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BENEFIT PLANS (Details Textual) - USD ($)
3 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Share-based Compensation, Total $ 18,000 $ 15,000
Pension Benefit Plan Accelerated Funding 4,535,000  
Equity Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 113,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 8,000  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 11,250  
Two Thousand Six Equity Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 27,750