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Note 4 - Balance Sheet Detail - Balance Sheet Details (Details) - USD ($)
Jul. 31, 2015
Apr. 30, 2015
Accrued expenses    
Project costs $ 1,620,794 $ 867,771
Contract loss reserve 198,819 198,819
Employee incentive payments 748,032 529,274
Accrued salary and benefits 472,270 468,366
Legal and accounting fees 367,854 274,656
Other 218,178 168,233
Accrued expenses total $ 3,625,947 $ 2,507,119