Note 14 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Aug. 31, 2021	Feb. 28, 2020
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
ATM Program [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.01
Sales of Stock Maximum Sales Price			$ 500.0
Stock Issued During Period, Shares, New Issues (in shares)	0
Common Stock Available for Issuance, Value	$ 422.4
Share Repurchase Program [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.01
Stock Repurchase Program, Authorized Amount				$ 300.0
Stock Repurchased During Period, Shares (in shares)	0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 224.9