Income Taxes (Reconciliation Actual Income Taxes to Expected Federal Corporate Taxes) (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	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Tax expense (benefit) at the federal statutory rate									$ 1,342	$ 3,340	$ (1,890)
Effect of permanent book-tax differences									75	340	1,120
State tax provision									76	100	110
Valuation allowance for net deferred tax assets									617	(1,610)	2,690
Uncertain tax items									(3,013)	350	350
Tax rate differential									1,107	(776)	1,050
Other items									16	0	(330)
Total provision	$ 370	$ 1,390	$ (2,780)	$ 1,240	$ 474	$ 986	$ 194	$ 90	$ 220	$ 1,744	$ 3,100