Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents (Details) - USD ($)		Feb. 24, 2019	May 27, 2018	Feb. 25, 2018	May 28, 2017
Accounting Policies [Abstract]
Cash and cash equivalents		$ 1,722,000	$ 2,899,000	$ 7,660,000	$ 5,998,000
Restricted cash		385,000	325,000	325,000	325,000
Cash, discontinued operations		0	(8,000)	(10,000)	(589,000)
Cash, cash equivalents and restricted cash	[1]	$ 2,107,000	$ 3,216,000	$ 7,975,000	$ 5,734,000

[1] As a result of adopting ASU 2016-18, cash and cash equivalents at the beginning-of-period and end-of-period total amounts have been adjusted.