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Note 12 - Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Quarterly Financial Information [Table Text Block]
    Quarter Ended - 2020  
    MAR 31     JUN 30     SEP 30     DEC 31  
Revenues   $
7,537
     $
3,314
     $
5,174
     $
5,335
  
Gross profit    
2,728
      
(252
 )    
1,133
      
1,277
  
Loss from operations    
(242
 )    
(3,306
 )    
(1,409
 )    
(1,109
 )
Net loss    
(159
 )    
(2,050
 )    
(1,107
 )    
(543
 )
Basic net loss per share   $
(0.03
 )   $
(0.37
 )   $
(0.20
 )   $
(0.10
 )
Diluted net loss per share   $
(0.03
 )   $
(0.37
 )   $
(0.20
 )   $
(0.10
 )
    Quarter Ended - 2019  
    MAR 31     JUN 30     SEP 30     DEC 31  
Revenues   $
9,822
     $
9,289
     $
9,852
     $
8,715
  
Gross profit    
4,408
      
4,169
      
4,382
      
3,485
  
Income (loss) from operations    
944
      
1,326
      
1,334
      
(606
 )
Net income (loss)    
627
      
768
      
677
      
(530
 )
Basic net income (loss) per share   $
0.11
     $
0.14
     $
0.12
     $
(0.09
 )
Diluted net income (loss) per share   $
0.11
     $
0.14
     $
0.12
     $
(0.09
 )