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Note 15 - Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
15.
Selected Quarterly Financial Data (unaudited and in thousands, except per share amounts)
 
   
First
Quarter
    
Second
Quarter
    
Third
Quarter
    
Fourth
Quarter
  
Fiscal 2017:
                                
Revenue
   $
17,380
     $
17,406
     $
16,946
     $
16,794
  
Operating income
   $
5,021
     $
5,053
     $
4,989
     $
4,544
  
Net income
   $
1,608
     $
1,536
     $
1,589
     $
7,382
  
Net income per common share - basic
   $
0.48
     $
0.46
     $
0.67
     $
2.21
  
Net income per common share - diluted
   $
0.47
     $
0.45
     $
0.65
     $
2.14
  
                                 
Fiscal 2018:
                                
Revenue
   $
16,726
     $
16,890
     $
16,252
     $
16,200
  
Operating income
   $
4,061
     $
5,172
     $
4,536
     $
4,024
  
Net income
   $
1,996
     $
2,908
     $
2,326
     $
2,237
  
Net income per common share - basic
   $
0.59
     $
0.86
     $
0.69
     $
0.66
  
Net income per common share - diluted
   $
0.58
     $
0.85
     $
0.67
     $
0.65