Income Taxes (Primary Components Of Deferred Tax Assets And (Liabilities)) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	$ 1,455	$ 1,740
Accounts Receivable [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	290	460
Inventory [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	50	(50)
Self Insurance [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	240	560
Payroll and Related [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	610	1,690
Accrued Liabilities [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	1,750	1,240
Property, Plant and Equipment [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	(2,390)	(2,850)
Investment Tax Credit [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	2,550	1,930
Valuation Allowance [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	(1,745)	(1,390)
Other [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	$ 100	$ 150