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Note 16 - Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
16.
Selected Quarterly Financial Data (unaudited and in thousands, except per share amounts)
 
   
First
Quarter
    
Second
Quarter
    
Third
Quarter
    
Fourth
Quarter
  
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
  
                                 
Fiscal 2019:
                                
Revenue
   $
15,755
     $
15,658
     $
15,762
     $
15,591
  
Operating income
   $
3,763
     $
3,708
     $
3,841
     $
3,532
  
Net income
   $
2,281
     $
1,717
     $
1,819
     $
1,979
  
Net income per common share-basic
   $
0.67
     $
0.50
     $
0.53
     $
0.58
  
Net income per common share-diluted
   $
0.66
     $
0.50
     $
0.53
     $
0.58