Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Allowance for doubtful accounts (in Dollars)	$ 193	$ 183
Preferred stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Common Class A [Member]
Common Stock, Par Value (in Dollars per share)	$ 0.001	$ 0.001
Common Stock, Shares Authorized	60,000,000	60,000,000
Common Stock, Shares Issued	25,372,186	25,285,029
Common Stock, Shares Outstanding	20,808,304	20,768,784
Treasury stock, Shares	4,563,882	4,516,245
Common Class B [Member]
Common Stock, Par Value (in Dollars per share)	$ 0.001	$ 0.001
Common Stock, Shares Authorized	80,000,000	80,000,000
Common Stock, Shares Issued	4,234,643	4,220,117
Common Stock, Shares Outstanding	3,480,217	3,467,410
Treasury stock, Shares	754,426	752,707