Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies (Tables)

3 Months Ended

Aug. 26, 2018

Notes Tables

Schedule of Cash and Cash Equivalents [Table Text Block]

	August 26, 2018		May 27, 2018			August 27, 2017			May 28, 2017
Cash and cash equivalents	$	1,359	$	2,899		$	8,264		$	5,998
Restricted cash		325		325			325			325
Cash, discontinued operations		—		(8	)		(73	)		(589	)
Cash, cash equivalents and restricted cash	$	1,684	$	3,216		$	8,516		$	5,734

Schedule of Inventory, Current [Table Text Block]

	August 26, 2018		May 27, 2018
Raw materials	$	13,891	$	15,286
Work in progress		3,146		3,672
Finished goods		12,949		12,861
Total	$	29,986	$	31,819

Comprehensive Income (Loss) [Table Text Block]

	AOCI
Accumulated OCI, net, as of May 27, 2018	$	1,148
Unrealized losses on interest rate swap contracts, net of tax effect		(89	)
Amounts reclassified from OCI		—
Accumulated OCI, net, as of August 26, 2018	$	1,059

Schedule of Effect of Significant Unobservable Inputs for Investment [Table Text Block]

	At August 26, 2018			At May 27, 2018
Revenue growth rates		6	%		6	%
Expense growth rates		6	%		6	%
Income tax rates		15	%		15	%
Discount rates		12	%		12	%

Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block]

	Impact on value of investment in Windset as of August 26, 2018
10% increase in revenue growth rates	$	10,100
10% increase in expense growth rates	$	(9,400	)
10% increase in income tax rates	$	(500	)
10% increase in discount rates	$	(4,300	)

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value at August 26, 2018						Fair Value at May 27, 2018
Assets:	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Interest rate swap contract	$	—	$	1,466	$	—	$	—	$	1,529	$	—
Investment in non-public company		—		—		67,500		—		—		66,500
Total assets	$	—	$	1,466	$	67,500	$	—	$	1,529	$	66,500
Liabilities:
Interest rate swap contract	$	—	$	54	$	—	$	—	$	—	$	—
Contingent consideration liability		—		—		4,000		—		—		4,000
Total liabilities	$	—	$	54	$	4,000	$	—	$	—	$	4,000

Disaggregation of Revenue [Table Text Block]

	Three Months Ended
Natural Foods :	August 26, 2018		August 27, 2017
Salads	$	49,080	$	42,048
Core vegetables		61,750		58,075
Other		1,221		3,494
Total	$	112,051	$	103,617

	Three Months Ended
Biomaterials :	August 26, 2018		August 27, 2017
Aseptic	$	5,766	$	7,026
Fermentation		3,070		2,791
Development services		3,781		2,347
Total	$	12,617	$	12,164