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Note 18 - Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2020
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
18.
Quarterly Financial Information (Unaudited)
 
 
   
Condensed Consolidated Statements of Operations
  
   
2020
  
   
Q1
    
Q2
    
Q3
    
Q4
  
   
(in thousands, except per share data)
  
Revenue
   $
16,729
     $
8,924
     $
10,420
     $
11,071
  
Gross profit
    
2,585
      
1,046
      
1,890
      
2,205
  
Loss from operations
    
(439
 )    
(1,075
 )    
(138
 )    
(202
 )
Net loss
    
(474
 )    
(1,073
 )    
(136
 )    
(206
 )
Basic loss per share
    
(0.04
 )    
(0.08
 )    
(0.01
 )    
(0.02
 )
Diluted loss per share
   $
(0.04
 )   $
(0.08
 )   $
(0.01
 )   $
(0.02
 )
Shares used in per share calculations:
                                
Basic
    
13,055
      
13,110
      
13,165
      
13,225
  
Diluted
    
13,055
      
13,110
      
13,165
      
13,225
  
 
   
2019
  
   
Q1
    
Q2
    
Q3
    
Q4
  
   
(in thousands, except per share data)
  
Revenue
   $
15,096
     $
14,180
     $
14,641
     $
15,366
  
Gross profit
    
2,391
      
2,423
      
2,632
      
2,650
  
Loss from operations
    
(2,879
 )    
(3,929
 )    
(1,129
 )    
(1,377
 )
Net loss
    
(2,846
 )    
(3,868
 )    
(1,107
 )    
(1,360
 )
Basic loss per share
    
(0.22
 )    
(0.30
 )    
(0.09
 )    
(0.10
 )
Diluted loss per share
   $
(0.22
 )   $
(0.30
 )   $
(0.09
 )   $
(0.10
 )
Shares used in per share calculations:
                                
Basic
    
12,795
      
12,855
      
12,934
      
12,997
  
Diluted
    
12,795
      
12,855
      
12,934
      
12,997
  
 
   
Condensed Consolidated Balance Sheets
  
   
2020
  
   
March 31
    
June 30
    
September 30
    
December 31
  
   
(in thousands)
  
Cash, cash equivalents, restricted cash and short-term investments
   $
10,644
     $
12,582
     $
12,572
     $
12,960
  
Total current assets
    
22,002
      
20,245
      
19,062
      
20,002
  
Total assets
    
23,973
      
22,075
      
21,063
      
22,282
  
Total current liabilities
    
12,856
      
11,422
      
10,544
      
11,339
  
Total shareholders' equity
   $
9,401
     $
8,432
     $
8,622
     $
8,651
  
 
   
2019
  
   
March 31
    
June 30
    
September 30
    
December 31
  
   
(in thousands)
  
Cash, cash equivalents, restricted cash and short-term investments
   $
15,000
     $
12,560
     $
11,610
     $
10,561
  
Total current assets
    
26,428
      
22,897
      
21,442
      
20,515
  
Total assets
    
29,673
      
24,967
      
23,056
      
23,055
  
Total current liabilities
    
12,464
      
11,882
      
11,226
      
11,200
  
Total shareholders' equity
   $
15,673
     $
11,835
     $
10,888
     $
9,696