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Note 4 - Shareholders' Equity and Preferred Stock (Details Textual) - USD ($) |  | 2 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 27, 2019 | Jul. 31, 2021 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 29, 2023 | Aug. 10, 2022
Stock Repurchased and Retired During Period, Shares (in shares) |  |  | 49,203 | 105,447 | 67,236 | 177,801 |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 1,300,000 | $ 3,000,000 | $ 1,800,000 | $ 4,900,000 |  |
Proceeds from Issuance of Senior Long-Term Debt |  |  |  |  | 54,559,000 | 0 |  |
Maximum [Member] |  |  |  |  |  |  |  |
Common Stock Aggregate Offering Price |  |  |  |  |  |  | $ 50,000,000 |
Public Offering [Member] | Senior Notes 2026 [Member] |  |  |  |  |  |  |  |
Proceeds from Issuance of Senior Long-Term Debt |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |
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 |  |
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 | 2,100 | 44,143 | 53,427 |  |
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 |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.00% |  |  |  |  |  |  |
Series A Preferred Stock [Member] | Public Offering [Member] |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 6.00% |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) |  | $ 100 |  |  |  |  |  |
Common Shares [Member] | Public Offering [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 0 |  | 0 |  |  |

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