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Note 10 - Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
Numerator:
  
2020
    
2019
    
2020
    
2019
  
Net income
(in thousands)
   $
2,940
     $
1,135
     $
6,662
     $
556
  
Denominator:
                                
Weighted average common shares outstanding:
                                
Basic
    
20,179,056
      
19,781,527
      
20,060,416
      
19,690,737
  
Dilutive effect of common stock equivalents
    
1,484,358
      
897,904
      
1,577,065
      
813,196
  
Diluted
    
21,663,414
      
20,679,431
      
21,637,481
      
20,503,933
  
Net income per share:
                                
Basic
   $
0.15
     $
0.06
     $
0.33
     $
0.03
  
Diluted
   $
0.14
     $
0.05
     $
0.31
     $
0.03