Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	21.00%	21.00%	28.10%	35.00%
One-time benefit on re-measurement of net deferred tax liability			$ 9,500,000
Gross tax contingency reserve	$ 968,000	$ 1,670,000	$ 1,298,000
Accrued tax liabilities included in the gross tax contingency reserve	500,000
Accrued interest and penalties included in the gross tax contingency reserve	481,000	669,000
Gross tax contingency reserve, classified as current liabilities	0
Gross tax contingency reserve, classified as noncurrent liabilities	968,000	942,000
Federal [Member]
Income Tax Authority [Line Items]
Prepaid income taxes	$ 5,300,000	$ 5,200,000