Note 6 - Net Income (Loss) Per Share - Basic and Diluted Earnings Per Share (Details) - shares shares in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Shares used in basic earnings per share calculation (in shares)	40,305	40,719
Shares used in dilutive earnings per share calculation (in shares)	40,305	41,086
Share-Based Payment Arrangement, Option [Member]
Effect of dilutive securities (in shares)	0	367
Restricted Stock/Deferred Stock Units [Member]
Effect of dilutive securities (in shares)	0	367

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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