BENEFIT PLANS (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Share-based Compensation, Total			$ 81,000	$ 45,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 221,000		221,000
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	157,000	$ 225,000	314,000	450,000
Increase (Decrease) in Obligation, Pension Benefits			$ (2,000,000)	(640,000)
Stock Issued During Period, Shares, Restricted Stock Award, Gross			29,200
Non employee Individual of Board of Directors [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based Compensation, Total	20,000		$ 40,000
Equity Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based Compensation, Total	$ 53,000	$ 27,000	$ 81,000	$ 45,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			16,583
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	47,367		47,367