Quarterly report pursuant to Section 13 or 15(d)

COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS (Details Textual)

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COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Increase In Gross Profit $ 26,000 $ 1,047,000 $ 149,000 $ 1,563,000