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Note 10 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended | 110 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 23, 2012 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) | Dec. 31, 2016 | Mar. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 $ / shares shares
Preferred Stock, Shares Authorized (in shares) |  | 1,000,000 |  |  | 1,000,000 |
Maximum Individual Common Stock Ownership, Percentage |  | 9.80% |  |  | 9.80% |
Payments of Dividends, Total | $ |  | $ 1,000 | $ 0 |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ / shares |  | $ 0.101 |  |  |  |
Number of Limited Liability Companies |  | 2 |  | 4 | 2 |
Number of Limited Partnerships in which Company is Sole General Partner |  |  |  | 1 |  |
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 | $ |  |  | $ 0 |  | $ 17,400 |
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares) |  |  |  |  | 917,074 |
Commercial Property [Member] |  |  |  |  |  |
Number of Real Estate Properties |  | 13 |  |  | 13 |
Commercial Property [Member] | Partially Owned Properties [Member] |  |  |  |  |  |
Number of Real Estate Properties |  | 2 |  |  | 2 |
Redeemable Convertible Preferred Stock Series B [Member] |  |  |  |  |  |
Preferred Stock, Shares Issued, Total (in shares) |  | 0 |  |  | 0 | 0
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  | 0 |  |  | 0 | 0
Common Class A [Member] |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 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
Common Stock, Shares, Issued, Total (in shares) |  | 9,508,363 |  |  | 9,508,363 | 9,508,363
Common Class B [Member] |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 1,000 |  |  | 1,000 |
Common Stock, Shares, Issued, Total (in shares) |  |  |  |  |  | 0
Common Class C [Member] |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 9,000,000 |  |  | 9,000,000 |
Common Stock, Shares, Issued, Total (in shares) |  | 0 |  |  | 0 |
Common Stock, Number of Entitled Votes |  | 1 |  |  | 1 |

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