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Note 2 - Common Stock Outstanding and Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the Three Months Ended
    
For the Six Months Ended
  
(Amounts in thousands, except per share information)
  
June 30,
    
June 30,
  
Earnings Per Share
  
2018
    
2017
    
2018
    
2017
  
Numerators:
                                
Net income
   $
3,618
     $
2,209
     $
6,859
     $
4,461
  
Denominators:
                                
Weighted average number of common shares outstanding - basic
(1)
    
16,245
      
15,014
      
16,237
      
14,220
  
Effect of potentially dilutive common shares
(2)
    
80
      
99
      
82
      
101
  
Weighted average number of common shares outstanding - diluted
    
16,325
      
15,113
      
16,319
      
14,321
  
Earnings per common share:
                                
Basic
   $
0.22
     $
0.15
     $
0.42
     $
0.31
  
Diluted
   $
0.22
     $
0.15
     $
0.42
     $
0.31
  
Anti-dilutive options not included in diluted earnings per share calculation
    
—
      
—
      
—
      
—
  
Anti-dilutive restricted shares not included in diluted earnings per share calculation
    
—
      
—
      
—
      
—