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Note 13 - Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Quarterly Financial Information [Table Text Block]
(In thousands, except per share amounts)
  
First Quarter
    
Second Quarter
    
Third Quarter
    
Fourth Quarter
  
2018
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Total revenues
   $
55,943
     $
65,278
     $
62,166
     $
44,187
  
Gross profit
(a)
    
11,612
      
17,418
      
12,760
      
9,229
  
Operating income
    
5,620
      
10,647
      
5,804
      
2,025
  
Net income
    
5,266
      
10,203
      
6,211
      
3,394
  
Net earnings per share:
(b)
                                
Basic
   $
0.13
     $
0.25
     $
0.15
     $
0.08
  
Diluted
   $
0.13
     $
0.25
     $
0.15
     $
0.08
  
                                 
2017
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Total revenues
   $
11,538
     $
11,074
     $
14,405
     $
24,019
  
Gross profit (loss)
(a)
   $
692
     $
(701
 )   $
(2,120
 )   $
2,644
  
Operating loss
    
(3,184
 )    
(3,710
 )    
(6,342
 )    
(2,657
 )
Net loss
    
(3,093
 )    
(3,488
 )    
(6,236
 )    
(2,600
 )
Net loss per share:
(b)
                                
Basic
   $
(0.10
 )   $
(0.09
 )   $
(0.16
 )   $
(0.07
 )
Diluted
   $
(0.10
 )   $
(0.09
 )   $
(0.16
 )   $
(0.07
 )