Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock	In Treasury	Paid-In Capital	Retained Earnings	Total
Beginning balance, shares at Dec. 31, 2017	17,274	(1,266)
Beginning balance, value at Dec. 31, 2017	$ 6,509	$ (11,812)	$ 2,244	$ 49,649	$ 46,590
Cumulative impact of change in accounting principles, net of tax at Dec. 31, 2017
Issuance of common stock in connection with stock-based compensation, shares		16
Issuance of common stock in connection with stock-based compensation, value		$ 151	(54)		97
Treasury stock purchased, shares		(131)
Treasury stock purchased, value		$ (1,052)			(1,052)
Stock-based compensation			5		5
Net loss				70	70
Ending balance, shares at Mar. 31, 2018	17,274	(1,381)
Ending balance, value at Mar. 31, 2018	$ 6,509	$ (12,713)	2,195	49,719	45,710
Beginning balance, shares at Dec. 31, 2017	17,274	(1,266)
Beginning balance, value at Dec. 31, 2017	$ 6,509	$ (11,812)	2,244	49,649	46,590
Cumulative impact of change in accounting principles, net of tax at Dec. 31, 2017
Net loss					(274)
Ending balance, shares at Sep. 30, 2018	17,274	(1,436)
Ending balance, value at Sep. 30, 2018	$ 6,509	$ (12,918)	2,211	49,375	45,177
Beginning balance, shares at Mar. 31, 2018	17,274	(1,381)
Beginning balance, value at Mar. 31, 2018	$ 6,509	$ (12,713)	2,195	49,719	45,710
Cumulative impact of change in accounting principles, net of tax at Mar. 31, 2018
Issuance of common stock in connection with stock-based compensation, shares		6
Issuance of common stock in connection with stock-based compensation, value		$ 52	(17)		35
Treasury stock purchased, shares		(20)
Treasury stock purchased, value		$ (116)			(116)
Stock-based compensation			6		6
Net loss				170	170
Ending balance, shares at Jun. 30, 2018	17,274	(1,395)
Ending balance, value at Jun. 30, 2018	$ 6,509	$ (12,777)	2,184	49,889	45,805
Cumulative impact of change in accounting principles, net of tax at Jun. 30, 2018
Treasury stock purchased, shares		(41)
Treasury stock purchased, value		$ (141)			(141)
Stock-based compensation			27		27
Net loss				(514)	(514)
Ending balance, shares at Sep. 30, 2018	17,274	(1,436)
Ending balance, value at Sep. 30, 2018	$ 6,509	$ (12,918)	2,211	49,375	45,177
Beginning balance, shares at Dec. 31, 2018	17,274	(1,460)
Beginning balance, value at Dec. 31, 2018	$ 6,509	$ (12,970)	2,303	46,563	42,405
Cumulative impact of change in accounting principles, net of tax at Dec. 31, 2018				(53)	(53)
Issuance of common stock in connection with stock-based compensation, shares		41
Issuance of common stock in connection with stock-based compensation, value		$ 351	142		493
Treasury stock purchased, shares		(82)
Treasury stock purchased, value		$ (205)			(205)
Stock-based compensation			218		218
Net loss				(388)	(388)
Ending balance, shares at Mar. 31, 2019	17,274	(1,501)
Ending balance, value at Mar. 31, 2019	$ 6,509	$ (12,824)	2,663	46,122	42,470
Beginning balance, shares at Dec. 31, 2018	17,274	(1,460)
Beginning balance, value at Dec. 31, 2018	$ 6,509	$ (12,970)	2,303	46,563	42,405
Cumulative impact of change in accounting principles, net of tax at Dec. 31, 2018				(53)	(53)
Net loss					(601)
Ending balance, shares at Sep. 30, 2019	17,274	(1,567)
Ending balance, value at Sep. 30, 2019	$ 6,509	$ (12,630)	2,348	45,909	42,136
Beginning balance, shares at Mar. 31, 2019	17,274	(1,501)
Beginning balance, value at Mar. 31, 2019	$ 6,509	$ (12,824)	2,663	46,122	42,470
Cumulative impact of change in accounting principles, net of tax at Mar. 31, 2019
Issuance of common stock in connection with stock-based compensation, shares		62
Issuance of common stock in connection with stock-based compensation, value		$ 527	(548)		(21)
Treasury stock purchased, shares		(74)
Treasury stock purchased, value		$ (180)			(180)
Stock-based compensation			115		115
Net loss				(141)	(141)
Ending balance, shares at Jun. 30, 2019	17,274	(1,513)
Ending balance, value at Jun. 30, 2019	$ 6,509	$ (12,477)	2,230	45,981	42,243
Cumulative impact of change in accounting principles, net of tax at Jun. 30, 2019
Issuance of common stock in connection with stock-based compensation, shares		3
Issuance of common stock in connection with stock-based compensation, value
Treasury stock purchased, shares		(55)
Treasury stock purchased, value		$ (153)			(153)
Stock-based compensation			118		118
Net loss				(72)	(72)
Ending balance, shares at Sep. 30, 2019	17,274	(1,567)
Ending balance, value at Sep. 30, 2019	$ 6,509	$ (12,630)	$ 2,348	$ 45,909	$ 42,136