Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) - Equity Component [Domain] - USD ($)
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Jun. 30, 2015
Apr. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Contract Receivable Retainage $ 1,119,000 $ 635,000    
Accounts Receivable, Net $ 6,494,000      
Contract Receivable Retainage, Description there was one customer of the Suisun City Operations who comprised 61% of the Companys total accounts receivable.      
Concentration Risk, Percentage 60.60% 16.60%    
Fair Value Assumptions, Risk Free Interest Rate 0.97%      
Fair Value Assumptions, Expected Volatility Rate 180.20%      
Fair Value Assumptions, Expected Dividend Payments $ 0      
Cash and Cash Equivalents, at Carrying Value, Total $ 2,364,360 $ 2,177,070 $ 2,364,000 $ 1,410,223
Deferred Tax Assets, Valuation Allowance $ 12,000,000      
Percentage Of Labor Force Subject To Collective Bargaining Agreements 76.00%      
Convertible Series F and F-1 Preferred Stock [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Share Price $ 301.81      
Convertible Series G and G-1 Preferred Stock [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Share Price $ 350.43      
Foreign Financial Institutions [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value, Total $ 1,555,000