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Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Accounts Receivable Allowance (in Dollars) | $ 1,736 | $ 1,729
Drivers' Advances and Other Receivables Allowance (in Dollars) | $ 1,337 | $ 1,041
Treasury stock shares | 909,387 | 1,059,643
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 | 12,559,703 | 12,409,447
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

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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