Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income/(Loss)
Balance (in shares) at Sep. 30, 2019		12,373			(806)
Balance at Sep. 30, 2019	$ 299,153	$ 124	$ 59,153	$ 289,422	$ (24,999)	$ (24,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	2,775			2,775
Foreign currency translation adjustments	2,387					2,387
Stock-based compensation (in shares)		30
Stock-based compensation	982		982
Shares withheld in lieu of employee tax withholding	(611)		(611)
Dividends paid	(3,013)			(3,013)
Balance (in shares) at Dec. 31, 2019		12,403			(806)
Balance at Dec. 31, 2019	301,673	$ 124	59,524	289,184	$ (24,999)	(22,160)
Balance (in shares) at Sep. 30, 2020		12,422			(806)
Balance at Sep. 30, 2020	306,626	$ 124	61,998	294,016	$ (24,999)	(24,513)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(364)			(364)
Foreign currency translation adjustments	4,349					4,349
Stock-based compensation (in shares)		59
Stock-based compensation	894	$ 1	893
Shares withheld in lieu of employee tax withholding	(632)		(632)
Dividends paid	(3,028)			(3,028)
Balance (in shares) at Dec. 31, 2020		12,481			(806)
Balance at Dec. 31, 2020	$ 307,845	$ 125	$ 62,259	$ 290,624	$ (24,999)	$ (20,164)