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Note 9 - Earnings (Loss) Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
Ju
ne 30
,
    
Ju
ly
1
,
    
J
une 30
,
    
Ju
ly 1
,
  
   
201
9
    
201
8
    
2
019
    
201
8
  
   
(Unaudited)
    
(Unaudited)
  
Income (loss) attributable to stockholders:
                                
Net income (loss) as reported
   $
1,503
     $
814
     $
(1,533
)
   $
(981
)
Less distributed and undistributed earnings allocable to restricted award holders
    
(28
)
    
(32
)
    
0
      
0
  
Less dividends declared attributable to restricted award holders
    
0
      
0
      
0
      
0
  
Net income (loss) allocable to common stockholders
   $
1,475
     $
782
     $
(1,533
)
   $
(981
)
                                 
Income (loss) per common share attributable to stockholders:
                                
Basic
   $
0.07
     $
0.04
     $
(0.07
)
   $
(0.05
)
Diluted
   $
0.07
     $
0.04
     $
(0.07
)
   $
(0.05
)
                                 
Weighted average shares outstanding – basic
    
20,875
      
20,541
      
20,772
      
20,468
  
Weighted average additional shares assuming conversion of potential common shares
    
0
      
314
      
0
      
0
  
Weighted average shares outstanding – diluted
    
20,875
      
20,855
      
20,772
      
20,468