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Note 2 - Acquisition and Divestiture (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2019
May 17, 2019
Aug. 31, 2019
Dec. 01, 2018
Goodwill, Ending Balance $ 1,272,165   $ 1,272,165 $ 1,305,171
Dalton Holdings [Member] | Other Income [Member]        
Gain (Loss) on Disposition of Business     16,551  
Ramapo [Member]        
Payments to Acquire Businesses, Gross   $ 7,914    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   3,400    
Business Combination, Consideration Transferred, Receivables Settled   $ 2,166    
Payments for Previous Acquisition     128  
Business Combination, Consideration Transferred, Total 13,608      
Goodwill, Ending Balance 507   507  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total 8,800   8,800  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Excluding Intangible Assets $ 4,301   $ 4,301