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Note 11 - Share-based Compensation (Tables)
 6 Months Ended
Jun. 27, 2020
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
   
Number of
Time-Based
Restricted
Stock Units
    
Weighted
Average
Grant Date Fair
Value per Share
  
Outstanding non-vested at December 28, 2019
    
151,725
     $
3.64
  
Granted
    
165,000
     $
2.69
  
Vested
    
(35,000
)
   $
4.28
  
Forfeited or expired
    
-
      
-
  
Outstanding non-vested at June 27, 2020
    
281,725
     $
3.00
  
   
Number of
Performance-
Based
Restricted
Stock Units
    
 
Weighted
Average
Grant Date Fair
Value per Share
  
Outstanding non-vested at December 28, 2019
    
240,000
     $
4.81
  
Granted
    
-
      
-
  
Vested
    
(40,000
)
   $
4.38
  
Forfeited or expired
    
(40,000
)
   $
4.38
  
Outstanding non-vested at June 27, 2020
    
160,000
     $
5.02