Changes in Accounting Estimates	12 Months Ended
Changes in Accounting Estimates	Apr. 30, 2014
Changes in Accounting Estimates
Changes in Accounting Estimates	14. Changes in Accounting Estimates During the years ended April 30 2014, 2013 and 2012, the Company revised its estimates at completion of various fixed-price contracts which resulted in cumulative catch up adjustments during the year in which the change in estimate occurred. The change in estimate was a result of the Company changing the total costs required to complete the contracts due to having more accurate cost information as work progressed in subsequent periods on the various contracts. The changes in estimates resulted in cumulative catch-up adjustments to increase income from continuing operations for the years ended April 30, 2014, 2013 and 2012 in the amounts of $362,000, $1,768,000 and $3,065,000, respectively. The changes in estimates resulted in cumulative catch-up adjustments to increase net income for the years ended April 30, 2014, 2013 and 2012 in the amounts of $223,000, $1,081,000 and $1,870,000, respectively. The impact on basic earnings per share for the years ended April 30, 2014, 2013 and 2012 was an increase of $0.01, $0.05 and $0.09 per share, respectively. The impact on diluted earnings per share for the years ended April 30, 2014, 2013 and 2012 was an increase of $0.01, $0.05 and $0.08 per share, respectively.

The entire disclosure for reporting accounting changes and error corrections. It includes the conveyance of information necessary for a user of the Company's financial information to understand all aspects and required disclosure information concerning all changes and error corrections reported in the Company's financial statements for the period.

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