Note 8 - Related Party (Details Textual) - Windset [Member] - USD ($)	3 Months Ended		6 Months Ended
	Nov. 29, 2015	Nov. 30, 2014	Nov. 29, 2015	Nov. 30, 2014	May. 31, 2015
Cost of Sales [Member]
Related Party Transaction, Purchases from Related Party	$ 25,000	$ 297,000	$ 32,000	$ 708,000
Revenue from Related Parties	140,000	$ 161,000	266,000	$ 195,000
Accounts Receivable, Related Parties, Current	282,000		282,000		$ 306,000
Accounts Payable, Related Parties	$ 36,000		$ 36,000		$ 244,000