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Note 2 - Stock-based Compensation - Stock Plan Activities (Details)
shares in Thousands
 9 Months Ended
Sep. 30, 2020
$ / shares
shares
Incentive Plan [Member]  
Awards available, beginning balance (in shares) 968
Options outstanding, beginning balance (in shares) 21,050
Weighted average exercise price, beginning balance (in dollars per share) | $ / shares $ 5.96
Awards, available, Plan amendment (in shares) 8,000
Awards available, Restricted stock unit awards granted (in shares) (31)
Awards available, Restricted stock unit awards cancelled (in shares) 0
Awards available, stock option awards granted (in shares) (547)
Options outstanding, stock option awards granted (in shares) 547
Weighted average exercise price, stock option awards granted (in dollars per share) | $ / shares $ 4.86
Options outstanding, stock option awards exercised (in shares) (193)
Weighted average exercise price, stock option awards exercised (in dollars per share) | $ / shares $ 2.76
Awards available, stock option awards cancelled (in shares) 3,030
Options outstanding, stock option awards cancelled (in shares) (3,030)
Weighted average exercise price, stock option awards cancelled (in dollars per share) | $ / shares $ 6.90
Awards available, ending balance (in shares) 11,420
Options outstanding, ending balance (in shares) 18,374
Weighted average exercise price, ending balance (in dollars per share) | $ / shares $ 5.85
Inducement Plan [Member]  
Awards available, beginning balance (in shares) 171
Options outstanding, beginning balance (in shares) 1,329
Weighted average exercise price, beginning balance (in dollars per share) | $ / shares $ 3.60
Awards, available, Plan amendment (in shares) 2,900
Awards available, stock option awards granted (in shares) (2,338)
Options outstanding, stock option awards granted (in shares) 2,338
Weighted average exercise price, stock option awards granted (in dollars per share) | $ / shares $ 3.33
Options outstanding, stock option awards exercised (in shares) 0
Weighted average exercise price, stock option awards exercised (in dollars per share) | $ / shares $ 0
Awards available, stock option awards cancelled (in shares) 155
Options outstanding, stock option awards cancelled (in shares) (155)
Weighted average exercise price, stock option awards cancelled (in dollars per share) | $ / shares $ 4.20
Awards available, ending balance (in shares) 888
Options outstanding, ending balance (in shares) 3,512
Weighted average exercise price, ending balance (in dollars per share) | $ / shares $ 3.42