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Note 11 - Stockholders' Equity (Details Textual) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 104 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 23, 2012 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares | Dec. 31, 2016 | Sep. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2019 $ / shares shares
Preferred Stock, Shares Authorized (in shares) |  | 1,000,000 |  |  | 1,000,000 |  |  | 1,000,000 |
Maximum Individual Common Stock Ownership, Percentage |  | 9.80% |  |  | 9.80% |  |  | 9.80% |
Dividends, Common Stock, Cash | $ |  |  |  |  | $ 0 | $ 2,200,000 |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.12 |  |  |
Number of Real Estate Properties |  | 128 |  |  | 128 |  |  | 128 |
Number of Limited Partnerships in which Company is Sole General Partner |  |  |  |  |  |  | 1 |  |
Number of Limited Liability Companies |  |  |  |  |  |  | 4 |  |
Number of Put Options Exercised (in shares) |  |  |  |  | 2 |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  |  | $ 0 |  | $ 59,274 |  |  |  |
Registered Shares of Common Stock Pursuant to Dividend Reinvestment Plan (in shares) | 3,000,000 |  |  |  |  |  |  |  |
Common Stock, Percentage of Purchase Price Per Share | 95.00% |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | $ 19.00 |  |  |  |  |  |  |  |
Payment of Sales, Commission or Dealer Manager Fee | $ | $ 0 |  |  |  |  |  |  |  |
Notice Period for Amendments to Dividend Reinvestment Plan (Day) | 30 days |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Dividend Reinvestment Plan | $ |  |  |  |  |  |  |  | $ 17,400,000 |
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares) |  |  |  |  | 0 |  |  | 917,074 |
Share-based Payment Arrangement, Expense | $ |  | $ 181,000 |  | $ 193,000 | $ 542,000 | $ 809,000 |  |  |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Minority Interest, Decrease from Issuance of Stock for Limited Partnership Interests | $ |  |  | $ 1,247,990 |  | $ 1,200,000 |  |  |  |
Commercial Property [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |  |  |  |
Number of Real Estate Properties |  | 15 |  |  | 15 |  |  | 15 |
Commercial Property [Member] | Partially Owned Properties [Member] |  |  |  |  |  |  |  |  |
Number of Real Estate Properties |  | 2 |  |  | 2 |  |  | 2 |
Common Class A [Member] |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 100,000,000 |  |  | 100,000,000 |  |  | 100,000,000 | 100,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  | $ 0.01 |  |  | $ 0.01 |  |  | $ 0.01 | $ 0.01
Common Stock, Shares, Issued, Total (in shares) |  | 8,922,036 |  |  | 8,922,036 |  |  | 8,922,036 | 8,881,842
Common Class B [Member] |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 1,000 |  |  | 1,000 |  |  | 1,000 |
Common Stock, Shares, Issued, Total (in shares) |  | 0 |  |  | 0 |  |  | 0 |
Common Class C [Member] |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 9,000,000 |  |  | 9,000,000 |  |  | 9,000,000 |
Common Stock, Shares, Issued, Total (in shares) |  | 0 |  |  | 0 |  |  | 0 |
Common Stock, Number of Entitled Votes |  | 1 |  |  | 1 |  |  | 1 |

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