CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income [Member]	Total
Beginning balance at Dec. 31, 2017	$ 114	$ 31,353	$ 24,756	$ (30,110)	$ (99)	$ 26,014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense		161
Issuance of shares from exercise of stock options		94
Relinquishment of stock options and deferred stock units to pay withholding taxes		(246)
Net income			680			680
Dividends declared and paid on common stock			(673)
Purchase of treasury stock				(1,562)
Foreign currency translation adjustment, net of tax					(1)	(1)
Ending balance at Mar. 31, 2018		31,362	24,763	(31,672)	(100)	$ 24,467
Supplemental share information
Issuance of shares from stock awards (in shares)						62,788
Relinquishment of stock awards to pay withholding taxes (in shares)						17,219
Purchase of treasury stock (in shares)						122,780
Dividends declared and paid per common share (in dollars per share)						$ 0.09
Beginning balance at Dec. 31, 2018	$ 115	32,129	27,515	(32,110)	(82)	$ 27,567
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense		173
Issuance of shares from exercise of stock options		0
Relinquishment of stock options and deferred stock units to pay withholding taxes		(199)
Net income			746			746
Dividends declared and paid on common stock			(668)
Purchase of treasury stock				0
Foreign currency translation adjustment, net of tax					9	9
Ending balance at Mar. 31, 2019		$ 32,103	$ 27,593	$ (32,110)	$ (73)	$ 27,628
Supplemental share information
Issuance of shares from stock awards (in shares)						56,998
Relinquishment of stock awards to pay withholding taxes (in shares)						19,637
Purchase of treasury stock (in shares)						0
Dividends declared and paid per common share (in dollars per share)						$ 0.09