Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock Outstanding [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Sep. 30, 2017	22,448,056
Balance at Sep. 30, 2017		$ 23	$ 55,678	$ 78,846	$ (664)	$ 133,883
Net income				5,181		5,181
Share-based compensation (in shares)	1,226
Share-based compensation			147		9	156
Repurchase of common stock (in shares)	(101,573)
Repurchase of common stock					(581)	(581)
Balance (in shares) at Dec. 31, 2017	22,347,709
Balance at Dec. 31, 2017		23	55,825	84,027	(1,236)	138,639
Balance (in shares) at Sep. 30, 2018	22,373,382
Balance at Sep. 30, 2018		23	56,236	91,507	(1,040)	146,726
Net income				2,197		2,197
Share-based compensation (in shares)	18,928
Share-based compensation			101		144	$ 245
Repurchase of common stock (in shares)						0
Balance (in shares) at Dec. 31, 2018	22,392,310
Balance at Dec. 31, 2018		$ 23	$ 56,337	$ 93,704	$ (896)	$ 149,168