Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Acummulated Other Comprehensive Income
Balance at Sep. 30, 2017	$ 321,296	$ 122	$ 54,329	$ 310,598	$ (24,999)	$ (18,754)
Balance, shares at Sep. 30, 2017		12,234			(806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(5,662)			(5,662)
Foreign currency translation adjustments	(314)					(314)
Stock-based compensation	1,069		1,069
Stock-based compensation (in shares)		23
Shares withheld in lieu of employee tax withholding	(438)		(438)
Dividends paid	(2,977)			(2,977)
Balance at Dec. 31, 2017	312,974	$ 122	54,960	301,959	$ (24,999)	(19,068)
Balance, shares at Dec. 31, 2017		12,257			(806)
Balance at Sep. 30, 2017	321,296	$ 122	54,329	310,598	$ (24,999)	(18,754)
Balance, shares at Sep. 30, 2017		12,234			(806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(8,992)
Foreign currency translation adjustments	(1,589)
Balance at Mar. 31, 2018	306,392	$ 123	55,958	295,653	$ (24,999)	(20,343)
Balance, shares at Mar. 31, 2018		12,269			(806)
Balance at Dec. 31, 2017	312,974	$ 122	54,960	301,959	$ (24,999)	(19,068)
Balance, shares at Dec. 31, 2017		12,257			(806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,330)			(3,330)
Foreign currency translation adjustments	(1,275)					(1,275)
Stock-based compensation	998		998
Shares withheld in lieu of employee tax withholding			0
Issuance of restricted stock	1
Issuance of restricted stock (In shares)		12
Dividends paid	(2,976)			(2,976)
Balance at Mar. 31, 2018	306,392	$ 123	55,958	295,653	$ (24,999)	(20,343)
Balance, shares at Mar. 31, 2018		12,269			(806)
Balance at Sep. 30, 2018	301,644	$ 123	56,769	291,530	$ (24,999)	(21,779)
Balance, shares at Sep. 30, 2018		12,281			(806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(2,695)			(2,695)
Foreign currency translation adjustments	(4,088)					(4,088)
Stock-based compensation	1,220		1,220
Stock-based compensation (in shares)		41
Shares withheld in lieu of employee tax withholding	(731)		(731)
Dividends paid	(2,992)			(2,992)
Balance at Dec. 31, 2018	292,358	$ 123	57,258	285,843	$ (24,999)	(25,867)
Balance, shares at Dec. 31, 2018		12,322			(806)
Balance at Sep. 30, 2018	301,644	$ 123	56,769	291,530	$ (24,999)	(21,779)
Balance, shares at Sep. 30, 2018		12,281			(806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(1,737)
Foreign currency translation adjustments	(2,368)
Balance at Mar. 31, 2019	292,294	$ 124	57,511	283,805	$ (24,999)	(24,147)
Balance, shares at Mar. 31, 2019		12,353			(806)
Balance at Dec. 31, 2018	292,358	$ 123	57,258	285,843	$ (24,999)	(25,867)
Balance, shares at Dec. 31, 2018		12,322			(806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	958			958
Foreign currency translation adjustments	1,720					1,720
Stock-based compensation	670	$ 1	669
Stock-based compensation (in shares)		17
Shares withheld in lieu of employee tax withholding	(416)		(416)
Issuance of restricted stock (In shares)		14
Dividends paid	(2,996)			(2,996)
Balance at Mar. 31, 2019	$ 292,294	$ 124	$ 57,511	$ 283,805	$ (24,999)	$ (24,147)
Balance, shares at Mar. 31, 2019		12,353			(806)