Material Overcharge Settlement (Details) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 31, 2016	Jun. 30, 2016	Jun. 30, 2016
Loss Contingencies [Line Items]
Litigation Settlement, Amount		$ 423,000	$ 423,000
Defendants | Subsequent events
Loss Contingencies [Line Items]
Additional settlement amount	$ 1,700,000
Defendants | Operating income
Loss Contingencies [Line Items]
Litigation Settlement, Amount		$ 432,000