Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
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	$ 0	0	2,197	0	2,197
Share-based compensation (in shares)	18,928
Share-based compensation	$ 0	101	0	144	245
Balance (in shares) at Dec. 31, 2018	22,392,310
Balance at Dec. 31, 2018	$ 23	56,337	93,704	(896)	149,168
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					8,055
Balance (in shares) at Jun. 30, 2019	22,454,205
Balance at Jun. 30, 2019	$ 23	56,162	99,562	(426)	155,321
Balance (in shares) at Dec. 31, 2018	22,392,310
Balance at Dec. 31, 2018	$ 23	56,337	93,704	(896)	149,168
Net income	$ 0	0	3,860	0	3,860
Share-based compensation (in shares)	39,243
Share-based compensation	$ 0	(145)	0	298	153
Balance (in shares) at Mar. 31, 2019	22,431,553
Balance at Mar. 31, 2019	$ 23	56,192	97,564	(598)	153,181
Net income	$ 0	0	1,998	0	1,998
Share-based compensation (in shares)	22,652
Share-based compensation	$ 0	(30)	0	172	142
Balance (in shares) at Jun. 30, 2019	22,454,205
Balance at Jun. 30, 2019	$ 23	56,162	99,562	(426)	155,321
Balance (in shares) at Sep. 30, 2019	22,463,057
Balance at Sep. 30, 2019	$ 23	56,319	100,923	(359)	156,906
Net income	0	0	1,868	0	1,868
Cash dividends	$ 0	0	(1,573)	0	(1,573)
Share-based compensation (in shares)	12,661
Share-based compensation	$ 0	135	0	96	231
Topic 842 transition impact	$ 0	0	1,660	0	1,660
Balance (in shares) at Dec. 31, 2019	22,475,718
Balance at Dec. 31, 2019	$ 23	56,454	102,878	(263)	159,092
Balance (in shares) at Sep. 30, 2019	22,463,057
Balance at Sep. 30, 2019	$ 23	56,319	100,923	(359)	156,906
Net income					16,277
Balance (in shares) at Jun. 30, 2020	22,524,341
Balance at Jun. 30, 2020	$ 23	56,472	114,135	0	170,630
Balance (in shares) at Dec. 31, 2019	22,475,718
Balance at Dec. 31, 2019	$ 23	56,454	102,878	(263)	159,092
Net income	0	0	9,718	0	9,718
Cash dividends	$ 0	0	(1,574)	0	(1,574)
Share-based compensation (in shares)	28,092
Share-based compensation	$ 0	(15)	0	214	199
Balance (in shares) at Mar. 31, 2020	22,503,810
Balance at Mar. 31, 2020	$ 23	56,439	111,022	(49)	167,435
Net income	0	0	4,691	0	4,691
Cash dividends	$ 0	0	(1,578)	0	(1,578)
Share-based compensation (in shares)	6,469
Share-based compensation	$ 0	33	0	49	82
Issuance of common stock.. (in shares)	14,062
Issuance of common stock..	$ 0	0	0	0	0
Balance (in shares) at Jun. 30, 2020	22,524,341
Balance at Jun. 30, 2020	$ 23	$ 56,472	$ 114,135	$ 0	$ 170,630