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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
(dollars in thousands, except per share amounts)
  
2018
    
2017
    
2016
  
                         
Net income - basic and diluted
   $
8,627
     $
8,905
     $
4,945
  
                         
Weighted average shares outstanding
    
58,358
      
56,933
      
39,281
  
                         
Net income per share – basic
   $
0.15
     $
0.16
     $
0.13
  
                         
Weighted average shares outstanding (including dilutive CSEs)
    
59,407
      
58,250
      
39,865
  
                         
Net income per share – diluted
   $
0.15
     $
0.15
     $
0.12
  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
(in thousands)
  
 
2018
    
 
2017
    
 
2016
  
                         
Anti-dilutive securities
                        
                         
Share based compensation awards
    
2,813
      
1,689
      
1,747
  
                         
Convertible securities
    
-
      
1,625
      
1,662
  
                         
Total anti-dilutive securities
    
2,813
      
3,314
      
3,409