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Note 2 - Common Stock Outstanding and Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the Three Months Ended
    
For the Nine Months Ended
  
(Amounts in thousands, except per share information)
  
September 30,
    
September 30,
  
Earnings Per Share
  
2018
    
2017
    
2018
    
2017
  
Numerators:
                                
Net income
   $
4,032
     $
2,876
     $
10,891
     $
7,337
  
Denominators:
                                
Weighted average number of common shares outstanding - basic
(1)
    
16,252
      
16,191
      
16,242
      
14,884
  
Effect of potentially dilutive common shares
(2)
    
90
      
97
      
85
      
100
  
Weighted average number of common shares outstanding - diluted
    
16,342
      
16,288
      
16,327
      
14,984
  
Earnings per common share:
                                
Basic
   $
0.25
     $
0.18
     $
0.67
     $
0.49
  
Diluted
   $
0.25
     $
0.18
     $
0.67
     $
0.49
  
Anti-dilutive options not included in diluted earnings per share calculation
    
—
      
70
      
—
      
74
  
Anti-dilutive restricted shares not included in diluted earnings per share calculation
    
—
      
42
      
—
      
43