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Consolidated Condensed Statements of Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
Income Statement [Abstract]        
Income tax benefit (expense) from discontinued operations $ 107 $ (6) $ 107 $ 4