Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts Receivable Allowance (in Dollars)	$ 1,711	$ 1,537
Drivers' Advances and Other Receivables Allowance (in Dollars)	$ 730	$ 2,499
Treasury stock shares	1,097,538	1,278,408
Common Class A [Member]
Par value (in Dollars per share)	$ 0.01	$ 0.01
Shares authorized	20,000,000	20,000,000
Shares issued	13,469,090	13,469,090
Shares outstanding	12,371,552	12,190,682
Common Class B [Member]
Par value (in Dollars per share)	$ 0.01	$ 0.01
Shares authorized	5,000,000	5,000,000
Shares issued	2,350,000	2,350,000
Shares outstanding	2,350,000	2,350,000