Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Accounts receivable, trade, less allowance for doubtful accounts	$ 1.2	$ 1.1
Common Class A
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	13,401,938	13,401,938
Common stock, shares outstanding	13,401,938	13,401,938
Common Class B
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	5,077,746	5,077,746
Common stock, shares outstanding	5,077,746	5,077,746