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Note 13 - Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2019
    
2018
    
2019
    
2018
  
                                 
Net income (loss)
   $
2,974
     $
(5,686
 )   $
5,139
     $
(7,637
 )
                                 
Basic weighted-average common shares outstanding
    
9,736
      
9,727
      
9,736
      
9,717
  
Effect of potentially dilutive common shares
(1)
    
17
      
-
      
9
      
-
  
Diluted weighted-average common shares outstanding
    
9,753
      
9,727
      
9,745
      
9,717
  
                                 
Net income (loss) per common share:
                                
Basic
   $
0.31
     $
(0.59
 )   $
0.53
     $
(0.79
 )
Diluted
   $
0.31
     $
(0.59
 )   $
0.53
     $
(0.79
 )