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BENEFIT PLANS (Details Textual) - USD ($)
3 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Share-based Compensation, Total $ 15,000 $ 21,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total 69,000  
Equity Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Share-based Compensation, Total $ 15,000 $ 21,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 5,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 26,000  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 12,000  
PBGC [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Pension Benefit Plan Accelerated Funding $ 5,019,000