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Note 4 - Shareholders' Equity and Preferred Stock (Details Textual) - USD ($) | 2 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Stock Repurchased and Retired During Period, Shares (in shares) |  | 1,674,161 | 434,381 | 245,534
Stock Repurchased and Retired During Period, Value |  | $ 88,939,000 | $ 25,219,000 | $ 3,353,000
Own-share Lending Arrangement, Shares, Outstanding (in shares) |  |  | 1,459,233 |
Series B Preferred Stock [Member] |  |  |  |
Stock Repurchased and Retired During Period, Shares (in shares) |  | 3,500 |  |
Stock Repurchased and Retired During Period, Value |  | $ 69,000 |  |
Series B Preferred Stock [Member] | Public Offering [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 3,188,533 | 19,607 |  |
Preferred Stock, Dividend Rate, Percentage | 7.625% |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ 25.00 |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 76,500,000 | $ 400,000 |  |
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ 1.90625 |  |  |

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- Definition The number of shares outstanding as of the date of the statement of financial position in connection with an own-share lending arrangement entered into by the entity, in contemplation of a convertible debt offering or other financing. + References No definition available. + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21484-112644 + Details
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