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Costs and estimated earnings on uncompleted contracts Costs and estimated earnings on uncompleted contracts (Tables) | 12 Months Ended
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Jan. 31, 2017
Costs and estimated earnings on uncompleted contracts [Abstract] |
Costs and estimated earnings on uncompleted contracts [Table Text Block] |
| 2016 | 2015
Costs incurred on uncompleted contracts | $82,280 | $78,843
Estimated earnings | 51,546 | 46,359
Earned revenue | 133,826 | 125,202
Less billings to date | 132,835 | 123,915
Costs in excess of billings, net | $991 | $1,287
Balance sheet classification |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | $2,091 | $2,463
Billings in excess of costs and estimated earnings on uncompleted contracts | (1,100) | (1,176)
Costs in excess of billings, net | $991 | $1,287

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- Definition Tabular disclosure of the underlying assumptions and percentages or rates used in determining the fair value of guarantee obligations for each type of long-duration contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14944-158439 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14937-158439 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11318-158416 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 + Details
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