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, 2018	$ 115	$ 32,129	$ 27,515		$ (82)	$ 27,567
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense		173
Issuance of shares from exercise of stock options		0				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)
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
Dividends declared and paid per common share (in dollars per share)						$ 0
Beginning balance at Dec. 31, 2019	115	32,604	25,348		(31)	$ 25,926
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense		187
Issuance of shares from exercise of stock options		353				1
Relinquishment of stock options and deferred stock units to pay withholding taxes		(41)
Net income			(992)			(992)
Dividends declared and paid on common stock			0
Foreign currency translation adjustment, net of tax					71	71
Ending balance at Mar. 31, 2020	$ 116	$ 33,103	$ 24,356	$ (32,110)	$ 40	$ 25,505
Supplemental share information
Issuance of shares from stock awards (in shares)						82,525
Relinquishment of stock awards to pay withholding taxes (in shares)						14,088
Dividends declared and paid per common share (in dollars per share)						$ 0