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Note 4 - Segment Reporting (Details) - Segment Reporting Information, by Segment (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating revenue    
Revenue $ 132,887us-gaap_Revenues $ 145,489us-gaap_Revenues
Operating income (loss)    
Operating income (loss) 3,591us-gaap_OperatingIncomeLoss (1,043)us-gaap_OperatingIncomeLoss
Depreciation and amortization    
Depreciation and amortization 10,671us-gaap_DepreciationDepletionAndAmortization 11,455us-gaap_DepreciationDepletionAndAmortization
Operating Segments [Member] | Trucking [Member]    
Operating revenue    
Revenue 96,402us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_TruckingMember
[1] 102,914us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_TruckingMember
[1]
Operating income (loss)    
Operating income (loss) 615us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_TruckingMember
(6,120)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_TruckingMember
Depreciation and amortization    
Depreciation and amortization 10,613us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_TruckingMember
11,406us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_TruckingMember
Operating Segments [Member] | SCS [Member]    
Operating revenue    
Revenue 38,671us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_SCSMember
45,252us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_SCSMember
Operating income (loss)    
Operating income (loss) 2,976us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_SCSMember
5,077us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_SCSMember
Depreciation and amortization    
Depreciation and amortization 58us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_SCSMember
49us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_SCSMember
Intersegment Eliminations [Member] | Trucking [Member]    
Operating revenue    
Revenue (615)us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_TruckingMember
(148)us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_TruckingMember
Intersegment Eliminations [Member] | SCS [Member]    
Operating revenue    
Revenue (1,571)us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_SCSMember
(2,529)us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= usak_SCSMember
Trucking [Member]    
Operating revenue    
Revenue 95,787us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= usak_TruckingMember
102,766us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= usak_TruckingMember
SCS [Member]    
Operating revenue    
Revenue $ 37,100us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= usak_SCSMember
$ 42,723us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= usak_SCSMember
[1] Includes foreign revenue of $11.8 million and $14.8 million for the three months ended March 31, 2015 and 2014, respectively.