CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Sep. 30, 2017	$ 194,803	$ 134	$ 83,733	$ 125,166	$ (14,230)
Beginning Balance, Shares at Sep. 30, 2017		13,438,316
Net income (loss)	(9,480)			(9,480)
Other comprehensive income (loss)	(256)				(256)
Issuance of restricted stock		$ 2	(2)
Issuance of restricted stock, Shares		138,650
Forfeiture of restricted stock, Shares		(16,675)
Stock-based compensation	826		826
Ending Balance at Dec. 31, 2017	185,893	$ 136	84,557	115,686	(14,486)
Ending Balance, Shares at Dec. 31, 2017		13,560,291
Beginning Balance at Sep. 30, 2017	194,803	$ 134	83,733	125,166	(14,230)
Beginning Balance, Shares at Sep. 30, 2017		13,438,316
Net income (loss)	(14,209)
Other comprehensive income (loss)	745
Ending Balance at Mar. 31, 2018	182,711	$ 136	85,103	110,957	(13,485)
Ending Balance, Shares at Mar. 31, 2018		13,578,916
Beginning Balance at Dec. 31, 2017	185,893	$ 136	84,557	115,686	(14,486)
Beginning Balance, Shares at Dec. 31, 2017		13,560,291
Net income (loss)	(4,729)			(4,729)
Other comprehensive income (loss)	1,001				1,001
Issuance of restricted stock, Shares		16,800
Forfeiture of restricted stock, Shares		(1,375)
Issuance of common stock pursuant to the exercise of stock options	28		28
Issuance of common stock pursuant to the exercise of stock options, Shares		3,200
Stock-based compensation	518		518
Ending Balance at Mar. 31, 2018	182,711	$ 136	85,103	110,957	(13,485)
Ending Balance, Shares at Mar. 31, 2018		13,578,916
Beginning Balance at Sep. 30, 2018	$ 176,587	$ 136	86,116	105,954	(15,619)
Beginning Balance, Shares at Sep. 30, 2018	13,600,541	13,600,541
Net income (loss)	$ (5,853)			(5,853)
Other comprehensive income (loss)	(154)				(154)
Issuance of restricted stock, Shares		8,000
Forfeiture of restricted stock, Shares		(250)
Issuance of common stock pursuant to the exercise of stock options	215		215
Issuance of common stock pursuant to the exercise of stock options, Shares		24,500
Stock-based compensation	602		602
Ending Balance at Dec. 31, 2018	171,397	$ 136	86,933	100,101	(15,773)
Ending Balance, Shares at Dec. 31, 2018		13,632,791
Beginning Balance at Sep. 30, 2018	$ 176,587	$ 136	86,116	105,954	(15,619)
Beginning Balance, Shares at Sep. 30, 2018	13,600,541	13,600,541
Net income (loss)	$ (5,146)
Other comprehensive income (loss)	103
Ending Balance at Mar. 31, 2019	$ 172,953	$ 136	87,525	100,808	(15,516)
Ending Balance, Shares at Mar. 31, 2019	13,632,291	13,632,291
Beginning Balance at Dec. 31, 2018	$ 171,397	$ 136	86,933	100,101	(15,773)
Beginning Balance, Shares at Dec. 31, 2018		13,632,791
Net income (loss)	707			707
Other comprehensive income (loss)	257				257
Forfeiture of restricted stock, Shares		(1,000)
Issuance of common stock pursuant to the exercise of stock options, Shares		500
Stock-based compensation	592		592
Ending Balance at Mar. 31, 2019	$ 172,953	$ 136	$ 87,525	$ 100,808	$ (15,516)
Ending Balance, Shares at Mar. 31, 2019	13,632,291	13,632,291