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Note 10 - Stockholders' Equity (Details Textual) |  |  |  |  | 4 Months Ended | 12 Months Ended | 131 Months Ended |  |  |  |  |
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Jul. 12, 2021 $ / shares shares | Jun. 17, 2021 USD ($) shares | Jun. 17, 2021 USD ($) shares | Jun. 15, 2021 USD ($) $ / shares shares | Jan. 23, 2012 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Sep. 15, 2022 USD ($) | Jan. 24, 2022 $ / shares | Jan. 21, 2022 $ / shares | Sep. 17, 2021 USD ($) | Aug. 31, 2021 $ / shares shares
Preferred Stock, Shares Authorized (in shares) | shares |  |  |  |  |  |  | 1,000,000 |  | 1,000,000 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 19.00 |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  |  |  |  |  |  | $ 0 | $ 20,489,803 |  |  |  |  |  |
Maximum Individual Common Stock Ownership, Percentage |  |  |  |  |  |  | 9.80% |  | 9.80% |  |  |  |  |
Number of Limited Partnerships in which Company is Sole General Partner |  |  |  |  |  |  | 5 |  |  |  |  |  |  |
Registered Shares of Common Stock Pursuant to Dividend Reinvestment Plan (in shares) | shares |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |
Common Stock, Percentage of Purchase 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 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Dividend Reinvestment Plan | $ |  |  |  |  |  |  |  |  | $ 17,400,000 |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares) | shares |  |  |  |  |  |  |  |  | 917,074 |  |  |  |  |
Commercial Property [Member] | Partially Owned Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |
Class A Common Stock and Accompanying Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | $ 5.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock and Accompanying Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | $ 4.99 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 5.50 |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.50
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |  |  |  |  |  |  |  |  |  | 5 years
Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01
Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.25
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years
Class of Warrant or Right, Securities Called By Warrants or Rights, Percentage of Class of Stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00%
Common Stock Warrants and Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) | shares |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 7.00 |  | $ 7.00 |  | $ 0.17 | $ 7.00 |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) | shares |  |  |  |  |  | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares |  | 920,000 | 920,000 | 800,000 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  | $ 20,500,000 | $ 20,500,000 | $ 18,100,000 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 9.375% |  |  | 9.375% |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares |  |  |  |  |  | $ 25.00 | $ 25.00 | $ 25.00 | $ 25.00 |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 2.34375 |  |  |  |  |  |  |
Preferred Stock, Number of Board of Directors Entitled to Vote if Dividends not Paid for 18 Monthly Dividend Periods |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |
Preferred Stock, Percentage of Outstanding Shares Required to Authorize Senior Ranking Stock |  |  |  |  |  |  | 66.67% |  | 66.67% |  |  |  |  |
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 25.00 |  | $ 25.00 |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 2.34372 | $ 1.27603 |  |  |  |  |  |
Payments of Dividends, Total | $ |  |  |  |  |  |  | $ 2,200,000 | $ 1,200,000 |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ |  |  |  |  |  |  |  |  |  | $ 4,000,000.0 |  |  |  |
Stock Repurchased During Period, Shares (in shares) | shares |  |  |  |  |  |  | 6,013 |  |  |  |  |  |  |
Stock Repurchased, Average Cost Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 20.31 |  |  |  |  |  |  |
Stock Repurchased, Commission Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.035 |  |  |  |  |  |  |
Stock Repurchased During Period, Value | $ |  |  |  |  |  |  | $ 122,141 |  |  |  |  |  |  |
Series D Preferred Stock [Member] | Monthly Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.19531 |  |  |  |  |  |  |
Series D Preferred Stock [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares |  | 120,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Option to Purchase Additional Shares, Period (Day) |  |  |  | 45 days |  |  |  |  |  |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Dividends, Total | $ |  |  |  |  |  |  | $ 3,100,000 | $ 4,500,000 |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) | 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) | shares |  |  |  |  |  | 11,599,720 | 11,655,583 | 11,599,720 | 11,655,583 |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ |  |  |  |  |  |  |  |  |  | $ 6,000,000.0 |  |  | $ 10,000,000 |
Stock Repurchased During Period, Shares (in shares) | shares |  |  |  |  |  |  | 196,631 | 29,721 |  |  |  |  |  |
Stock Repurchased, Average Cost Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 1.59 | $ 3.7223 |  |  |  |  |  |
Stock Repurchased, Commission Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.035 | $ 0.035 |  |  |  |  |  |
Stock Repurchased During Period, Value | $ |  |  |  |  |  | $ 110,631 | $ 313,578 |  |  |  |  |  |  |
Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) | shares |  |  |  |  |  |  | 1,000 |  | 1,000 |  |  |  |  |
Common Class C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) | shares |  |  |  |  |  |  | 9,000,000 |  | 9,000,000 |  |  |  |  |
Common Stock, Shares, Issued, Total (in shares) | shares |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |
Common Stock, Number of Entitled Votes |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21484-112644 + Details
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