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Note 10 - Related Party (Details Textual) - Windset [Member] - USD ($)
3 Months Ended 9 Months Ended
Feb. 28, 2016
Mar. 01, 2015
Feb. 28, 2016
Mar. 01, 2015
May. 31, 2015
Cost of Sales [Member]          
Related Party Transaction, Purchases from Related Party $ 0 $ 617,000 $ 32,000 $ 1,300,000  
Revenue from Related Parties 109,000 $ 35,000 376,000 $ 230,000  
Accounts Receivable, Related Parties, Current 342,000   342,000   $ 306,000
Accounts Payable, Related Parties $ 0   $ 0   $ 244,000