Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents (Details) - USD ($)		Aug. 26, 2018	May 27, 2018	Aug. 27, 2017	May 28, 2017
Cash and cash equivalents		$ 1,359,000	$ 2,899,000	$ 8,264,000	$ 5,998,000
Restricted cash		325,000	325,000	325,000	325,000
Cash, discontinued operations			(8,000)	(73,000)	(589,000)
Cash, cash equivalents and restricted cash	[1]	$ 1,684,000	$ 3,216,000	$ 8,516,000	$ 5,734,000

[1] As a result of adopting ASU 2016-18, the Company now is required to include restricted cash as part of the change in the total cash balance. Accordingly, cash and cash equivalents at the beginning-of-period and end-of-period total amounts have been adjusted to include $325,000 of restricted cash for each of the periods presented. Refer to Note 1, "Recently Adopted Accounting Pronouncements," in the Notes to Condensed Consolidated Financial Statements for more information.