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Note F - Debt Facilities (Detail) (USD $)
 3 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Line of Credit Facility, Maximum Borrowing Capacity $ 125,000,000  
Line of Credit Facility, Interest Rate Description The Credit Facilities provide for three pricing tiers for determining the applicable interest rate, based on the Company's consolidated leverage ratio for the preceding fiscal quarter. The current applicable interest rate under the Agreement is generally LIBOR plus 2.5%.  
Line of Credit Facility, Remaining Borrowing Capacity 39,800,000  
Amortization of Financing Costs and Discounts $ 46,000 $ 44,000
Debt Facilities Note [Member]
    
Line of Credit Facility, Dividend Restrictions The distribution limitations under the Credit Facilities allow the Company to repurchase the Company's stock so long as: either (a) the aggregate amount of such repurchases does not exceed $40 million and the sum of borrowing bases combined minus the principal balances of all revolver loans after giving effect to such repurchases is equal to or greater than 25% of the sum of the borrowing bases, or (b) the aggregate amount of such repurchases does not exceed 75% of the consolidated net income of the Company measured on a trailing twelve month basis; provided that immediately before and after giving effect to the stock repurchases, at least 12.5% of the aggregate funds committed under the credit facilities remain available.