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Note 3 - Earnings (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended June 30,
    
Six months ended June 30,
  
   
2018
    
2017
    
2018
    
2017
  
Numerator:
                                
Net loss
   $
(2,163
)
   $
(820
)
   $
(4,009
)
   $
(1,288
)
Denominator:
                                
Basic weighted average shares outstanding
    
8,301,094
      
8,638,091
      
8,304,093
      
8,702,743
  
Dilutive common stock equivalents using treasury stock method
    
—
      
—
      
—
      
—
  
Diluted weighted average shares outstanding
    
8,301,094
      
8,638,091
      
8,304,093
      
8,702,743
  
                                 
Basic loss per common share
   $
(0.26
)
   $
(0.09
)
   $
(0.48
)
   $
(0.15
)
Diluted loss per common share
   $
(0.26
)
   $
(0.09
)
   $
(0.48
)
   $
(0.15
)
                                 
Weighted average options outstanding
    
724,373
      
869,838
      
736,160
      
858,845
  
Anti-dilutive options not included in the computations
    
724,373
      
869,838
      
736,160
      
858,845