CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Other Cumulative Comprehensive Loss	Treasury Stock and Company Stock Held for Deferred Compensation
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 and transfers of stock to rabbit trust (in shares)						(28,700)
Treasury stock activity	(878)					$ (878)
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)
Balances (in shares) at Dec. 31, 2019		15,117,207				464,532
Balances at Dec. 31, 2019	172,141	$ 756	85,639	119,002	(25,803)	$ (7,453)
Increase (Decrease) in Stockholders' Equity
Net income	4,155			4,155
Change in cumulative foreign currency translation adjustment	(840)				(840)
Shares issued in connection with stock compensation plans (in shares)		143,628
Shares issued in connection with stock compensation plans	0	$ 7	(7)
Stock-based compensation	1,200		1,200
Dividends declared	(1,883)			(1,883)
Treasury stock activity and transfers of stock to rabbit trust (in shares)						(45,061)
Treasury stock activity	(1,034)					$ (1,034)
Balances (in shares) at Mar. 31, 2020		15,260,835				509,593
Balances at Mar. 31, 2020	$ 173,689	$ 763	$ 86,832	$ 121,224	$ (26,643)	$ (8,487)