Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 97,000	$ 162,000
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	4,000,000	4,000,000
Common stock, shares issued	1,879,319	1,879,319
Common stock, shares outstanding	1,687,319	1,687,319
Treasury stock, shares	192,000	192,000