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Note 5 - Equity Awards
 12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Stockholders' Equity Note Disclosure [Text Block]
5.
Equity Awards
 
Warrants
 
In connection with sales of the Company's common stock and the issuance of debt instruments that have since been repaid, warrants were issued. The warrants expire between
one
and
seven
years from issuance from the date of grant and are subject to the terms applicable in each agreement. The following table sets forth the changes in the number of warrants outstanding for the periods presented:
 
   
Number of Warrants
    
Weighted Average Exercise Price
  
Outstanding at December 31, 2017
    
710,174
     $
8.95
  
Exercised
    
(18,405
 )    
3.00
  
Forfeited, Canceled
    
(163,715
 )    
3.34
  
Outstanding at December 31, 2018
    
528,054
      
10.90
  
Forfeited, Canceled
    
(200,801
 )    
14.18
  
Outstanding at December 31, 2019
    
327,253
     $
8.89
  
 
Equity Incentive Plan
 
The following is a summary of option award activity under the Plan for the year ended
December 
31,
2019
:
 
   
Year ended December 31, 2019
  
   
Total Stock Options Outstanding
    
Weighted Average Exercise Price per Share
    
Nonvested Stock Options
    
Weighted Average Grant Date Fair Value per Share
  
December 31, 2018
    
160,076
     $
35.92
      
—
     $
—
  
Forfeited, Canceled
    
(23,971
 )    
12.35
      
—
      
—
  
December 31, 2019
    
136,105
     $
40.07
      
—
     $
—
  
  
The following is a summary of outstanding stock options under the Plan as of
December 
31,
2019
:
 
   
Stock Options Outstanding
    
Vested Stock Options
  
Quantity
    
136,105
      
136,105
  
Weighted-average exercise price
   $
40.07
     $
40.07
  
Weighted Average Remaining Contractual Term (in Years)
    
3.46
      
3.46
  
Intrinsic value
   $
—
     $
—
  
    
For the years ended
December 
31,
 
2019
and
2018
, the Company granted
no
stock options. For the years ended
December 
31,
 
2019
and
2018
, the total fair value of options vested was
$0.
The total intrinsic value of options exercised for the years ended
December 
31,
 
2019
and 
2018
was
$0.
 
As of
December 
31,
2019
, there was
no
total compensation cost
not
yet recognized related to unvested stock options.