Note 7 - Earnings Per Share - Shares Used to Calculate Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Weighted average number of shares used in computation of basic earnings per share: (in shares)	60,245	56,114	58,494	56,089
Additional shares from the assumed exercise of employee stock awards (in shares)	389	384	407	342
Weighted average number of shares used in computation of diluted earnings per share (in shares)	60,634	56,498	58,901	56,431