Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Preferred stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Treasury stock, shares	1,639,843	1,639,843
Common Class A [Member]
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares outstanding	27,999,068	27,406,424
Common Class B [Member]
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares outstanding	10,792,223	10,776,697