Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Details) - USD ($)	12 Months Ended
	Jun. 30, 2018	Dec. 21, 2017	Jun. 30, 2017	Jun. 30, 2016
Accounting Policies [Abstract]
Accounts Receivable, Purchase Agreement, Maximum Receivable Balances		$ 30,000,000
Accumulated other comprehensive income adjustment for foreign currency	$ (137,000)		$ (93,000)
Accumulated other comprehensive income adjustment for pension plans	354,000		$ 220,000
Accumulated other comprehensive income, available-for-sale securities gains (losses)	0			$ 0
Accounts Receivable, Factored	18,821,000
Accounts Receivable, Factoring Fees	$ 69,000