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Note 12 - Retirement Benefits (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Foreign Plan [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ 121 $ 253  
Foreign Plan [Member] | UNITED KINGDOM      
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 800    
Foreign Plan [Member] | GERMANY      
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 300    
UNITED STATES      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 232 312  
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 200    
Pension Plan [Member]      
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 1,400    
Defined Benefit Plan, Plan Assets, Contributions by Employer 300 $ 300  
Cooking Solutions Group [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 0   $ 0
Accounting Standards Update 2017-07 [Member] | Reclassification of Net Benefit Costs From Cost of Sales to Other Non-operating Expense [Member] | Quarter Ended September 30, 2017 [Member]      
Prior Period Reclassification Adjustment 200    
Accounting Standards Update 2017-07 [Member] | Reclassification of Net Benefit Costs From Selling, General, and Administrative Expense to Other Non-operating Expense [Member] | Quarter Ended September 30, 2017 [Member]      
Prior Period Reclassification Adjustment $ 400