Note 5 - Derivatives and Other Hedging Instruments - Schedule of Interest Rate Swaps (Details) - Interest Rate Swap [Member] - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Notional amount	$ 3,136.8	$ 2,326.5
Average fixed pay rate	2.71%	2.24%
Average receive rate	5.40%	5.45%
Average maturity (Year)	6 years	5 years 10 months 24 days
One to Five Years [Member]
Notional amount	$ 1,200.0	$ 500.0
Average fixed pay rate	1.34%	0.84%
Average receive rate	5.45%	5.64%
Average maturity (Year)	3 years 7 months 6 days	2 years 8 months 12 days
More Than Five Years [Member]
Notional amount	$ 1,936.8	$ 1,826.5
Average fixed pay rate	3.56%	2.62%
Average receive rate	5.37%	5.40%
Average maturity (Year)	7 years 6 months	6 years 9 months 18 days