BENEFIT PLANS (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016	Sep. 20, 2016
Defined Benefit Plan Disclosure [Line Items]
Share-based Compensation, Total			$ 99,000	$ 52,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 72,000		72,000
Equity Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based Compensation, Total	$ 19,000	$ 16,000	$ 48,000	$ 53,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			11,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross			19,500
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	26,500		26,500
Stock Returned During Period, Shares, Restricted Stock Award			1,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					500,000
Deferred Compensation Arrangement with Individual, Description			As previously disclosed, on the last trading day of calendar year 2016, and based upon days of service, each non-employee member of the Company’s Board of Directors was issued the number of deferred common share units of the Company under the 2016 Equity Plan equal to $15,000 divided by the closing price per share of common stock reported on the New York Stock Exchange on such date. Based on the closing price per share $7.42 on December 30, 2016, the Company issued a total of 6,873 deferred common share units to members of the Company’s Board of Directors. One former member of the Board of Directors who served as a director during part of calendar year 2016 received a cash payment in lieu of pro rata deferred common share units that would have been earned for services on the Company’s Board of Directors. On the last trading day of each calendar year after calendar year 2016, each non-employee member of the Company’s Board of Directors will be issued the number of deferred common share units of the Company under the 2016 Equity Plan equal to $20,000 divided by the closing price per share of Common Stock reported on the New York Stock Exchange on such date. Director compensation expense is recognized for the annual grant of deferred common share units ratably over the director’s service in office during the calendar year. Through January 31, 2017, the total non-cash director fee compensation related to the deferred common share units was $51,000.
PBGC [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Benefit Plan Accelerated Funding			$ 5,019,000