6. Investment in National Beef Packing Company (Details - Summary of operations) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Investment in National Beef Packing
Net sales	$ 0	$ 0	$ 0	$ 0
Costs and expenses:
Cost of sales	0	0	0	0
Selling, general, and administrative expenses	1,221	887	2,347	2,691
Depreciation and amortization	4	4	9	9
Total costs and expenses	1,225	891	2,356	2,700
Other income (expense):
Interest income	7	263	158	647
Interest expense	0	(3)	(2)	(15)
National Beef Packing Company, LLC [Member]
Investment in National Beef Packing
Net sales	2,677,697	2,113,648	4,863,046	3,940,720
Costs and expenses:
Cost of sales	1,947,262	1,890,238	3,995,881	3,591,638
Selling, general, and administrative expenses	20,859	22,425	39,233	39,395
Depreciation and amortization	26,795	29,722	53,323	57,617
Total costs and expenses	1,994,916	1,942,385	4,088,437	3,688,650
Operating income	682,781	171,263	774,609	252,070
Other income (expense):
Interest income	56	120	137	238
Interest expense	(2,323)	(3,587)	(6,571)	(6,142)
Income before taxes	680,514	167,796	768,175	246,166
Income tax expense	(1,250)	(646)	(2,004)	(980)
Net income	679,264	167,150	766,171	245,186
NBP's net income attributable to USPB	$ 102,385	$ 25,194	$ 115,484	$ 36,957