Note 5 - Net Income (Loss) Per Share - Basic and Diluted Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Basic (in shares)	40,284	40,786	40,311	40,689
Total effects of dilutive securities (in shares)	24	436	55	0
Shares used in dilutive earnings per share calculation (in shares)	40,308	41,222	40,366	40,689
Share-Based Payment Arrangement, Option [Member]
Effect of dilutive securities (in shares)	24	436	55	0
Restricted Stock/Deferred Stock Units [Member]
Effect of dilutive securities (in shares)	0	0	0	0