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Note 17 - Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Quarterly Financial Information [Table Text Block]
For the quarters ended
  
March 31,
    
June 30,
    
September 30,
    
December 31,
  
2020
      
 
      
 
      
 
      
 
Revenues
   $
3,778
     $
4,401
     $
8,155
     $
6,216
  
Cost of sales
    
2,251
      
3,799
      
2,249
      
3,613
  
Net (loss) income from continuing operations
    
(2,567
 )    
(2,544
 )    
2,376
      
(1,543
 )
Income (loss) from discontinued operations
    
—
      
—
      
—
      
—
  
Net (loss) income
    
(2,567
 )    
(2,544
 )    
2,376
      
(1,543
 )
Basic net (loss) income per common share:
                                
Continuing operations
    
(0.10
 )    
(0.10
 )    
0.10
      
(0.07
 )
Discontinued operations
    
—
      
—
      
—
      
—
  
Basic net (loss) income per common share:
   $
(0.10
 )   $
(0.10
 )   $
0.10
     $
(0.07
 )
Diluted net (loss) income per common share:
                                
Continuing operations
    
(0.10
 )    
(0.10
 )    
0.09
      
(0.07
 )
Discontinued operations
    
—
      
—
      
—
      
—
  
Diluted net (loss) income per common share:
   $
(0.10
 )   $
(0.10
 )   $
0.09
     $
(0.07
 )
                                 
2019
      
 
      
 
      
 
      
 
Revenues
   $
10,155
     $
8,948
     $
6,452
     $
4,912
  
Cost of sales
    
6,141
      
5,050
      
3,563
      
4,883
  
Net loss from continuing operations
    
(1,279
 )    
(936
 )    
(1,296
 )    
(4,340
 )
Loss from discontinued operations
    
(10
 )    
(9
 )    
18
      
—
  
Net loss
    
(1,289
 )    
(945
 )    
(1,278
 )    
(4,340
 )
Basic net loss per common share:                                
Continuing operations
    
(0.05
 )    
(0.04
 )    
(0.05
 )    
(0.18
 )
Discontinued operations
    
—
      
—
      
—
      
—
  
Basic net loss per common share:
   $
(0.05
 )   $
(0.04
 )   $
(0.05
 )   $
(0.18
 )
Diluted net loss per common share:                                
Continuing operations
    
(0.05
 )    
(0.04
 )    
(0.05
 )    
(0.18
 )
Discontinued operations
    
—
      
—
      
—
      
—
  
Diluted net loss per common share:
   $
(0.05
 )   $
(0.04
 )   $
(0.05
 )   $
(0.18
 )