Income Taxes (Primary Components Of Deferred Tax Assets And (Liabilities)) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	$ 7,564	$ 1,455
Accounts Receivable [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	260	290
Inventory [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	40	50
Self-Insurance [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	200	240
Payroll and Related [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	570	610
Accrued Liabilities [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	2,960	1,750
Property, Plant and Equipment [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	(3,200)	(2,390)
Investment Tax Credit [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	2,340	2,550
Valuation Allowance [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	(1,700)	(1,745)
Net Operating Loss Carryover [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	5,940
Other [Member]
Components Of Deferred Tax Assets And Liabilities [Line Items]
Long-term	$ 150	$ 100