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Note 6 - Stock based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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, 201
5
    
1,166,192
     $
5.93
      
4.7
      
 
  
Expired
    
(36,610
 )    
23.88
      
 
      
 
  
                                 
Outstanding at December 31, 201
6
    
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
    
$
-
  
                                 
Exercisable at December 31, 201
7
  
 
826,582
    
$
5.35
    
 
2.8
    
$
-
  
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, 20
15
    
534,933
     $
3.53
  
Vested
    
(221,745
 )    
4.01
  
Granted
    
230,836
      
2.52
  
                 
Outstanding at December 31, 201
6
    
544,024
     $
2.89
  
Vested
  
 
(569,263
)
  
 
2.20
  
Granted
  
 
458,081
    
 
1.26
  
Cancelled/Forfeited
  
 
(105,559
)
  
 
2.83
  
                 
Outstanding at December 31, 201
7
  
 
327,283
    
$
1.82