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Receivables: (Details) - USD ($)
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Current receivables      
Trade $ 19,700 $ 9,800  
Royalty 1,396,000 1,574,500  
Other 137,400 211,700  
Total current receivables 1,553,100 1,796,000  
Activity in the allowance for doubtful accounts for trade receivables      
Balance at beginning of year 400 2,100 $ 200
Provisions charged to expense (300) (1,600) 2,800
Deductions for amounts written-off 300 (100) (900)
Balance at end of year $ 400 $ 400 $ 2,100