SHAREHOLDERS' EQUITY: (Details Textual) (USD $)	3 Months Ended	12 Months Ended			1 Months Ended			12 Months Ended
	Mar. 31, 2014	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012	Sep. 30, 2013 PBGC [Member]	Aug. 30, 2013 PBGC [Member]	Aug. 31, 2012 PBGC [Member]	Apr. 30, 2014 PBGC [Member]	Apr. 30, 2013 PBGC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues	1,199,242
Sale of Stock, Price Per Share	$ 6.25
Proceeds from Sale of Treasury Stock	$ 7,144,000
Share Issuance Expenses	350,000
Pension Contributions		3,718,000	4,572,000	1,407,000	3,243,000	3,243,000	3,000,000	3,243,000	3,000,000
Stock Issued During Period Value Reduction Of Retained Earnings		15,298,000
Stock Issued During Period Value Reduction Of Treasury Stock		22,442,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		$ 2,389,000	$ 734,000	$ 3,158,000
Common Stock Shares Company Agreed To Issue				825,000