Consolidated Statements of Stockholders' Equity - 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	(19,242)			(19,242)
Other comprehensive income (loss)	(941)				(941)
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		41,723
Forfeiture of restricted stock, Shares		(1,750)
Stock-based compensation	2,305		2,305
Ending Balance at Sep. 30, 2020	$ 160,970	$ 137	90,965	86,566	(16,698)
Ending Balance, Shares at Sep. 30, 2020	13,670,639	13,670,639
Net loss	$ (14,056)			(14,056)
Other comprehensive income (loss)	378				378
Issuance of common stock pursuant to the vesting of restricted stock units, Shares		70,832
Forfeiture of restricted stock, Shares		(2,500)
Purchase of treasury stock	(6,805)					$ (6,805)
Purchase of treasury stock, Shares		(769,429)
Stock-based compensation	1,970		1,970
Ending Balance at Sep. 30, 2021	$ 142,457	$ 137	$ 92,935	$ 72,510	$ (16,320)	$ (6,805)
Ending Balance, Shares at Sep. 30, 2021	12,969,542	12,969,542