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Note 6 - Earnings (Loss) Per Share - Potentially Dilutive Securities Excluded from Diluted Net Income (Loss) 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
Total antidilutive share (in shares) 4,587 4,600 4,587 4,609
Share-Based Payment Arrangement, Option [Member]        
Total antidilutive share (in shares)   4   8
Restricted Stock Units (RSUs) [Member]        
Total antidilutive share (in shares)   9   14
Convertible Debt Securities [Member]        
Total antidilutive share (in shares) 4,587 4,587 4,587 4,587