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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).

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