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Note 10 - Common and Preferred Stock (Details Textual) |  |  |  |  | 12 Months Ended | 30 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2021 USD ($) | Jul. 01, 2021 USD ($) $ / shares shares | Jun. 29, 2021 $ / shares shares | Mar. 05, 2020 shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Jul. 02, 2026 $ / shares | Jan. 31, 2013 shares
Common Stock, Shares Authorized (in shares) |  |  |  |  | 85,000,000 | 70,000,000 | 85,000,000 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
Common Stock, Shares, Issued (in shares) |  |  |  |  | 66,710,795 | 55,823,810 | 66,710,795 |  |
Proceeds from Issuance of Common Stock | $ |  |  |  |  | $ 38,490,000 | $ 21,636,000 |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  |  |  |  |  |  | 400,000
Preferred Stock, Shares Issued, Total (in shares) |  |  |  |  | 329 | 329 | 329 |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 8.875% | 8.875% |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  | 100,000 | 100,000 | 100,000 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
Payments of Dividends | $ |  |  |  |  | $ 5,106,000 | $ 5,106,000 | $ 11,661,000 |  |
Common Stock, Shares, Outstanding (in shares) |  |  |  |  | 66,710,795 | 55,823,810 | 66,710,795 |  |
Preferred Class A [Member] |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) |  |  |  | 405.05 |  |  |  |  |
Series 1 Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  | 9,671 |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  | 3,917,235 |  |  |  |
Preferred Stock, Shares Issued, Total (in shares) |  |  |  |  | 329 |  | 329 |  |
Depository Shares [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Per Depository Share (in dollars per share) | $ / shares |  |  | $ 0.001 |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares |  | $ 25 |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share Per Year |  | 2.21875 |  |  |  |  |  |  |
Dividends Payable, Amount Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 0.56 |  | $ 0.56 |  |
Depository Shares [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 25 |
Depository Shares [Member] | Upon Change of Control [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares |  | $ 25 |  |  |  |  |  |  |
Depository Shares [Member] | Sale Including Overallotment Option [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 2,000,000 |  |  |  |  |  |
Sale Including Overallotment Option [Member] | Sale Including Overallotment Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 300,000 |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued, Total (in shares) |  |  |  |  | 2,300 | 2,300 | 2,300 |  |
Preferred Stock, Dividend Rate, Percentage | 8.875% | 8.875% | 8.875% |  | 8.875% | 8.875% |  |  |
Proceeds From Issuance of Preferred Stock, Net of Issuance Costs | $ | $ 54,000,000 |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  | 7,500 |  |  | 7,500 | 7,500 | 7,500 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  | $ 0.01 |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
Preferred Stock, Liquidation Preference, Value | $ |  | $ 25,000 |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share Per Year |  | 2,218.75 |  |  |  |  |  |  |
Dividends Payable, Amount Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 560 |  | $ 560 |  |
Conversion of Stock, Shares Cap (in shares) |  | 3,748.13 |  |  |  |  |  |  |
Series A Preferred Stock [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 25,000 |
Series A Preferred Stock [Member] | Upon Change of Control [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares |  | $ 25,000 |  |  |  |  |  |  |
Conversion of Convertible Senior Notes 2020 into Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  |  | 10,000 |  |  |  |  |
Water Project with Brownstein [Member] |  |  |  |  |  |  |  |  |
Costs and Expenses, Related Party | $ |  |  |  |  | $ 800,000 | $ 1,500,000 |  |  |
Certain Institutional and Individual Investors [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 10,500,000 | 11,857,140 |  |  |
Proceeds from Issuance of Common Stock | $ |  |  |  |  | $ 38,500,000 | $ 21,600,000 |  |  |

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