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Note 11 - Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2017
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, 2017
and
2016:
 
    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
  
 
    Quarter Ended - 2016
    MAR 31   JUN 30   SEP 30   DEC 31
Revenues   $
6,667
     $
9,700
     $
11,849
     $
10,764
  
Gross profit    
2,738
      
5,209
      
7,105
      
6,398
  
Income (loss) from operations    
(2
 )    
2,371
      
4,104
      
3,637
  
Net income (loss)    
(23
 )    
1,633
      
2,708
      
2,360
  
Basic net income per share   $
0.00
     $
0.30
     $
0.49
     $
0.44
  
Diluted net income per share   $
0.00
     $
0.30
     $
0.49
     $
0.43