Note 10 - Other Assets - Mortgage Loans and Other Financing Receivables (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Face amount	$ 175.4	$ 25.0
Financing Receivable Maturing February 2029 [Member]
Face amount	$ 9.3
Interest rate	10.00%
Financing Receivable Maturing Between March 2029 and March 2034 [Member]
Face amount	$ 166.1
Collections	$ 38.2
Financing Receivable Maturing Between March 2029 and March 2034 [Member] | Minimum [Member]
Interest rate	6.35%
Financing Receivable Maturing Between March 2029 and March 2034 [Member] | Maximum [Member]
Interest rate	10.00%
Financing Receivable Maturing March 2029 [Member]
Face amount	$ 9.0
Interest rate	12.00%