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Note 8 - Debt (Details Textual)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Extraordinary and Certain Other Defined Items Excluded from Adjusted EBIT $ 20,000 $ 7,500    
Extraordinary and Certain Other Defined Items Excluded from Adjusted EBIT, Percentage of EBITDA 10.00%      
Interest Coverage Ratio, Actual     9.09  
Leverage Ratio, Requirement, Maximum Under Certain Circumstances in Connection Material Acquisition 4.0      
Leverage Ratio, Actual     1.47  
Long-term Line of Credit, Total     $ 200,000  
Line of Credit Facility, Interest Rate at Period End     2.59%  
Disposal Group, Including Discontinued Operation, Consideration     $ 0 $ 0
Interest Rate Swap [Member]        
Derivative, Notional Amount     $ 200,000  
Derivative, Average Fixed Interest Rate     1.27%  
Discontinued Operations [Member] | Refrigerated Solutions Group [Member]        
Disposal Group, Including Discontinued Operation, Consideration     $ 10,600  
Minimum [Member]        
Interest Coverage Ratio, Requirement 2.75      
Maximum [Member]        
Leverage Ratio, Requirement 3.5      
Amended and Restated Credit Agreement [Member]        
Debt Instrument, Term (Year) 5 years      
Line of Credit Facility, Maximum Borrowing Capacity $ 500,000   203,600  
Line Of Credit, Accordion Feature 250,000      
Swing Line Loan [Member]        
Line of Credit Facility, Maximum Borrowing Capacity 10,000      
Letter of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity 35,000      
Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 400,000      
Standby Letters of Credit [Member]        
Long-term Line of Credit, Total     $ 7,300 $ 7,600