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Note 2 - Stock-based Compensation - Stock Plan Activities (Details)
shares in Thousands
 3 Months Ended
Mar. 31, 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, Restricted stock unit awards granted (in shares) (13)
Awards available, Restricted stock unit awards cancelled (in shares)
Awards available, stock option awards granted (in shares) (15)
Options outstanding, stock option awards granted (in shares) 15
Weighted average exercise price, stock option awards granted (in dollars per share) | $ / shares $ 2.75
Options outstanding, stock option awards exercised (in shares)
Weighted average exercise price, stock option awards exercised (in dollars per share) | $ / shares
Awards available, stock option awards cancelled (in shares) 1,838
Options outstanding, stock option awards cancelled (in shares) (1,838)
Weighted average exercise price, stock option awards cancelled (in dollars per share) | $ / shares $ 6.90
Awards available, ending balance (in shares) 2,778
Options outstanding, ending balance (in shares) 19,227
Weighted average exercise price, ending balance (in dollars per share) | $ / shares $ 5.87
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, stock option awards granted (in shares) (759)
Options outstanding, stock option awards granted (in shares) 759
Weighted average exercise price, stock option awards granted (in dollars per share) | $ / shares $ 2.60
Options outstanding, stock option awards exercised (in shares)
Weighted average exercise price, stock option awards exercised (in dollars per share) | $ / shares
Awards available, stock option awards cancelled (in shares) 55
Options outstanding, stock option awards cancelled (in shares) (55)
Weighted average exercise price, stock option awards cancelled (in dollars per share) | $ / shares $ 6.53
Awards available, ending balance (in shares) 1,167
Options outstanding, ending balance (in shares) 2,033
Weighted average exercise price, ending balance (in dollars per share) | $ / shares $ 3.15
Awards available, plan amendment (in shares) 1,700