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Note 10 - Comprehensive Income - Components of Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 26, 2017
Feb. 28, 2016
Feb. 26, 2017
Feb. 28, 2016
Balance [1]      
Other comprehensive income before reclassifications, net of tax effect $ 103 430
Amounts reclassified from OCI      
Other comprehensive income, net 103 430
Balance $ 430   $ 430  
[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.