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Note 6 - Construction Joint Ventures (Tables) | 12 Months Ended
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Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract] |
Condensed Balance Sheet [Table Text Block] |
|  | As of December 31, |
|  | 2014 |  |  | 2013 |
Total combined: |  |  |  |  |  |
Current assets |  | $ | 18,132 |  |  | $ | 51,329 |
Less current liabilities |  |  | (49,035 | ) |  |  | (64,531 | )
Net assets |  | $ | (30,903 | ) |  | $ | (13,202 | )
Backlog |  | $ | 55,063 |  |  | $ | 101,014 |
|  | As of December 31, |
|  | 2014 |  |  | 2013 |
Sterling’s noncontrolling interest in backlog |  | $ | 15,889 |  |  | $ | 30,652 |
Sterling’s receivables from and equity in construction joint ventures |  |  | 9,153 |  |  |  | 6,118 |
Condensed Income Statement [Table Text Block] |
|  | Years Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Total combined: |  |  |  |  |  |  |  |  |
Revenues |  | $ | 51,015 |  |  | $ | 135,699 |  |  | $ | 438,756 |
Income before tax |  |  | 3,606 |  |  |  | (20,758 | ) |  |  | 95,765 |
Sterling’s noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |  |
Share of revenues |  | $ | 20,243 |  |  | $ | 54,096 |  |  | $ | 82,519 |
Share of income before tax |  |  | 2,111 |  |  |  | (11,088 | ) |  |  | 12,424 |

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