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Note 18 - Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
18.
Selected Quarterly Financial Data (Unaudited):
 
 
   
December 31
    
September 30
    
June 30
    
March 31
  
   
(in thousands, except for per share data)
  
                                 
2017
                                
Total revenues
   $
90,621
     $
85,008
     $
84,223
     $
69,568
  
Gross profit
    
25,736
      
20,494
      
21,347
      
16,944
  
Net income
    
11,199
      
3,439
      
5,241
      
2,446
  
Earnings per share:
                                
Basic
  $
1.06
     $
0.33
     $
0.50
     $
0.23
  
Diluted
   
1.04
      
0.32
      
0.49
      
0.23
  
                                 
2016
                                
Total revenues
   $
48,805
     $
49,064
     $
47,204
     $
44,746
  
Gross profit
    
16,423
      
16,638
      
15,645
      
14,348
  
Net income
    
2,817
      
4,741
      
4,071
      
4,438
  
Earnings per share:
                                
Basic
  $
0.27
     $
0.45
     $
0.39
     $
0.42
  
Diluted
   
0.26
      
0.45
      
0.38
      
0.41