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Note 11 - Stockholders' Equity (Details Textual) |  | 6 Months Ended | 12 Months Ended | 63 Months Ended | 101 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 23, 2012 USD ($) shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2011 $ / shares shares | Jun. 30, 2020 USD ($) $ / 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 | $ 1,100,000 | $ 1,100,000 | $ 1,100,000 |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ / shares |  |  | $ 0.12 | $ 0.12 | $ 0.12 |  |
Registered Shares of Common Stock Pursuant to Dividend Reinvestment Plan (in shares) | 3,000,000 |  |  |  |  |  |
Common Stock, Percentage of Pruchase Price Per Share | 95.00% |  |  |  |  |  |
Payment of Sales, Commission or Dealer Manager Fee | $ | $ 0 |  |  |  |  |  |
Notice Period for Amendments to Dividend Reinvestment Plan (Day) | 30 days |  |  |  |  |  |
Dividend Reinvestments | $ |  |  |  | $ 0 |  |  |
Stock Issued During Period, Value, Dividend Reinvestment Plan | $ |  |  |  | $ 17,400,000 |  |  | $ 17,400,000
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares) |  | 0 |  | 917,074 |  |  | 917,074
Private Placement [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 10,000,000 |
Sale of Stock, Price Per Share (in dollars per share) | $ / shares |  | $ 19 |  |  |  | $ 20 | $ 19
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) |  | 8,925,036 |  | 8,881,842 | 8,860,711 |  | 8,925,036
Common Stock, Number of Entitled Votes |  |  |  | 1 |  |  |
Common Class C [Member] |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 9,000,000 |  | 9,000,000 |  |  | 9,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  |  |
Common Stock, Shares, Issued, Total (in shares) |  | 0 |  | 0 |  |  | 0
Common Stock, Number of Entitled Votes |  | 1 |  | 1 |  |  | 1
Common Class B [Member] |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 1,000 |  | 1,000 |  |  | 1,000
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) |  |  |  | 0 |  |  |
Common Stock, Number of Entitled Votes |  |  |  | 1 |  |  |

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