Receivables: (Tables)

12 Months Ended

Dec. 30, 2017

Receivables:

Schedule of the Company's current receivables

	December 30, 2017		December 31, 2016
Trade	$	9,800	$	12,200
Royalty		1,574,500		1,302,700
Other		211,700		164,300
	$	1,796,000	$	1,479,200

Schedule of activity in the allowance for doubtful accounts for trade receivables

	December 30, 2017		December 31, 2016		December 26, 2015
Balance at beginning of year	$	2,100	$	200	$	1,600
Provisions charged to expense		(1,600)		2,800		1,500
Deductions for amounts written-off		(100)		(900)		(2,900)
Balance at end of year	$	400	$	2,100	$	200