Note 2 - Summary of Significant Accounting Policies - Basic and Diluted Earnings Per Share Computation (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Weighted average basic shares outstanding (in shares)	104,141	105,359	105,700
Effect of common stock equivalents (in shares)	1,135	1,234	1,066
Weighted average shares outstanding – diluted (in shares)	105,276	106,593	106,766