Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) (USD $)	Sep. 30, 2013	Dec. 31, 2012
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	1,839,235
Common Class A [Member]
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares outstanding	28,813,293	27,999,068
Common Class B [Member]
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares outstanding	10,659,802	10,792,223