Receivables: (Tables)

12 Months Ended

Dec. 29, 2018

Receivables:

Schedule of the Company's current receivables

	December 29, 2018		December 30, 2017
Trade	$	19,700	$	9,800
Royalty		1,396,000		1,574,500
Other		137,400		211,700
	$	1,553,100	$	1,796,000

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

	December 29, 2018		December 30, 2017		December 31, 2016
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