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Note E - Accrued Liabilities (Details) - Accrued Liabilities (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2014
Apr. 30, 2013
Accrued Liabilities [Abstract]    
Employee compensation $ 3,228 $ 5,227
Cash overdrafts (see Note B) 1,085 1,537
Deferred service contract revenue (see Note B) 4,234 3,464
Deferred sales tax (see Note B) 2,513 2,436
Interest 212 237
Other 3,786 3,224
$ 15,058 $ 16,125