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Note 11 - Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
1
st
    
2
nd
    
3
rd
    
4
th
  
   
Quarter
    
Quarter
    
Quarter
    
Quarter
  
   
(In thousands, except per share data)
  
Year Ended December 31, 2017
                                
Net revenue
   $
18,802
     $
13,152
     $
24,722
     $
29,588
  
Operating income
   $
4,953
     $
1,260
     $
5,654
     $
9,470
  
Net income (loss)
   $
13,690
     $
7,195
     $
(770
 )   $
(4,109
 )
                                 
Net income (loss) per common share - basic
   $
0.09
     $
0.04
     $
-
     $
(0.02
 )
Net income (loss) per common share - diluted
   $
0.09
     $
0.04
     $
-
     $
(0.02
 )
                                 
Year Ended December 31, 2018
                                
Net revenue
   $
40,630
     $
30,916
     $
41,625
     $
35,996
  
Operating income
   $
20,090
     $
10,931
     $
17,735
     $
8,722
  
Net income (loss)
   $
10,779
     $
(10,554
 )   $
1,777
     $
55,819
  
                                 
Net income (loss) per common share - basic
   $
0.07
     $
(0.06
 )   $
0.01
     $
0.34
  
Net income (loss) per common share - diluted
   $
0.06
     $
(0.06
 )   $
0.01
     $
0.33