Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Oct. 31, 2011	Apr. 30, 2011
Allowances for doubtful accounts receivable	$ 251	$ 243
Property and equipment, accumulated depreciation	28,041	27,430
Capitalized software, accumulated amortization	3,913	9,323
Other intangibles, accumulated amortization	$ 3,852	$ 3,539
Class A treasury stock, shares	4,348,663	4,348,663
Class A
Common stock, par value	$ 0.1	$ 0.1
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	28,075,716	27,651,615
Class B
Common stock, par value	$ 0.1	$ 0.1
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	2,587,086	2,747,086
Common stock, shares outstanding	2,587,086	2,747,086