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Costs and estimated earnings on uncompleted contracts Costs and estimated earnings on uncompleted contracts (Details) - USD ($) $ in Thousands | Jan. 31, 2018 | Jan. 31, 2017
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Costs incurred on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 11,955 | $ 17,015
Estimated earnings | 6,336 | 16,137
Earned revenue | 18,291 | 33,152
Less Billings to date | 18,756 | 32,161
Costs in excess of billings, net | (465) | 991
Costs and estimated earnings in excess of billings on uncompleted contracts | 1,502 | 2,091
Billings in excess of costs and estimated earnings on uncompleted contracts | $ (1,967) | $ (1,100)

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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57807-111642 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57788-111642 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57795-111642 + Details
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