Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jan. 31, 2015	Apr. 30, 2014
Allowance for doubtful accounts receivable	$ 332	$ 222
Property and equipment, accumulated depreciation	31,437	30,545
Capitalized software, accumulated amortization	11,279	8,589
Other intangibles, accumulated amortization	$ 3,609	$ 2,881
Class A treasury stock, shares	4,568,297	4,444,815
Class A Common Shares
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	30,224,833	30,075,187
Class B Common Shares
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	0	0
Common stock, shares outstanding	0	0