CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock and Paid-in Capital	Common Stock	Unamortized Cost of Equity Awards	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balances at Dec. 31, 2017	$ 31,051	$ 34,473	$ (3,422)	$ 61,882	$ (5,586)	$ 87,347
Balances (in shares) at Dec. 31, 2017		9,427
Increase (Decrease) in Stockholders' Equity
Stock transactions under employee benefit stock plans	849	$ 849				849
Stock transactions under employee benefit stock plans (in shares)		26
Issuance of restricted stock, net of forfeitures	2	$ 1,535	(1,533)			2
Issuance of restricted stock, net of forfeitures (in shares)		40
Stock-based compensation expense	1,555		1,555			1,555
Shares withheld for payment of employee payroll taxes	(590)	$ (590)				(590)
Shares withheld for payment of employee payroll taxes (in shares)		(17)
Foreign currency translation adjustments					(2,152)	(2,152)
Accumulated loss on derivatives					988	988
Net income				13,289		13,289
Dividends to stockholders				(805)		(805)
Balances at Sep. 30, 2018	32,867	$ 36,267	(3,400)	74,366	(6,750)	100,483
Balances (in shares) at Sep. 30, 2018		9,476
Balances at Jun. 30, 2018	32,315	$ 36,628	(4,313)	69,790	(6,580)	95,525
Balances (in shares) at Jun. 30, 2018		9,475
Increase (Decrease) in Stockholders' Equity
Issuance of restricted stock, net of forfeitures		$ (361)	361
Issuance of restricted stock, net of forfeitures (in shares)		1
Stock-based compensation expense	552		552			552
Foreign currency translation adjustments					(307)	(307)
Accumulated loss on derivatives					137	137
Net income				4,860		4,860
Dividends to stockholders				(284)		(284)
Balances at Sep. 30, 2018	32,867	$ 36,267	(3,400)	74,366	(6,750)	100,483
Balances (in shares) at Sep. 30, 2018		9,476
Balances at Dec. 31, 2018	33,613	$ 36,779	(3,166)	76,718	(8,518)	$ 101,813
Balances (in shares) at Dec. 31, 2018		9,485				9,485
Increase (Decrease) in Stockholders' Equity
Stock transactions under employee benefit stock plans	1,088	$ 1,088				$ 1,088
Stock transactions under employee benefit stock plans (in shares)		27
Issuance of restricted stock, net of forfeitures	329	$ 4,475	(4,146)			329
Issuance of restricted stock, net of forfeitures (in shares)		107
Stock-based compensation expense	2,117		2,117			2,117
Shares withheld for payment of employee payroll taxes	(710)	$ (710)				(710)
Shares withheld for payment of employee payroll taxes (in shares)		(19)
Foreign currency translation adjustments					(2,708)	(2,708)
Accumulated loss on derivatives					(1,042)	(1,042)
Tax effect of derivative transactions					239	239
Net income				13,533		13,533
Dividends to stockholders				(863)		(863)
Balances at Sep. 30, 2019	36,437	$ 41,632	(5,195)	89,388	(12,029)	$ 113,796
Balances (in shares) at Sep. 30, 2019		9,600				9,600
Balances at Jun. 30, 2019	35,697	$ 41,632	(5,935)	85,058	(9,555)	$ 111,200
Balances (in shares) at Jun. 30, 2019		9,600
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	740		740			740
Foreign currency translation adjustments					(2,369)	(2,369)
Accumulated loss on derivatives					(135)	(135)
Tax effect of derivative transactions					30	30
Net income				4,618		4,618
Dividends to stockholders				(288)		(288)
Balances at Sep. 30, 2019	$ 36,437	$ 41,632	$ (5,195)	$ 89,388	$ (12,029)	$ 113,796
Balances (in shares) at Sep. 30, 2019		9,600				9,600