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Note 15 - Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
15. QUARTERLY FINANCIAL DATA (UNAUDITED)
 
2015 and 2014 Quarterly Financial Data
 
The following table sets forth certain unaudited results of operations for each quarter during 2015 and 2014. The unaudited information has been prepared on the same basis as the audited consolidated financial statements and includes all adjustments which management considers necessary for a fair presentation of the financial data shown. The operating results for any quarter are not necessarily indicative of the results to be attained for any future period. Basic and diluted loss per share are computed independently for each of the periods presented. Accordingly, the sum of the quarterly loss per share may not agree to the total for the year (in thousands, except for per share data).
 
   
Quarter Ended
 
   
2015
      
2014
  
   
Dec. 31
    
Oct. 3
    
July 4
    
Apr. 4
    
Dec. 31
    
Sep. 27
    
June 28
    
Mar. 29
  
                                                                 
Net sales
   $ 12,287     $ 12,123     $ 15,796     $ 18,446     $ 20,879     $ 18,871     $ 23,261     $ 23,271  
Cost of sales
     10,223       10,495       12,823       14,438       17,139       16,038       22,616       21,000  
Gross profit
     2,064       1,628       2,973       4,008       3,740       2,833       645       2,271  
Research and development expenses
     4,689       4,695       5,063       5,211       5,270       5,600       7,262       8,576  
Selling and administrative expense
     3,078       3,080       3,520       3,803       3,640       3,792       4,536       5,126  
Restructuring charges
     -       -       561       -       133       105       4,409       1,451  
Operating loss
     (5,703
)
     (6,147
)
     (6,171
)
     (5,006
)
     (5,303
)
     (6,664
)
     (15,562
)
     (12,882
)
Interest income
     -       -       -       -       -       1       1       5  
Interest expense
     (28
)
     (20
)
     (19
)
     (16
)
     (134
)
     (76
)
     (60
)
     (33
)
Other income, net
     (399
)
     12       10       (3
)
     -       70       587       1,160  
Net loss
   $ (6,130
)
   $ (6,155
)
   $ (6,180
)
   $ (5,025
)
   $ (5,437
)
   $ (6,669
)
   $ (15,034
)
   $ (11,750
)
                                                                 
Net loss per share:
                                                                
Basic
   $ (0.07
)
   $ (0.07
)
   $ (0.07
)
   $ (0.06
)
   $ (0.06
)
   $ (0.08
)
   $ (0.18
)
   $ (0.14
)
Diluted
   $ (0.07
)
   $ (0.07
)
   $ (0.07
)
   $ (0.06
)
   $ (0.06
)
   $ (0.08
)
   $ (0.18
)
   $ (0.14
)