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Note 11 - Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
11.
Selected Quarterly Financial Data (Unaudited)
 
The following are selected quarterly financial data for the years ended
December 31, 2018
and
2017
(in thousands):
 
    Quarter Ended - 2018  
    MAR 31     JUN 30     SEP 30     DEC 31  
Revenues   $
10,935
     $
10,787
     $
11,016
     $
9,936
  
Gross profit    
5,355
      
5,172
      
5,358
      
4,733
  
Income from operations    
1,906
      
2,056
      
2,120
      
1,528
  
Net income    
1,251
      
1,177
      
1,275
      
881
  
Basic net income per share   $
0.23
     $
0.21
     $
0.23
     $
0.16
  
Diluted net income per share   $
0.23
     $
0.21
     $
0.23
     $
0.16
  
 
    Quarter Ended - 2017  
  MAR 31     JUN 30     SEP 30     DEC 31  
Revenues   $
10,209
     $
9,684
     $
10,049
     $
9,760
  
Gross profit    
5,316
      
4,609
      
5,121
      
4,777
  
Income from operations    
2,268
      
1,710
      
2,232
      
1,947
  
Net income    
1,500
      
907
      
1,364
      
2,350
  
Basic net income per share   $
0.27
     $
0.17
     $
0.25
     $
0.43
  
Diluted net income per share   $
0.27
     $
0.16
     $
0.25
     $
0.42