Annual report pursuant to Section 13 and 15(d)

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details)

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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Valuation and Qualifying Accounts [Abstract]      
Deferred tax assets, beginning balance $ 12,821,094 $ 12,457,023 $ 12,200,329
Additions charged to costs and expenses 0 0 0
Charged to other accounts 305,243 364,071 256,694
Deductions 0 0 0
Deferred tax assets, ending balance $ 13,126,377 $ 12,821,094 $ 12,457,023