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(5) Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 30, 2017
Retirement Benefits [Abstract]  
Stock Option Activity
            Weighted      Weighted         
            Average      Remaining      Aggregate  
            Exercise      Contractual      Intrinsic  
     Shares      Price      Life (years)      Value  
Outstanding at                    
beginning of year   1,557,905   $1.79           
Granted   167,500   $1.58           
Exercised   —      —             
Forfeited   (50,500)  $1.78           
Expired   (8,000)  $2.17           
Outstanding at                    
end of year   1,666,905   $1.77    5.2   $266,667 
    ========    =====    ===   ======== 
Options exercisable                    
at year-end   1,230,905   $1.73    4.3   $207,455 
    ========    =====    ===   ======== 
Annualized weighted average values of the significant assumptions used to estimate the fair values of options granted during 2017 and 2016
     2017      2016  
Risk-free interest rate   2.08-2.23%    1.39-1.53% 
Expected life in years   6.1    6.3 
Expected volatility   54%   53%
Expected dividend yield   0    0 
Weighted average fair value of grants  $.84   $.85