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Costs incurred and estimated earnings net of billings on uncompleted contracts | 12 Months Ended
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Mar. 31, 2013
Contractors [Abstract] |
Costs incurred and estimated earnings net of billings on uncompleted contracts | Costs incurred and estimated earnings net of billings on uncompleted contracts
|  | March 31, 2013 |  |  | March 31, 2012 |
Costs incurred and estimated earnings on uncompleted contracts |  | $ | 512,339 |  |  | $ | 587,220 |
Less billings to date |  | (463,241 | ) |  | (509,511 | )
|  | $ | 49,098 |  |  | $ | 77,709 |
Costs incurred and estimated earnings net of billings on uncompleted contracts is presented in the Consolidated Balance Sheets under the following captions:
|  | March 31, 2013 |  |  | March 31, 2012 |
Unbilled revenue |  | $ | 56,183 |  |  | $ | 86,859 |
Billings in excess of costs incurred and estimated earnings on uncompleted contracts |  | (7,085 | ) |  | (7,514 | )
|  | $ | 49,098 |  |  | $ | 79,345 |
Unbilled revenue related to non-construction activities amounted to $nil (March 31, 2012– $1,636). An amount of $16,139 (March 31, 2012 – $18,302) is recognized within unbilled revenue relating to a single long-term customer contract, whereby the normal operating cycle for this project is greater than one year. As described in note 2(b) the estimated balances within unbilled revenue are subject to uncertainty concerning ultimate realization.

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