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Note 11 - Share-based Compensation - Restricted Stock Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Forfeited, number of options (in shares) (257,000)  
Forfeited, weighted average grant-date fair value (in dollars per share)  
Restricted Stock Units (RSUs) [Member]    
Unvested, number of units (in shares) 3,394,370 3,831,965
Unvested, weighted average grant-date fair value (in dollars per share) $ 8.03 $ 7.95
Granted, number of units (in shares) 1,663,532 2,275,094
Granted, weighted average grant-date fair value (in dollars per share) $ 2.03 $ 4.82
Vested and delivered, number of units (in shares) (1,433,268) (1,549,050)
Vested and delivered, weighted average grant-date fair value (in dollars per share) $ 3.59 $ 3.97
Withheld as treasury stock, number of units (in shares) [1] (219,795) (567,447)
Withheld as treasury stock, weighted average grant-date fair value (in dollars per share) [1] $ 4.06 $ 4.13
Vested not delivered, number of units (in shares) [2] 525,334 122,582
Vested not delivered, weighted average grant-date fair value (in dollars per share) [2] $ 2.84 $ 4.76
Forfeited, number of options (in shares) (553,076) (718,774)
Forfeited, weighted average grant-date fair value (in dollars per share) $ 3.47 $ 4.13
Unvested, number of units (in shares) 3,377,097 3,394,370
Unvested, weighted average grant-date fair value (in dollars per share) $ 7.09 $ 8.03
[1] As discussed in Note 10, Common stock, treasury stock and warrants, the increase in treasury stock was primarily attributable to shares withheld to cover statutory withholding taxes upon the vesting of RSUs. As of December 31, 2020 and 2019, there were 3,945,867 and 2,768,399 outstanding shares of treasury stock, respectively.
[2] Vested not delivered represents vested RSUs with delivery deferred to a future time. During the year ended December 31, 2020, there was a net decrease of 525,334 shares included in vested not delivered balance as a result of the delivery of 655,333 shares, partially offset by the vesting of 129,999 shares with deferred delivery election. During the year ended December 31, 2019,there was a net decrease of 122,582 shares included in vested not delivered balance as a result of the delivery of 740,334 shares, partially offset by the vesting of 617,752 shares with deferred delivery election. As of December 31, 2020 and 2019, there were 2,262,001 and 2,787,335 outstanding RSUs included in vested not delivered, respectively.