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Note I - Equity-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Share-based Compensation, Activity [Table Text Block]
   
Number of
Options/SARs/RSUs
    
Weighted
average
exercise price
    
Weighted average
remaining
contractual term
(years) (3)
    
Aggregate value
(*)
  
   
in thousands
    
 
 
 
  
 
 
 
  
in thousands
  
Outstanding at June 30, 2018
    
2,107
     $
4.55
      
 
      
 
  
RSUs granted
    
7
      
-
      
 
      
 
  
Options / SARs / RSUs cancelled/forfeited/expired
    
(20
 )    
5.33
      
 
      
 
  
Options / SARs exercised and RSUs vested
    
(79
 )   $
0.42
      
 
      
 
  
Outstanding at September 30, 2018 (1)
    
2,015
     $
4.68
      
4.08
     $
14,640
  
Exercisable at September 30, 2018 (2)
    
817
     $
8.83
      
3.55
     $
2,560
  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
   
Exercisable
    
Unexercisable
    
Total
  
Exercise prices
  
Number of
Options/
SARs / RSUs
(in thousands)
    
Weighted
average
exercise
price
    
Number of
Options/
SARs / RSUs
(in thousands)
    
Weighted
average
exercise
price
    
Number of
Options/
SARs / RSUs
(in thousands)
    
Weighted
average
exercise
price
  
                                                 
Less than $11.90
    
763
     $
8.54
      
1,133
     $
1.24
      
1,896
     $
4.18
  
Above $11.90
    
54
     $
12.97
      
65
     $
12.46
      
119
     $
12.69
  
Total
    
817
     $
8.83
      
1,198
     $
1.85
      
2,015
     $
4.68