity date Jul. 01, 2025 Jul. 01, 2025  
Rangewood Medical Office Building [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable   $ 958,106 1,027,085
Fixed interest rate on mortgage (in hundredths) 4.95% [2] 4.95% [3]  
Maturity date Jan. 01, 2019 Jan. 01, 2019  
Regatta Square [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable   $ 1,150,566 1,183,473
Fixed interest rate on mortgage (in hundredths) 4.95% [2] 4.95% [3]  
Maturity date Jan. 01, 2019 Jan. 01, 2019  
Garden Gateway Plaza [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 6,537,121 $ 6,626,739 6,799,229
Fixed interest rate on mortgage (in hundredths) 5.00% [2] 5.00% [3]  
Maturity date Feb. 05, 2020 Apr. 05, 2020  
Port of San Diego Complex [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 9,715,579 $ 9,852,456 10,097,726
Fixed interest rate on mortgage (in hundredths) 4.75% [2] 4.75% [3]  
Maturity date Mar. 05, 2020 Mar. 05, 2020  
West Fargo Industrial [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 4,400,178 $ 4,434,655 4,500,000
Fixed interest rate on mortgage (in hundredths) 4.79% [2] 4.79% [3]  
Maturity date Aug. 04, 2020 Aug. 04, 2020  
Morena Office Center [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 2,190,482 [4] $ 2,224,839 [4],[5] 2,289,899 [5]
Fixed interest rate on mortgage (in hundredths) 4.50% [2] 4.50% [3]  
Maturity date Jan. 01, 2021 Jan. 01, 2021  
Waterman Plaza [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 3,893,565 $ 3,939,037 [6]  
Fixed interest rate on mortgage (in hundredths) 4.25% [2] 4.25% [3]  
Maturity date Apr. 29, 2021 Apr. 29, 2021  
Pacific Oaks Plaza [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 1,489,478 $ 1,512,640 1,556,891
Fixed interest rate on mortgage (in hundredths) 4.50% [2] 4.50% [3]  
Maturity date Jun. 01, 2021 Jun. 01, 2021  
The Presidio [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 6,000,000 $ 6,000,000 6,000,000
Fixed interest rate on mortgage (in hundredths) 4.54% [2] 4.54% [3]  
Maturity date Dec. 01, 2021 Dec. 01, 2024  
Shoreline Medical Building [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable [5]   $ 3,602,238 3,727,569
Fixed interest rate on mortgage (in hundredths) 5.10% [2] 5.10% [3]  
Maturity date Jun. 01, 2022 Jun. 01, 2022  
Highland Court [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 6,763,082 $ 6,829,348 6,958,147
Fixed interest rate on mortgage (in hundredths) 3.82% [2] 3.82% [3]  
Maturity date Sep. 01, 2022 Aug. 28, 2022  
Dakota Bank Buildings [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 10,584,434 $ 10,677,761 10,825,201
Fixed interest rate on mortgage (in hundredths) 4.74% [2] 4.74% [3]  
Maturity date Jul. 06, 2024 Jul. 06, 2024  
Union Terrace [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 6,505,946 $ 6,558,704 6,600,000
Fixed interest rate on mortgage (in hundredths) 4.50% [2] 4.50% [3]  
Maturity date Sep. 05, 2024 Sep. 05, 2024  
Centennial Technology Center [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 9,991,836 $ 10,077,242 10,237,591
Fixed interest rate on mortgage (in hundredths) 4.34% [2] 4.34% [3]  
Maturity date Nov. 05, 2024 Jan. 05, 2025  
Research Parkway [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 1,932,815 $ 1,956,154  
Fixed interest rate on mortgage (in hundredths) 3.94% [2] 3.94% [3]  
Maturity date Jan. 05, 2025 Jan. 05, 2025  
Arapahoe Service Center [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 8,431,261 $ 8,500,000 8,500,000
Fixed interest rate on mortgage (in hundredths) 4.34% [2] 4.34% [3]  
Maturity date Jan. 05, 2025 Jan. 05, 2025  
Union Town Center [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 8,440,000 $ 8,440,000 8,440,000
Fixed interest rate on mortgage (in hundredths) 4.28% [2] 4.28% [3]  
Maturity date Jan. 05, 2025 Jan. 05, 2025  
Yucca Valley Retail Center [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 6,000,000 $ 6,000,000 6,000,000
Fixed interest rate on mortgage (in hundredths) 4.30% [2] 4.30% [3]  
Maturity date Apr. 11, 2025 Apr. 11, 2025  
Genesis Plaza [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 6,500,000 $ 6,610,000 6,500,000
Fixed interest rate on mortgage (in hundredths) 4.65% [2] 4.65% [3]  
Maturity date Aug. 25, 2025 Aug. 25, 2025  
One Park Centre [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 6,610,000 $ 6,500,000 6,610,000
Fixed interest rate on mortgage (in hundredths) 4.77% [2] 4.77% [3]  
Maturity date Sep. 05, 2025 Sep. 05, 2025  
Shea Center II [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 17,727,500 $ 17,727,500 17,727,500
Fixed interest rate on mortgage (in hundredths) 4.92% [2] 4.92% [3]  
Maturity date Jan. 05, 2026 Jan. 05, 2026  
Bismarck Office Building [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 4,108,883 [7] $ 4,158,998 [7],[8] 3,252,016 [8]
Fixed interest rate on mortgage (in hundredths) 4.02% [2] 4.02% [3]  
Maturity date Aug. 01, 2037 Aug. 01, 2037  
300 N.P. [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 2,397,089    
Fixed interest rate on mortgage (in hundredths) [2] 4.02%    
Maturity date Aug. 01, 2037    
Model Home Properties [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 27,371,340 $ 22,259,779 9,050,268
Model Home Properties [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate on mortgage (in hundredths) 3.80% 3.80%  
Maturity date Jan. 01, 2017 [9] Jan. 01, 2016 [10]  
Model Home Properties [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Fixed interest rate on mortgage (in hundredths) 5.50% 5.50%  
Maturity date Jan. 01, 2020 [9] Jan. 01, 2020 [10]  
NetREIT, Inc. Properties [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 134,410,331 $ 138,568,825 135,640,302
Fixed interest rate on mortgage (in hundredths) 4.71% [2] 4.71% [3]  
Havana Parker [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable     $ 2,500,000
Fixed interest rate on mortgage (in hundredths) [3]   6.51%  
Maturity date   Jul. 01, 2016  
[1] Interest rate is subject to reset on July 1, 2018.
[2] Interest rates as of June 30, 2017.
[3] Interest rates as of December 31, 2016.
[4] Interest rate is subject to reset on the 6th loan anniversary.
[5] Interest rate subject to resetting on the 6th loan anniversary.
[6] Interest rate is subject to reset on April 28, 2017.
[7] Interest rate is subject to reset on September 1, 2023 and on September 1, 2030.
[8] Interest rate is subject to reset on September 1, 2023.
[9] Each Model Home has a stand-alone mortgage note at interest rates ranging from 3.8% to 5.5% per annum (at June 30, 2017).
[10] Each Model Home has a standalone mortgage note at interest rates ranging from 3.8% to 5.5% (at December 31, 2016).