CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Other Cumulative Comprehensive Loss	Treasury Stock
Balances (in shares) at Dec. 31, 2017		14,821,801				39,783
Balances at Dec. 31, 2017	$ 105,780	$ 741	$ 76,146	$ 60,074	$ (30,819)	$ (362)
Increase (Decrease) in Stockholders' Equity
Net income	3,920			3,920
Change in cumulative foreign currency translation adjustment	1,605				1,605
Shares issued in connection with stock compensation plans (in shares)		126,493				0
Shares issued in connection with stock compensation plans	0	$ 6	(6)
Stock-based compensation	755		755
Dividends declared	(295)			(295)
Treasury stock activity	(343)		0			$ (343)
Treasury stock purchases (in shares)						(32,321)
Balances (in shares) at Mar. 31, 2018		14,948,294				72,104
Balances at Mar. 31, 2018	111,357	$ 747	76,895	63,634	(29,214)	$ (705)
Balances (in shares) at Dec. 31, 2018		14,987,962				82,186
Balances at Dec. 31, 2018	134,286	$ 749	80,077	89,291	(35,014)	$ (817)
Increase (Decrease) in Stockholders' Equity
Net income	15,170			15,170
Change in cumulative foreign currency translation adjustment	(419)				(419)
Shares issued in connection with stock compensation plans (in shares)		101,118				7,502
Shares issued in connection with stock compensation plans	0	$ 6	(6)
Stock-based compensation	1,051		1,051
Dividends declared	(299)			(299)
Treasury stock activity	(878)					$ (878)
Treasury stock purchases (in shares)						(28,700)
Balances (in shares) at Mar. 31, 2019		15,089,080				103,384
Balances at Mar. 31, 2019	$ 148,911	$ 755	$ 81,122	$ 104,162	$ (35,433)	$ (1,695)