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Note 11 - Variable Interest Entities (Details) - Summary Financial Information of Myers Included in the Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Current assets: |  |  |  |
Cash and cash equivalents | $ 17,196 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 22,843 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 1,287 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 1,872 us-gaap_CashAndCashEquivalentsAtCarryingValue
Contracts receivable, including retainage | 94,608 us-gaap_ReceivablesLongTermContractsOrPrograms | 78,896 us-gaap_ReceivablesLongTermContractsOrPrograms |  |
Other current assets | 4,451 us-gaap_OtherAssetsCurrent | 5,278 us-gaap_OtherAssetsCurrent |  |
Total current assets | 157,295 us-gaap_AssetsCurrent | 156,974 us-gaap_AssetsCurrent |  |
Property and equipment, net | 82,541 us-gaap_PropertyPlantAndEquipmentNet | 87,098 us-gaap_PropertyPlantAndEquipmentNet |  |
Goodwill | 54,820 us-gaap_Goodwill | 54,820 us-gaap_Goodwill |  |
Total assets | 301,001 us-gaap_Assets | 306,451 us-gaap_Assets |  |
Current liabilities: |  |  |  |
Accounts payable | 71,462 us-gaap_AccountsPayableCurrent | 66,792 us-gaap_AccountsPayableCurrent |  |
Total current liabilities | 120,242 us-gaap_LiabilitiesCurrent | 104,650 us-gaap_LiabilitiesCurrent |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 605 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 148 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Contracts receivable, including retainage | 28,889 us-gaap_ReceivablesLongTermContractsOrPrograms / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 21,327 us-gaap_ReceivablesLongTermContractsOrPrograms / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Other current assets | 6,986 us-gaap_OtherAssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 7,656 us-gaap_OtherAssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Total current assets | 36,480 us-gaap_AssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 29,131 us-gaap_AssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Property and equipment, net | 9,211 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 9,303 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Goodwill | 1,501 us-gaap_Goodwill / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 1,501 us-gaap_Goodwill / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Total assets | 47,192 us-gaap_Assets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 39,935 us-gaap_Assets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Current liabilities: |  |  |  |
Accounts payable | 21,573 us-gaap_AccountsPayableCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 15,795 us-gaap_AccountsPayableCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Other current liabilities | 9,908 us-gaap_OtherLiabilitiesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 9,000 us-gaap_OtherLiabilitiesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Total current liabilities | 31,481 us-gaap_LiabilitiesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 24,795 us-gaap_LiabilitiesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Long-term liabilities: |  |  |  |
Other long-term liabilities | 8 us-gaap_OtherLiabilitiesNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 16 us-gaap_OtherLiabilitiesNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Total liabilities | $ 31,489 us-gaap_Liabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | $ 24,811 us-gaap_Liabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |

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