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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
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Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforward | $ 109,534 us-gaap_OperatingLossCarryforwards
Expires in 2020 [Member] |
Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforward | 15 us-gaap_OperatingLossCarryforwards / us-gaap_StatementScenarioAxis = strl_ExpiresInTwoThousandTwentyMember
Expires in 2021 [Member] |
Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforward | 50 us-gaap_OperatingLossCarryforwards / us-gaap_StatementScenarioAxis = strl_ExpiresIn2021Member
Expires in 2028 [Member] |
Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforward | 8,744 us-gaap_OperatingLossCarryforwards / us-gaap_StatementScenarioAxis = strl_ExpiresInTwoThousandTwentyEightMember
Expires in 2029 [Member] |
Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforward | 3,410 us-gaap_OperatingLossCarryforwards / us-gaap_StatementScenarioAxis = strl_ExpiresIn2029Member
Expires in 2033 [Member] |
Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforward | 70,003 us-gaap_OperatingLossCarryforwards / us-gaap_StatementScenarioAxis = strl_ExpiresInTwoThousandThirtyThreeMember
Expires in 2034 [Member] |
Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforward | $ 27,312 us-gaap_OperatingLossCarryforwards / us-gaap_StatementScenarioAxis = strl_ExpiresIn2034Member

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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