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Note 10 - Net Income Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Month Period Ended
    
Nine Month Period Ended
  
   
September 30,
    
September 30,
  
(In thousands, except per share and share data)
  
2019
    
2018
    
2019
    
2018
  
Numerator:
                                
Net income attributable to common stockholders
   $
9,316
     $
1,151
     $
10,581
     $
2,094
  
                                 
Denominator:
                                
Weighted average basic shares outstanding
    
19,735,364
      
17,273,412
      
19,071,722
      
15,529,026
  
Effect of dilutive securities
    
5,607,748
      
6,383,221
      
5,633,702
      
5,522,193
  
Weighted average diluted shares
    
25,343,112
      
23,656,633
      
24,705,424
      
21,051,219
  
                                 
Basic earnings per share
   $
0.47
     $
0.07
     $
0.55
     $
0.13
  
Diluted earnings per share
   $
0.37
     $
0.05
     $
0.43
     $
0.10