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Note 18 - Preferred Stock, Common Stock and Convertible Unit Transactions - Preferred Stock Repurchased (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Shares repurchased (in shares) | 761,149 | 567,450 | 1,084,953
Purchase price | $ 1,491,000 | $ 3,441,000 | $ (0)
Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member] |  |  |
Shares repurchased (in shares) | 43,777 |  |
Purchase price | $ 973,400 |  |
Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member] |  |  |
Shares repurchased (in shares) | 23,791 |  |
Purchase price | $ 515,900 |  |

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