Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Accounts receivable, allowance for doubtful accounts	$ 155,000	$ 134,000
Stockholders' equity:
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	4,000,000	4,000,000
Common stock, shares issued	1,852,440	1,834,106
Common stock, shares outstanding	1,660,440	1,642,106
Treasury stock, shares	192,000	192,000