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Note 8 - Related Party (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Feb. 26, 2017
Feb. 28, 2016
Feb. 26, 2017
Feb. 28, 2016
Revenue from Related Parties $ 72,000 $ 109,000 $ 265,000 $ 376,000
Accounts Receivable, Related Parties, Current $ 150,000 $ 523,000 $ 150,000 $ 523,000