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Note 7 - Stockholders' Equity (Deficit) (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Expected term (years)
   
7
 
Expected volatility
   
55
%
Risk-free interest rate
   
2
%
Dividend rate
   
 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
 
 
Number of
Shares
 
 
Weighted
Average
Exercise
Price
 
 
Weighted
Average
Remaining
Contractual
Life
(in years)
 
 
 
Intrisic
Value
 
Balance at December 31, 2018
 
 
7,954
 
 
$
1,707.30
 
 
 
7.69
 
 
$
 
Options expired
 
 
(433
)
 
 
3,015.01
 
 
 
 
 
 
 
 
 
Options forfeited
 
 
(105
)
 
$
1,929.52
 
 
 
 
 
 
 
 
 
Balance at September 30, 2019
 
 
7,416
 
 
$
1,316.32
 
 
 
7.05
 
 
$
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exercisable at September 30, 2019
 
 
7,181
 
 
$
1,300.40
 
 
 
7.05
 
 
$
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Vested and expected to vest at September 30, 2019
 
 
7,416
 
 
$
1,316.32
 
 
 
7.05
 
 
$
 
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
   
 
 
Number of
Shares
   
Weighted
Average
Grant Date
Fair Value
   
Weighted
Average
Remaining
Contractual
Term
 
Awards outstanding at December 31, 2018
   
294,066
    $
17.34
     
3.1
 
Awarded
   
764,151
    $
1.24
     
 
 
Released
   
(96,444
)
  $
17.86
     
 
 
Forfeited
   
(20,205
)
  $
20.46
     
 
 
Awards outstanding at September 30, 2019
   
941,568
    $
4.15
     
2.0