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Note 2 - Acquisition and Divestiture (Details Textual) - USD ($)
$ in Thousands
May 17, 2019
Jun. 01, 2019
Dec. 01, 2018
Goodwill, Ending Balance   $ 1,301,292 $ 1,305,171
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    
Business Combination, Consideration Transferred, Total $ 13,480    
Goodwill, Ending Balance   507  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total   8,800  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Excluding Intangible Assets   $ 4,173