Note 5 - Stockholders' Equity and Dilutive Equity Instruments (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Feb. 27, 2025	Mar. 31, 2024
Share Repurchase Program [Member]
Share Repurchase Program, Authorized, Amount			$ 90.7	$ 90.3
Stock Repurchased and Retired During Period, Shares (in shares)		910,481	1,384,186
Stock Repurchased and Retired During Period, Value		$ 39.3	$ 90.7
Share Repurchase Program, Excise Tax, Percent		1.00%	1.00%
Share Repurchase Program [Member] | Subsequent Event [Member]
Share Repurchase Program, Excise Tax, Percent	1.00%
Stock Repurchased During Period, Shares (in shares)	1,379,723
Stock Repurchased During Period, Value	$ 50.8
Out-of-the-money Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)					782,993
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)					861,292
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)					1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 100