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Note 7 - Convertible Senior Notes (Details Textual) $ / shares in Units, $ in Millions				3 Months Ended			6 Months Ended
	Sep. 04, 2025 $ / shares	Mar. 27, 2025	Dec. 19, 2024 USD ($) $ / shares	Jun. 30, 2025 USD ($) $ / shares	Dec. 31, 2024 USD ($) $ / shares	Jun. 30, 2024 $ / shares	Jun. 30, 2025 USD ($) $ / shares	Jun. 30, 2024 $ / shares	Mar. 28, 2025 $ / shares
Common Stock, Dividends, Per Share, Declared \| $ / shares				$ 0.2		$ 0.16	$ 0.4	$ 0.32
O 2025 Q2 Dividends [Member]
Common Stock, Dividends, Per Share, Declared \| $ / shares				$ 0.2
O 2024 Q4 Dividends [Member]
Common Stock, Dividends, Per Share, Declared \| $ / shares					$ 0.16
O 2024 Q4 Dividends [Member] \| Forecast [Member]
Common Stock, Dividends, Per Share, Declared \| $ / shares	$ 0.16
O 2025 Q3 Dividends [Member] \| Forecast [Member]
Common Stock, Dividends, Per Share, Declared \| $ / shares	$ 0.2
Convertible Senior Notes [Member] \| U S Bank Trust Company, National Association [Member]
Debt Instrument, Face Amount \| $			$ 172.5
Proceeds from Notes Payable \| $			167.7
Payments of Debt Issuance Costs \| $			$ 4.8
Debt Instrument, Interest Rate, Stated Percentage			2.50%	2.50%			2.50%
Debt Instrument, Convertible, Conversion Ratio		8.3602	8.3521
Debt Instrument, Convertible, Conversion Price \| $ / shares			$ 119.73						$ 119.61
Interest Expense, Debt \| $							$ 2.2
Amortization of Debt Issuance Costs \| $							0.4
Long-Term Debt, Fair Value \| $				$ 172.7	$ 178.6		$ 172.7