SUBSEQUENT EVENTS: (Details Textual) (USD $)	1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended
	Aug. 31, 2012	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011	Jun. 30, 2013 Subsequent Event [Member]	Apr. 30, 2013 Subsequent Event [Member]	Jun. 27, 2013 Subsequent Event [Member]
Common stock, shares issued		7,420,704	7,420,704				1,199,242
Common stock, par value (in dollars per share)		$ 0.10	$ 0.10				$ 6.25
Proceeds from Issuance of Common Stock					$ 7,100,000
Pension Contributions	3,000,000	4,572,000	1,407,000	1,075,000	3,000,000
Payment of Financing and Stock Issuance Costs, Total					$ 400,000
Subscription Fulfillment Services Expiration Date						2015-02-28
Subscription Fulfillment Services Description						This customer contract represented approximately 15.6% of revenues for the Company’s Subscription Fulfillment Services business for the year ended April 30, 2013 (or 10.8% of the Company’s consolidated revenues for that period), and the loss of this revenue following the expiration of the contract in February 2015 could have a material adverse effect on the Company’s Subscription Fulfillment Services business, financial condition and results of operations.