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Note 4 - Shareholders' Equity and Preferred Stock (Details Textual) - USD ($) | 2 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2021 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Jul. 31, 2024 | Feb. 29, 2024 | Dec. 29, 2023 | Aug. 10, 2022 | Nov. 30, 2021
Stock Repurchased and Retired During Period, Shares (in shares) |  | 11,193 |  |  | 285,906 |  |  | 78,429 | 463,707 |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  | $ 300,000 |  |  | $ 9,400,000 |  |  | $ 2,100,000 | $ 14,300,000 |  |  |  |  |
Proceeds from Issuance of Senior Long-Term Debt |  |  |  |  |  |  |  | 124,076,000 | 0 |  |  |  |  |
Senior Notes 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.125%
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000
Senior Notes 2029 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 9.25% |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 60,000,000 | $ 57,200,000 |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Aggregate Offering Price |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
Public Offering [Member] | Senior Notes 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 6.125% |
Proceeds from Issuance of Senior Long-Term Debt |  | 0 |  |  | $ 0 |  |  | 0 | $ 0 |  |  |  |  |
Debt Instrument, Face Amount |  | 13,500,000 |  |  |  |  |  | $ 13,500,000 |  |  |  |  |  |
Public Offering [Member] | Senior Notes 2029 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 9.25% |
Proceeds from Issuance of Senior Long-Term Debt |  | $ 13,400,000 |  |  |  |  |  | $ 13,400,000 |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares (in shares) |  | 0 |  |  | 0 |  |  | 0 | 1,806 |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  | $ 0 |  |  |  | $ 29,000 |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared (in dollars per share) |  | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.48 |  |  |  |  |  |  |
Series B Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Aggregate Offering Price |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |
Series B Preferred Stock [Member] | O2021A Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ 1.90625 |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] | Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 3,188,533 | 0 |  |  | 300 |  |  | 44,143 | 53,727 |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 7.625% |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 76,500,000 | $ 0 |  |  | $ 0 |  |  | $ 1,100,000 | $ 1,100,000 |  |  |  |  |
Common Shares [Member] | Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  | 0 |  |  |  |  |  |

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