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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Federal statutory rate									$ 1,861	$ 1,837
State taxes, net									393	260
Other permanent items									77	17
Miscellaneous true up of prior year deferred									134	0
Discrete item (a)									3,365	0
Total expense	$ 747	$ 738	$ 627	$ 3,719	$ 769	$ 539	$ 605	$ 201	$ 5,830	$ 2,114

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Represents the portion of the difference between total income tax expense or benefit as reported in the Income Statement for the year and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to permanent items not otherwise specified.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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