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CONTRACTS IN PROCESS (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Total costs exceeded or were less than billings [Abstract]
Costs incurred and estimated earnings recognized on uncompleted contracts	$ 4,295	$ 6,340
Billings on uncompleted contracts	(4,295)	(5,614)
Total contracts in process	0	726
Balance sheet location of contracts in process [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts	0	726
Billings in excess of costs and estimated earnings on uncompleted contracts	0	0
Total contracts in process	$ 0	$ 726

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 that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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