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Note 4 - Shareholders' Equity and Preferred Stock (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Stock Repurchased and Retired During Period, Shares (in shares) | 105,447 |  | 355,036 |  | 177,801 | 1,360,248
Stock Repurchased and Retired During Period, Value | $ 2,988,000 |  | $ 12,861,000 | $ 65,214,000 | $ 4,935,000 | $ 78,075,000
Series B Preferred Stock [Member] |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares (in shares) | 0 |  | 0 |  | 1,806 | 0
Stock Repurchased and Retired During Period, Value | $ 0 | $ 29,000 | $ 0 |  |  | $ 0
Series B Preferred Stock [Member] | Public Offering [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 2,100 |  | 0 |  | 53,427 | 0
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 0.0 |  | $ 1,100,000 |  | $ 0.0 | $ 0.0

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