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Note 16 - Employee Benefit Plans (Details Textual)
$ in Millions
 12 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2021
USD ($)
Defined Benefit Plan, Accumulated Benefit Obligation $ 206.6 $ 226.8  
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year $ 3.2    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 5.60%    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets 6.50%    
Defined Benefit Plan, Expected Future Benefit Payment, Year One $ 17.6    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 17.6    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 17.5    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 17.3    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 17.4    
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years 81.7    
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 10.2    
Retirement Savings Plans [Member]      
Defined Contribution Plans Number of Plans   2  
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 3.0 $ 2.9 $ 2.9
Retirement Savings Plans [Member] | Salaried Employees [Member]      
Defined Contribution Plans Number of Plans   1  
Defined Contribution Plan Company Stock Held in Plan (in shares) | shares   88,000  
Defined Contribution Plan Company Stock, Percentage of Plan Assets   4.60%  
Retirement Savings Plans [Member] | Hourly Employees [Member]      
Defined Contribution Plans Number of Plans   1