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Note 7 - Stock based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Number
of shares
    
Weighted-
Average
Exercise
Price
    
Weighted-
Average
Remaining
Contractual
Term
(in years)
    
Aggregate
Intrinsic
Value
(in
thousands)
  
Outstanding at December 31, 2016
    
1,129,582
     $
5.35
      
3.8
      
 
  
Cancelled/Forfeited
    
(258,706
 )    
4.10
      
 
      
 
  
Expired
    
(44,294
 )    
12.51
      
 
      
 
  
                                 
Outstanding at December 31, 2017
    
826,582
     $
5.35
      
2.8
      
 
  
                                 
Expired
 
 
(763,385
)
  
 
5.28
    
 
 
 
  
 
 
 
                                 
Outstanding at December 31, 2018
  
 
63,197
    
$
7.01
    
 
1.8
    
$
-
  
                                 
Exercisable at December 31, 2018
  
 
63,197
    
$
7.01
    
 
1.8
    
$
-
  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
   
Number
of shares
    
Weighted-
Average
Grant Date
Fair Value
  
Outstanding at December 31, 2016
    
544,024
     $
2.89
  
Vested
    
(569,263
 )    
2.20
  
Granted
    
458,081
      
1.26
  
Cancelled/Forfeited/Expired
    
(105,559
 )    
2.83
  
                 
Outstanding at December 31, 2017
    
327,283
     $
1.82
  
Vested
  
 
(182,732
)
  
 
2.02
  
Granted
  
 
161,290
    
 
0.62
  
Cancelled/Forfeited
/Expired
  
 
(101,266
)
  
 
1.55
  
                 
Outstanding at December 31,
201
8
  
 
204,575
    
$
0.83