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Note 3 - Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Year Ended
December 31,
2018		   Year Ended
December 31,
2017
Basic and diluted net loss per share                
Numerator:                
Net loss   $
(5,760
 )   $
(5,101
 )
Denominator:                
Weighted-average shares outstanding    
19,752,248
      
18,914,059
  
Add:                
Dilutive effect of stock options    
—
      
—
  
Dilutive effect of restricted common stock    
—
      
—
  
Weighted-average shares outstanding with dilution    
19,752,248
      
18,914,059
  
Net loss per share:                
Basic   $
(0.29
 )   $
(0.27
 )
Diluted   $
(0.29
 )   $
(0.27
 )