Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Common Class A [Member]
Common Stock, Par Value (in dollars per share)	$ 0.01	$ 0.01
Common Class B [Member]
Common Stock, Par Value (in dollars per share)	$ 0.01	$ 0.01
Property and equipment, accumulated depreciation and amortization	$ 16,130	$ 15,172
Leased property under capital leases, accumulated depreciation and amortization	$ 4,092	$ 3,867