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Note 3 - Earnings (Loss) Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended March 31,
  
   
2018
    
2017
  
Numerator:
                
Net loss
   $
(1,846
)
   $
(468
 )
Denominator:
                
Basic weighted average shares outstanding
    
8,307,125
      
8,768,112
  
Dilutive common stock equivalents using treasury stock method
    
—
      
—
  
Diluted weighted average shares outstanding
    
8,307,125
      
8,768,112
  
                 
Basic loss per common share
   $
(0.22
)
   $
(0.05
 )
Diluted loss per common share
   $
(0.22
)
   $
(0.05
 )
                 
Weighted average options outstanding
    
748,078
      
847,731
  
Anti-dilutive options not included in the computations
    
748,078
      
847,731