Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital & Accumulated Other Comprehensive Loss	Retained Earnings
Beginning balance (shares) at Dec. 31, 2017		20,135,514
Beginning balance at Dec. 31, 2017	$ 290,529	$ 2	$ 98,731	$ 191,796
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	345			345
Purchase of common stock for tax withholding (shares)		(56,269)
Purchase of common stock for tax withholding	(892)		(892)
Amortization of stock-based compensation	1,234		1,234
Cash dividends declared	(2,589)			(2,589)
Common stock repurchase program including commissions (shares)		(127,792)
Common stock repurchase program including commissions	(1,927)		(1,927)
Issuance of restricted stock under the Equity Plan and other (shares)		4,812
Cumulative translation adjustment	(256)		(256)
Ending balance (shares) at Mar. 31, 2018		19,956,265
Ending balance at Mar. 31, 2018	291,088	$ 2	96,890	194,196
Beginning balance (shares) at Dec. 31, 2018		19,389,066
Beginning balance at Dec. 31, 2018	274,554	$ 2	89,258	185,294
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	742			742
Purchase of common stock for tax withholding (shares)		(67,648)
Purchase of common stock for tax withholding	(1,011)		(1,011)
Amortization of stock-based compensation	528		528
Cash dividends declared	(2,479)			(2,479)
Common stock repurchase program including commissions (shares)		(131,012)
Common stock repurchase program including commissions	(1,810)		(1,810)
Issuance of restricted stock under the Equity Plan and other (shares)		13,650
Issuance of restricted stock under the Equity Plan and other	70			70
Cumulative translation adjustment	(60)		(60)
Ending balance (shares) at Mar. 31, 2019		19,204,056
Ending balance at Mar. 31, 2019	$ 270,534	$ 2	$ 86,905	$ 183,627