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)
Foreign currency translation adjustments	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, 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)
Foreign currency translation adjustments	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	13,610,334