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, 2016	17,274
Beginning Balance, Treasury stock shares at Dec. 31, 2016		(1,120)
Beginning Balance, Amount at Dec. 31, 2016	$ 6,509	$ (10,340)	$ 2,198	$ 49,995	$ 48,362
Treasury stock purchased, Shares		(117)
Treasury stock purchased, Amount		$ (1,187)			(1,187)
Stock-based compensation			49		49
Net income				1,403	1,403
Ending Balance, Shares at Sep. 30, 2017	17,274
Ending Balance, Treasury stock shares at Sep. 30, 2017		(1,237)
Ending Balance, Amount at Sep. 30, 2017	$ 6,509	$ (11,527)	2,247	51,398	48,627
Beginning Balance, Shares at Dec. 31, 2017	17,274
Beginning Balance, Treasury stock shares at Dec. 31, 2017		(1,266)
Beginning Balance, Amount at Dec. 31, 2017	$ 6,509	$ (11,812)	2,244	49,649	46,590
Issuance of common stock in connection with stock-based compensation, Shares		22
Issuance of common stock in connection with stock-based compensation, Amount		$ 203	(71)		132
Treasury stock purchased, Shares		(192)
Treasury stock purchased, Amount		$ (1,309)			(1,309)
Stock-based compensation			38		38
Net income				(274)	(274)
Ending Balance, Shares at Sep. 30, 2018	17,274
Ending Balance, Treasury stock shares at Sep. 30, 2018		(1,436)
Ending Balance, Amount at Sep. 30, 2018	$ 6,509	$ (12,918)	$ 2,211	$ 49,375	$ 45,177