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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, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Aug. 10, 2022
Stock Repurchased and Retired During Period, Shares (in shares)					109,312				127,987
Stock Repurchased and Retired During Period, Value		$ 10,951,000	$ 12,861,000	$ 65,214,000	$ 5,193,000	$ 304,000	$ 297,000		$ 5,794,000
At Market Issuance Sales Agreement [Member]
Stock Sales Agreement, Maximum Amount										$ 100,000,000
Common Shares [Member]
Stock Repurchased and Retired During Period, Shares (in shares)		313,893						1,674,141
Stock Repurchased and Retired During Period, Value		$ 10,863,000						$ 88,938,000
Series B Preferred Stock [Member]
Stock Repurchased and Retired During Period, Shares (in shares)		3,500						3,500
Stock Repurchased and Retired During Period, Value		$ 70,000						$ 70,000
Series B Preferred Stock [Member] | Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	3,188,533	8,229
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	$ 200,000
Preferred Stock, Dividends Per Share, Declared (in dollars per share)	$ 1.90625

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