Credit Arrangements (Details)	6 Months Ended
	Dec. 31, 2015 USD ($)
Credit agreement capacity	$ 30,000,000
Interest rate over LIBOR	1.00%
Interest rate under prime rate	2.00%
Line of Credit Facility, Amount Outstanding	$ 5,600,000
Assets Held-in-trust	3,400,000
Letters Of Credit [Member]
Credit agreement capacity	4,000,000
Line of Credit Facility, Amount Outstanding	2,300,000
Line of Credit Facility, Remaining Borrowing Capacity	22,100,000
Unsecured [Member]
Credit agreement capacity	10,000,000
Line of Credit Facility, Amount Outstanding	$ 0.3