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Note 9 - Earnings (Loss) Per Share ("EPS") (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Three Months Ended
 
 
Six
Months Ended
 
 
 
June 30, 2017
 
 
July 1, 2016
 
 
June 30, 2017
 
 
July 1, 2016
 
Basic net loss per share:
                                
Net loss
   $
(11,238
 )   $
(8,761
 )   $
(24,360
 )   $
(15,903
 )
Weighted average common shares outstanding
    
10,458
      
10,266
      
10,396
      
10,262
  
Basic net loss per share
   $
(1.07
 )   $
(0.85
 )   $
(2.34
 )   $
(1.55
 )
Diluted net loss per share:
                                
Net loss
   $
(11,238
 )   $
(8,761
 )   $
(24,360
 )   $
(15,903
 )
Weighted average common shares outstanding
    
10,458
      
10,266
      
10,396
      
10,262
  
Dilutive stock options, restricted stock and restricted stock units
    
—
      
—
      
—
      
—
  
Weighted average common shares outstanding – assuming dilution
    
10,458
      
10,266
      
10,396
      
10,262
  
Diluted net loss per share
   $
(1.07
 )   $
(0.85
 )   $
(2.34
 )   $
(1.55
 )
Outstanding securities and warrants that were not included in the diluted calculation because their effect would be anti-dilutive
    
1,812
      
1,652
      
1,812
      
1,652