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Note 2 - Income Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
(in thousands except per share data)
  
Three Months ended
September 30
,
    
Nine Month
s ended
September 30
,
  
   
2017
    
2016
    
2017
    
2016
  
Numerator:
                                
Net income
   $
4,632
     $
2,869
     $
6,141
     $
10,853
  
Denominator:
                                
Denominator for basic earnings per share
– weighted-average shares
    
18,288
      
18,194
      
18,275
      
18,177
  
Effect of dilutive securities:
                                
Equivalent shares issuable upon conversion of unvested restricted stock
    
116
      
93
      
91
      
81
  
Denominator for diluted earnings per share
– adjusted weighted-average shares and assumed conversions
    
18,404
      
18,287
      
18,366
      
18,258
  
                                 
Basic
income per share:
   $
0.25
     $
0.16
     $
0.34
     $
0.60
  
Diluted income per share:
   $
0.25
     $
0.16
     $
0.33
     $
0.59