Note 11 - Preferred Stock (Details Textual) $ / shares in Thousands		12 Months Ended
	Aug. 19, 2021 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) shares
Stock Issued During Period, Shares, New Issues (in shares) | shares		995	153	4,981
Stock Issued During Period, Value, New Issues		$ 0	$ 0	$ 0
Preferred Stock, No Par Value (in dollars per share) | $ / shares		$ 0	$ 0
Proceeds from Issuance of Preferred Stock and Preference Stock		$ 0	$ 0	$ 110,927,000
Series A Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage	5.25%
Preferred Stock, No Par Value (in dollars per share) | $ / shares	$ 0
Preferred Stock, Liquidation Preference, Value	$ 1,000
Series A Preferred Stock [Member] | Underwritten Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	115,000
Stock Issued During Period, Value, New Issues	$ 115,000,000
Depositary Shares, Interest in Preferred Stock	0.025
Proceeds from Issuance of Preferred Stock and Preference Stock	$ 110,900,000