Note 6 - Net Income (Loss) Per Share - Basic and Diluted Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Shares used in basic earnings per share calculation (in shares)	40,321	40,338
Total effects of dilutive securities (in shares)	0	0
Shares used in dilutive earnings per share calculation (in shares)	40,321	40,338
Share-Based Payment Arrangement, Option [Member]
Effect of dilutive securities (in shares)	0	0
Restricted Stock/Deferred Stock Units [Member]
Effect of dilutive securities (in shares)	0	0

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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