CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning balance at Dec. 31, 2016	$ 112	$ 29,701	$ 24,157	$ (29,752)	$ (109)	$ 24,109
Beginning balance (in shares) at Dec. 31, 2016	7,333,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares from exercise of stock options	$ 2	1,041	0	0	0	1,043
Issuance of shares from exercise of stock options (in shares)	166,600
Issuance of common stock on restricted stock units	$ 0	0	0	0	0	0
Issuance of common stock on restricted stock units (in shares)	8,300
Issuance of common stock on deferred stock units	$ 0	0	0	0	0	0
Issuance of common stock on deferred stock units (in shares)	8,663
Relinquishment of stock options and deferred stock units to pay withholding taxes	$ 0	(29)	0	0	0	(29)
Relinquishment of stock awards and deferred stock units to pay withholding taxes (in shares)	(2,368)
Purchase of treasury stock	$ 0	0	0	(358)	0	(358)
Purchase of treasury stock (in shares)	(36,465)
Dividends declared and paid on common stock	$ 0	0	(2,581)	0	0	(2,581)
Share-based compensation expense	0	609	0	0	0	609
Adjustments upon adoptions of ASU 2016-09	0	31	(31)	0	0	0
Foreign currency translation adjustment, net of tax	0	0	0	0	10	10
Net income	0	0	3,211	0	0	3,211
Ending balance at Dec. 31, 2017	$ 114	31,353	24,756	(30,110)	(99)	26,014
Ending balance (in shares) at Dec. 31, 2017	7,478,094
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares from exercise of stock options	$ 1	415	0	0	0	416
Issuance of shares from exercise of stock options (in shares)	58,146
Issuance of common stock on restricted stock units	$ 0	0	0	0	0	0
Issuance of common stock on restricted stock units (in shares)	33,935
Issuance of common stock on deferred stock units	$ 0	0	0	0	0	0
Issuance of common stock on deferred stock units (in shares)	23,578
Relinquishment of stock options and deferred stock units to pay withholding taxes	$ 0	(268)	0	0	0	(268)
Relinquishment of stock awards and deferred stock units to pay withholding taxes (in shares)	(19,044)
Purchase of treasury stock	$ 0	0	0	(2,000)	0	(2,000)
Purchase of treasury stock (in shares)	(156,410)
Dividends declared and paid on common stock	$ 0	0	(2,667)	0	0	(2,667)
Share-based compensation expense	0	629	0	0	0	629
Foreign currency translation adjustment, net of tax	0	0	0	0	17	17
Net income	0	0	5,426	0	0	5,426
Ending balance at Dec. 31, 2018	$ 115	32,129	27,515	(32,110)	(82)	$ 27,567
Ending balance (in shares) at Dec. 31, 2018	7,418,299					11,463,141
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock on restricted stock units	$ 0	0	0	0	0	$ 0
Issuance of common stock on restricted stock units (in shares)	45,167
Issuance of common stock on deferred stock units	$ 0	0	0	0	0	0
Issuance of common stock on deferred stock units (in shares)	28,231
Relinquishment of stock options and deferred stock units to pay withholding taxes	$ 0	(217)	0	0	0	(217)
Relinquishment of stock awards and deferred stock units to pay withholding taxes (in shares)	(21,449)
Dividends declared and paid on common stock	$ 0	0	(2,683)	0	0	(2,683)
Share-based compensation expense	0	692	0	0	0	692
Foreign currency translation adjustment, net of tax	0	0	0	0	51	51
Net income	0	0	516	0	0	516
Ending balance at Dec. 31, 2019	$ 115	$ 32,604	$ 25,348	$ (32,110)	$ (31)	$ 25,926
Ending balance (in shares) at Dec. 31, 2019	7,470,248					11,515,090