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Receivables: (Details) (USD $)
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Current receivables      
Trade $ 17,700 $ 20,800  
Royalty 1,150,200 1,074,600  
Other 37,600 141,700  
Total current receivables 1,205,500 1,237,100  
Activity in the allowance for doubtful accounts for trade receivables      
Balance at beginning of year 17,300 15,100 17,400
Provisions charged to expense (3,800) 2,900 (2,200)
Deductions for amounts written-off (9,200) (700) (100)
Balance at end of year $ 4,300 $ 17,300 $ 15,100