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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for accounts receivable	$ 0.5	$ 0.5
Held-to-maturity, allowance for credit loss	$ 0.4	$ 0.6
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	50,000,000	50,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	300,000,000	300,000,000
Common stock, shares issued (shares)	43,408,407	43,228,172
Common stock shares outstanding (shares)	36,989,048	37,298,989
Treasury stock (shares)	6,419,359	5,929,183

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Amount of allowance for credit loss on accounts receivable, classified as current.

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