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Note 4 - Shareholders' Equity and Preferred Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended		49 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jul. 31, 2024	Dec. 29, 2023	Aug. 10, 2022	Nov. 30, 2021
Stock Repurchased and Retired During Period, Shares (in shares)	41,381		49,203		68,633	67,236
Stock Repurchased and Retired During Period, Value	$ 1,900		$ 1,300		$ 3,200	$ 1,800
Proceeds from Issuance of Senior Long-Term Debt					25,282	54,559
Proceeds from Issuance of Common Stock					11,589	0
Senior Notes 2026 [Member]
Debt Instrument, Interest Rate, Stated Percentage											6.125%
Senior Notes 2026 [Member] | Public Offering [Member]
Debt Instrument, Interest Rate, Stated Percentage										6.125%
Proceeds from Issuance of Senior Long-Term Debt	0		0		0	0
Senior Notes 2029 [Member]
Debt Instrument, Interest Rate, Stated Percentage								9.25%
Senior Notes 2029 [Member] | Public Offering [Member]
Debt Instrument, Interest Rate, Stated Percentage										9.25%
Proceeds from Issuance of Senior Long-Term Debt	7,900		0		25,300	0
Proceeds from Issuance of Senior Long-Term Debt, Gross	$ 8,100		$ 0		$ 25,800	$ 0
Maximum [Member]
Common Stock Aggregate Offering Price									$ 50,000
Series B Preferred Stock [Member]
Stock Repurchased and Retired During Period, Shares (in shares)	0		0		0	0
Preferred Stock, Dividend Rate, Percentage					7.625%
Preferred Stock, Liquidation Preference Per Share (in dollars per share)	$ 25				$ 25		$ 25
Preferred Stock, Dividends Per Share, Declared (in dollars per share)	$ 0.48	$ 0.48	$ 0.48	$ 0.48
Series B Preferred Stock [Member] | Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	142,603		0		156,264	44,143
Proceeds from Issuance of Preferred Stock and Preference Stock	$ 3,200		$ 0		$ 3,500	$ 1,100
Series B Preferred Stock [Member] | Maximum [Member]
Preferred Stock, Aggregate Offering Price										$ 100,000
Series B Preferred Stock [Member] | O2021A Dividends [Member]
Preferred Stock, Dividends Per Share, Declared (in dollars per share)							$ 1.90625
Common Shares [Member] | Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	0		0		200,000	0
Proceeds from Issuance of Common Stock	$ 0		$ 0		$ 11,600	$ 0

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