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Note 3 - Share-Based Compensation (Details)
1 Months Ended
Jan. 30, 2015
Mar. 31, 2015
May 30, 2014
Restricted Stock [Member] | 2015 LTIP [Member]      
Note 3 - Share-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= usak_LongTermIncentivePlan2015Member
   
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Incentive Plan [Member]      
Note 3 - Share-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= usak_IncentivePlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   396,053us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= usak_IncentivePlanMember