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Note 12 - Income Taxes and Deferred Tax Asset/Liability (Details) - Federal and State Income Tax Net Operating Loss Carryforwards (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforward $ 109,534us-gaap_OperatingLossCarryforwards
Expires in 2020 [Member]  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforward 15us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= strl_ExpiresInTwoThousandTwentyMember
Expires in 2021 [Member]  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforward 50us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= strl_ExpiresIn2021Member
Expires in 2028 [Member]  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforward 8,744us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= strl_ExpiresInTwoThousandTwentyEightMember
Expires in 2029 [Member]  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforward 3,410us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= strl_ExpiresIn2029Member
Expires in 2033 [Member]  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforward 70,003us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= strl_ExpiresInTwoThousandThirtyThreeMember
Expires in 2034 [Member]  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforward $ 27,312us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= strl_ExpiresIn2034Member