Note 2 - Acquisition of O Olive (Details Textual) - USD ($)		3 Months Ended	12 Months Ended				36 Months Ended
	Mar. 01, 2017	May 28, 2017	May 28, 2017	May 29, 2016		May 31, 2015	May 31, 2020
Payments to Acquire Businesses, Gross			$ 2,500,000
Finite-lived Intangible Assets Acquired			2,300,000
Goodwill		$ 54,779,000	54,779,000	$ 49,620,000	[1]
O Olive [Member]
Payments to Acquire Businesses, Gross	$ 2,500,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	7,500,000
Contingent Consideration Payment Period							3 years
Cumulative EBITDA Amount	$ 6,000,000
Business Combination, Contingent Consideration, Liability		5,900,000	5,900,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		773,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		231,000
Finite-Lived Intangible Asset, Useful Life	11 years
Goodwill	$ 5,200,000
Business Acquisition, Transaction Costs		159,000	159,000
O Olive [Member] | Customer Lists [Member]
Finite-lived Intangible Assets Acquired	700,000
O Olive [Member] | Trademarks and Trade Names [Member]
Indefinite-lived Intangible Assets Acquired	$ 1,600,000
O Olive [Member] | Initial Potential Payment Limit [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		4,600,000	4,600,000
O Olive [Member] | Additional Potential Payment Limit [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		$ 2,900,000	$ 2,900,000

[1] Derived from audited financial statements. See Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies for discussion of accounting guidance adopted during the period.