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Note 11 - Share-based Compensation (Tables)
9 Months Ended
Sep. 26, 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
   
362,661
    $
2.07
 
Vested
   
(60,000
)
  $
4.62
 
Forfeited or expired
   
-
     
-
 
Outstanding non-vested at September 26, 2020
   
454,386
    $
2.26
 
   
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
   
(200,000
)
  $
4.89
 
Outstanding non-vested at September 26, 2020
   
-
     
-