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Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts receivable allowance (in Dollars)	$ 1,767us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 1,736us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Drivers' advances and other receivables, allowance (in Dollars)	$ 1,290us-gaap_AllowanceForNotesAndLoansReceivableCurrent	$ 1,337us-gaap_AllowanceForNotesAndLoansReceivableCurrent
Treasury stock shares	0us-gaap_TreasuryStockShares	909,387us-gaap_TreasuryStockShares
Common Class A [Member]
Par value (in Dollars per share)	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Shares authorized	20,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	20,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Shares issued	15,746,609us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	13,469,090us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Shares Outstanding	15,746,609us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	12,559,703us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Class B [Member]
Par value (in Dollars per share)	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Shares authorized	5,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	5,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Shares issued	2,350,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	2,350,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Shares Outstanding	2,350,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	2,350,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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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.

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