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
Ending balance at Jun. 30, 2018	114	31,533	25,310	(32,110)	(110)	$ 24,737
Supplemental share information
Dividends declared and paid per common share (in dollars per share)						$ 0.27
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		524
Issuance of shares from exercise of stock options		229
Relinquishment of stock options and deferred stock units to pay withholding taxes		(265)
Net income			4,464			4,464
Dividends declared and paid on common stock			(2,001)
Purchase of treasury stock				(2,000)
Foreign currency translation adjustment, net of tax					0	0
Ending balance at Sep. 30, 2018		31,841	27,219	(32,110)	(99)	$ 26,965
Supplemental share information
Issuance of shares from stock awards (in shares)						88,388
Relinquishment of stock awards to pay withholding taxes (in shares)						19,044
Purchase of treasury stock (in shares)						156,410
Dividends declared and paid per common share (in dollars per share)						$ 0.27
Beginning balance at Jun. 30, 2018	114	31,533	25,310	(32,110)	(110)	$ 24,737
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense		187
Issuance of shares from exercise of stock options		121
Relinquishment of stock options and deferred stock units to pay withholding taxes		0
Net income			2,574			2,574
Dividends declared and paid on common stock			(665)
Purchase of treasury stock				0
Foreign currency translation adjustment, net of tax					11	11
Ending balance at Sep. 30, 2018		31,841	27,219	(32,110)	(99)	$ 26,965
Supplemental share information
Issuance of shares from stock awards (in shares)						13,250
Relinquishment of stock awards to pay withholding taxes (in shares)						0
Purchase of treasury stock (in shares)						0
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
Ending balance at Jun. 30, 2019	115	32,301	27,108	(32,110)	17	$ 27,431
Supplemental share information
Dividends declared and paid per common share (in dollars per share)						$ 0.27
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		559
Issuance of shares from exercise of stock options		0
Relinquishment of stock options and deferred stock units to pay withholding taxes		(214)
Net income			1,316			1,316
Dividends declared and paid on common stock			(2,011)
Purchase of treasury stock				0
Foreign currency translation adjustment, net of tax					66	66
Ending balance at Sep. 30, 2019		32,474	26,820	(32,110)	(16)	$ 27,283
Supplemental share information
Issuance of shares from stock awards (in shares)						73,398
Relinquishment of stock awards to pay withholding taxes (in shares)						21,449
Purchase of treasury stock (in shares)						0
Dividends declared and paid per common share (in dollars per share)						$ 0.27
Beginning balance at Jun. 30, 2019	$ 115	32,301	27,108	(32,110)	17	$ 27,431
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		0
Net income			384			384
Dividends declared and paid on common stock			(672)
Purchase of treasury stock				0
Foreign currency translation adjustment, net of tax					(33)	(33)
Ending balance at Sep. 30, 2019		$ 32,474	$ 26,820	$ (32,110)	$ (16)	$ 27,283
Supplemental share information
Issuance of shares from stock awards (in shares)						500
Relinquishment of stock awards to pay withholding taxes (in shares)						0
Purchase of treasury stock (in shares)						0
Dividends declared and paid per common share (in dollars per share)						$ 0.09