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Note 10 - Per Share Data (Tables)
 9 Months Ended
Sep. 26, 2020
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
Thirteen Week Periods Ended
    
Thirty-Nine Week Periods Ended
  
   
September 26,
2020
    
September 28,
2019
    
September 26,
2020
    
September 28,
2019
  
Basic weighted average shares outstanding
    
11,444,697
      
12,955,198
      
12,393,058
      
12,897,303
  
Dilutive effect of outstanding restricted share units
    
45,411
      
63,416
      
34,181
      
53,628
  
Weighted average dilutive shares outstanding
    
11,490,108
      
13,018,614
      
12,427,739
      
12,950,931
  
Unissued Shares of Common Stock [Table Text Block]
   
September 26,
2020
    
December 28,
2019
  
Time-based restricted stock units outstanding
    
454,386
      
151,725
  
Performance-based restricted stock units outstanding
    
-
      
240,000
  
Future grants of options or shares
    
5,573
      
268,326
  
Shares reserved for employee stock purchase plan
    
149,894
      
267,877
  
                 
Total
    
609,853
      
927,928