SHAREHOLDERS' EQUITY: (Details Textual) - USD ($)	1 Months Ended			3 Months Ended	12 Months Ended
	Sep. 30, 2013	Aug. 30, 2013	Aug. 31, 2012	Jul. 31, 2014	Apr. 30, 2015	Apr. 30, 2014
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					$ 475,000	$ 3,718,000
Stock Issued During Period Value Reduction Of Retained Earnings					15,298,000
Stock Issued During Period Value Reduction Of Treasury Stock					22,442,000
Other Comprehensive Income (Loss), Net of Tax					$ 1,658,000	2,389,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues				825,000	825,000
Stock Issued During Period, Value, New Issues					$ 4,274,000
Common Stock [Member] | Kable Distribution and Palm Coast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, New Issues				$ 83,000
Additional Paid-in Capital [Member] | Kable Distribution and Palm Coast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, New Issues				$ 4,191,000
PBGC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pension Contributions	$ 3,243,000	$ 3,243,000	$ 3,000,000			$ 3,243,000