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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (USD $)
In Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2014 $ 119us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 65,850us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 61,082us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (21,703)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 105,348us-gaap_StockholdersEquity
Balance (in Shares) at Dec. 31, 2014 11,873us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net income     1,116us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  1,116us-gaap_NetIncomeLoss
Exercise of stock options   104us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    104us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Exercise of stock options (in Shares) 21us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Excess tax benefit from exercise of stock options   433us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    433us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Share-based compensation   226us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    226us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Restricted stock award grant 1us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(1)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Restricted stock award grant (in Shares) 84us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net share settlement related to restricted stock vesting   (264)usak_NetShareSettlementRelatedToRestrictedStockVestingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    (264)usak_NetShareSettlementRelatedToRestrictedStockVestingValue
Net share settlement related to restricted stock vesting (in Shares) (8)usak_NetShareSettlementRelatedToRestrictedStockVestingShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Balance at Mar. 31, 2015 $ 120us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 66,348us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 62,198us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (21,703)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 106,963us-gaap_StockholdersEquity
Balance (in Shares) at Mar. 31, 2015 11,970us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember