Income Taxes (Narrative) (Details) - USD ($)	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Gross tax contingency reserve	$ 1,253,000	$ 968,000	$ 1,670,000
Accrued tax liabilities included in the gross tax contingency reserve	800,000
Accrued interest and penalties included in the gross tax contingency reserve	529,000	481,000
Gross tax contingency reserve, classified as current liabilities	0
Gross tax contingency reserve, classified as noncurrent liabilities	1,253,000	968,000
Federal [Member]
Income Tax Authority [Line Items]
Prepaid income taxes	5,100,000	$ 5,300,000
State and Local Jurisdiction
Income Tax Authority [Line Items]
Prepaid income taxes	$ 1,100,000