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Note 1 - Basis of Presentation - Stock Option Activity (Details) - Share-based Payment Arrangement, Option [Member]
shares in Thousands
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Outstanding (in shares) | shares 5,926
Outstanding, weighted average option exercise price (in dollars per share) $ 2.47
Outstanding, weighted average grant date fair value (in dollars per share) $ 1.75
Forfeited (in shares) | shares (315)
Forfeited, weighted average option exercise price (in dollars per share) $ 2.09
Forfeited, weighted average grant date fair value (in dollars per share) $ 1.53
Outstanding (in shares) | shares 5,611
Outstanding, weighted average option exercise price (in dollars per share) $ 2.49
Outstanding, weighted average grant date fair value (in dollars per share) $ 1.76