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Note E - Accrued Liabilities (Details) - Accrued liabilities (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Apr. 30, 2012
Accrued liabilities [Abstract]    
Employee compensation $ 5,227 $ 5,063
Cash overdrafts (see Note B) 1,537 128
Deferred service contract revenue (see Note B) 3,464 3,036
Deferred sales tax (see Note B) 2,436 1,785
Interest 237 185
Other 3,224 3,152
$ 16,125 $ 13,349