Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 0	$ 0	$ 0
Federal business tax credits	800,000
Alternative Minimum Tax Credits	1,800,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	1,600,000	1,600,000
Deferred tax assets	62,896,000	83,503,000	90,723,000
Deferred Tax Assets, Net of Valuation Allowance	41,200,000
Valuation allowance	(1,896,000)	(1,613,000)	(1,627,000)
Valuation allowance	283,000	(14,000)	(71,670,000)
Valuation allowance increase (decrease)		0
Unrecognized tax benefits	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 0	0
Income tax penalties and interest expense on unrecognized tax benefits		$ 0	$ 0
Statutory tax rate	28.10%	35.00%	35.00%
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)	$ 18,000,000
Internal Revenue Service (IRS)
Income Tax Disclosure
Operating loss carryforwards	124,900,000
State and Local Jurisdiction
Income Tax Disclosure
Operating loss carryforwards	$ 103,100,000