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Note 7 - Mortgage Notes Payable - Mortgage Notes Payable 1 (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Mortgage Notes Payable, net $ 125,530,928 $ 142,392,992 $ 149,714,176
Mortgage Notes [Member]      
Mortgage Notes Payable 126,442,100 143,459,048 151,140,916
Unamortized loan costs (911,172) (1,066,056) (1,426,740)
Garden Gateway Plaza [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 5,967,727 [1] $ 6,071,315 [1],[2] 6,270,896 [2]
Interest rate 5.00% [1],[3] 5.00% [2],[4]  
Maturity date Aug. 05, 2021 [1] Feb. 05, 2020  
Interest rate 5.00% [1],[3] 5.00% [2],[4]  
World Plaza [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 5,854,222 [1],[5] $ 4,979,383 [1],[5],[6] 3,350,539 [6]
Maturity date Jul. 05, 2021 [1],[5] Jul. 05, 2020  
Interest rate, variable 4.40% [1],[3],[5] 5.10% [4],[6]  
West Fargo Industrial [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 4,177,324 $ 4,216,565 4,292,809
Interest rate 4.79% [3] 4.79% [4]  
Maturity date May 31, 2029 Sep. 06, 2020  
Interest rate 4.79% [3] 4.79% [4]  
Morena Office Center [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable [7]   1,567,358
Interest rate [4],[7]   430.00%  
Maturity date   Jun. 01, 2021  
Interest rate [4],[7]   430.00%  
Waterman Plaza [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 3,247,878 [8] $ 3,274,097 [8] 3,369,960
Interest rate [4]   5.78%  
Maturity date Apr. 29, 2021 [8] Apr. 29, 2021  
Interest rate, variable [3],[8] 4.25%    
Interest rate [4]   5.78%  
The 300 N.P [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 2,292,848 $ 2,311,738 2,348,443
Interest rate 4.95% [3] 4.95% [4]  
Maturity date Jun. 11, 2022 Jun. 11, 2022  
Interest rate 4.95% [3] 4.95% [4]  
Highland Court [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 6,350,303 $ 6,424,366 6,568,320
Interest rate 3.82% [3] 3.82% [4]  
Maturity date Sep. 01, 2022 Sep. 01, 2022  
Interest rate 3.82% [3] 3.82% [4]  
Dakota Center [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 10,007,257 $ 10,111,693 10,314,520
Interest rate 4.74% [3] 4.74% [4]  
Maturity date Jul. 06, 2024 Jul. 06, 2024  
Interest rate 4.74% [3] 4.74% [4]  
Union Terrace [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable [9] $ 6,240,396 [9] 6,354,153
Interest rate 4.50% [3],[9] 4.50% [4]  
Maturity date Sep. 05, 2024 [9] Sep. 05, 2024  
Interest rate 4.50% [3],[9] 4.50% [4]  
The Presidio [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable   5,992,905
Interest rate [4]   4.54%  
Maturity date   Dec. 01, 2021  
Interest rate [4]   4.54%  
Centennial Tech Center [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable [9] $ 9,561,654 [9],[10] 9,745,811 [10]
Interest rate 4.43% [3],[9] 4.43% [4],[10]  
Maturity date Jan. 05, 2024 [9] Jan. 05, 2024  
Interest rate 4.43% [3],[9] 4.43% [4],[10]  
Research Parkway [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 1,787,129 $ 1,813,305 1,864,139
Interest rate 3.94% [3] 3.94% [4]  
Maturity date Jan. 05, 2025 Jan. 05, 2025  
Interest rate 3.94% [3] 3.94% [4]  
Arapahoe Center [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 8,009,836 $ 8,085,727 8,233,567
Interest rate 4.34% [3] 4.34% [4]  
Maturity date Jan. 05, 2025 Jan. 05, 2025  
Interest rate 4.34% [3] 4.34% [4]  
Union Town Center [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 8,406,185 $ 8,440,000 8,440,000
Interest rate 4.28% [3] 4.28% [4]  
Maturity date Jan. 05, 2025 Jan. 05, 2025  
Interest rate 4.28% [3] 4.28% [4]  
Executive Office Park [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 4,783,471 [1] $ 4,839,576 [1] 4,947,808
Interest rate 4.83% [1],[3] 4.83% [4]  
Maturity date Jun. 01, 2027 [1] Jun. 01, 2027  
Interest rate 4.83% [1],[3] 4.83% [4]  
Genesis Plaza [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 6,327,800 $ 6,378,110 6,476,032
Interest rate 4.71% [3] 4.71% [4]  
Maturity date Sep. 06, 2025 Aug. 25, 2025  
Interest rate 4.71% [3] 4.71% [4]  
One Park Centre [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 6,436,968 $ 6,487,532 6,585,922
Interest rate 4.77% [3] 4.77% [4]  
Maturity date Sep. 05, 2025 Sep. 05, 2025  
Interest rate 4.77% [3] 4.77% [4]  
Shea Center II [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 17,727,500 $ 17,727,500 17,727,500
Interest rate 4.92% [3] 4.92% [4]  
Maturity date Jan. 05, 2026 Jan. 05, 2026  
Interest rate 4.92% [3] 4.92% [4]  
Grand Pacific Center [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable $ 3,795,623 [11] $ 3,851,962 [11],[12] 3,961,304 [12]
Interest rate 4.02% [3],[11] 4.02% [4],[12]  
Maturity date Aug. 01, 2037 [11] Aug. 01, 2037  
Interest rate 4.02% [3],[11] 4.02% [4],[12]  
Office/Industrial and Retail Properties [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable   $ 110,814,919 118,411,986
Model Home Properties [Member] | Mortgage Notes [Member]      
Mortgage Notes Payable   $ 32,644,129 $ 32,728,930
Interest rate [4],[13]    
Interest rate [4],[13]    
[1] Properties held for sale as of June 30, 2020. Only one of the four buildings at Executive Office Park was classified as held for sale. There are four model homes included as held for sale.
[2] The maturity date of the mortgage loan was extended to August 5, 2021.
[3] Interest rates as of June 30, 2020.
[4] Interest rates as of December 31, 2019.
[5] Interest rate is subject to reset on September 1, 2023.
[6] Interest on this loan is ABR + 0.75% and LIBOR plus 2.75% For the year-ended December 31, 2019, the weighted average interest rate was 5.04%.
[7] Morena Office Center sold on January 15, 2019.
[8] Interest on this loan resets annually at LIBOR plus 3.00%, with a floor of 4.25%.
[9] Centennial Tech Center and Union Terrace were sold on February 5, 2020 and March 13, 2020, respectively.
[10] Centennial Tech Center was held for sale as of December 31, 2019 and sold for approximately $15.0 million on February 5, 2020.
[11] Interest on this loan is alternative base rate plus 0.75% and LIBOR plus 2.75%. For the six months ended June 30, 2020, the weighted average interest rate was 4.40%.
[12] Interest rate is subject to reset on September 1, 2023.
[13] Each Model Home has a stand-alone mortgage note at interest rates ranging from 3.8% to 5.6% (at December 31, 2019).