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Note 9 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Tables) | 3 Months Ended
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Mar. 31, 2013
|  | Three Months Ended March 31, |
|  | 2013 |  |  | 2012 |
Balance, beginning of period |  | $ | 20,046 |  |  | $ | 18,375 |
Net income attributable to noncontrolling interest included in liabilities |  |  | (25 | ) |  |  | 7,713 |
Net income attributable to noncontrolling interest included in equity |  |  | 186 |  |  |  | (18 | )
Accretion of interest on RLW put/call |  |  | -- |  |  |  | 248 |
Change in fair value of RLW put/call |  |  | (58 | ) |  |  | (463 | )
Change in fair value of RHB obligation |  |  | 2,981 |  |  |  | -- |
Balance, end of period |  | $ | 23,130 |  |  | $ | 25,855 |

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- Definition Schedule of Changes in Noncontrolling owner's Interest in Subsidiaries and Joint Ventures [Table Text Block] + References No definition available. + Details
Name: | strl_ScheduleOfChangesInNoncontrollingOwnersInterestInSubsidiariesAndJointVenturesTableTextBlock
Namespace Prefix: | strl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration