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BENEFIT PLANS (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Defined Benefit Plan Disclosure [Line Items]        
Share-based Compensation, Total     $ 37,000 $ 66,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 60,000   60,000  
Equity Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Share-based Compensation, Total $ 16,000 $ 30,000 $ 37,000 $ 66,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     10,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 21,000   21,000  
Stock Issued During Period, Shares, Restricted Stock Award, Gross     3,000  
PBGC [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Accrued Pension Benefit Plan Obligation     $ 5,019,000