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Note 1 - Management Statement (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Jul. 01, 2017
Retained Earnings (Accumulated Deficit), Ending Balance $ 760,397 $ 773,938   $ 761,430  
Cost of Goods and Services Sold, Total   123,828 $ 123,471    
Accrued Liabilities, Current, Total 67,077 57,136   $ 57,679  
Reclassified Net Benefit Costs from Cost of Sales to Other Expense Non-operating [Member] | Three Months Ended September 30, 2017 [Member]          
Prior Period Reclassification Adjustment   200      
Reclassified Net Benefit Costs from Selling, General and Administrative Expenses to Other Expense Non-operating [Member] | Three Months Ended September 30, 2017 [Member]          
Prior Period Reclassification Adjustment   $ 400      
Accounting Standards Update 2014-09 [Member]          
Retained Earnings (Accumulated Deficit), Ending Balance (1,033)       $ (1,000)
Cost of Goods and Services Sold, Total (574)        
Accrued Liabilities, Current, Total 1,502        
Accounting Standards Update 2014-09 [Member] | Engineering Technologies Group [Member]          
Retained Earnings (Accumulated Deficit), Ending Balance 100       $ 100
Cost of Goods and Services Sold, Total 600        
Accrued Liabilities, Current, Total $ (1,500)