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Note 16 - Employee Benefit Plans - Plan Asset Assumptions (Details)
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Rate of compensation increase 3.25% 2.90% 3.20%
Rate of compensation increase 2.90% 3.20% 3.60%
Minimum [Member]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 0.73% 0.99% 0.24%
Discount rate 0.99% 0.31% 0.38%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 1.40% 2.30% 2.45%
Maximum [Member]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.00% 2.90% 3.70%
Discount rate 2.90% 3.70% 4.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 6.90% 7.00% 7.00%