CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning Balance at Sep. 30, 2019	$ 178,847	$ 136	$ 88,660	$ 105,808	$ (15,757)
Beginning Balance, Shares at Sep. 30, 2019		13,630,666
Net loss	(9,282)			(9,282)
Other comprehensive income (loss)	566				566
Issuance of common stock pursuant to the vesting of restricted stock units	1	$ 1
Issuance of common stock pursuant to the vesting of restricted stock units, Shares		30,823
Stock-based compensation	590		590
Ending Balance at Dec. 31, 2019	170,722	$ 137	89,250	96,526	(15,191)
Ending Balance, Shares at Dec. 31, 2019		13,661,489
Beginning Balance at Sep. 30, 2019	178,847	$ 136	88,660	105,808	(15,757)
Beginning Balance, Shares at Sep. 30, 2019		13,630,666
Net loss	(13,093)
Other comprehensive income (loss)	(451)
Ending Balance at Mar. 31, 2020	166,427	$ 137	89,783	92,715	(16,208)
Ending Balance, Shares at Mar. 31, 2020		13,664,989
Beginning Balance at Dec. 31, 2019	170,722	$ 137	89,250	96,526	(15,191)
Beginning Balance, Shares at Dec. 31, 2019		13,661,489
Net loss	(3,811)			(3,811)
Other comprehensive income (loss)	(1,017)				(1,017)
Issuance of common stock pursuant to the vesting of restricted stock units, Shares		3,500
Stock-based compensation	533		533
Ending Balance at Mar. 31, 2020	166,427	$ 137	89,783	92,715	(16,208)
Ending Balance, Shares at Mar. 31, 2020		13,664,989
Beginning Balance at Sep. 30, 2020	$ 160,970	$ 137	90,965	86,566	(16,698)
Beginning Balance, Shares at Sep. 30, 2020	13,670,639	13,670,639
Net loss	$ (1,050)			(1,050)
Other comprehensive income (loss)	197				197
Issuance of common stock pursuant to the vesting of restricted stock units, Shares		57,332
Purchase of treasury stock	(828)					$ (828)
Purchase of treasury stock, Shares		(117,637)
Stock-based compensation	548		548
Ending Balance at Dec. 31, 2020	159,837	$ 137	91,513	85,516	(16,501)	(828)
Ending Balance, Shares at Dec. 31, 2020		13,610,334
Beginning Balance at Sep. 30, 2020	$ 160,970	$ 137	90,965	86,566	(16,698)
Beginning Balance, Shares at Sep. 30, 2020	13,670,639	13,670,639
Net loss	$ (8,234)
Other comprehensive income (loss)	260
Ending Balance at Mar. 31, 2021	$ 151,695	$ 137	91,992	78,332	(16,438)	(2,328)
Ending Balance, Shares at Mar. 31, 2021	13,465,908	13,465,908
Beginning Balance at Dec. 31, 2020	$ 159,837	$ 137	91,513	85,516	(16,501)	(828)
Beginning Balance, Shares at Dec. 31, 2020		13,610,334
Net loss	(7,184)			(7,184)
Other comprehensive income (loss)	63				63
Issuance of common stock pursuant to the vesting of restricted stock units, Shares		13,500
Forfeiture of restricted stock, Shares		(375)
Purchase of treasury stock	(1,500)					(1,500)
Purchase of treasury stock, Shares		(157,551)
Stock-based compensation	479		479
Ending Balance at Mar. 31, 2021	$ 151,695	$ 137	$ 91,992	$ 78,332	$ (16,438)	$ (2,328)
Ending Balance, Shares at Mar. 31, 2021	13,465,908	13,465,908