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Note 9 - Net Loss Per Share - Antidilutive Securities Excluded From Computation of Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Antidilutive Securities (in shares) 1,163 370 1,192 1,182
Share-based Payment Arrangement, Option [Member]        
Antidilutive Securities (in shares) 231 192 253 466
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities (in shares) 803 178 736 460
Performance Shares [Member]        
Antidilutive Securities (in shares) 71 0 145 162
ESPP [Member]        
Antidilutive Securities (in shares) 58 0 58 94