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Note F - Debt Facilities (Detail) (USD $)
 1 Months Ended 6 Months Ended
Sep. 30, 2012
Oct. 31, 2012
Oct. 31, 2011
Sep. 20, 2012
Apr. 30, 2012
Mar. 09, 2012
Line of Credit Facility, Interest Rate at Period End   2.714%     2.74%  
Line of Credit Facility, Maximum Borrowing Capacity   $ 145,000,000   $ 145,000,000   $ 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 Credit Facilities is generally LIBOR plus 2.5%.        
Debt Instrument, Basis Spread on Variable Rate   2.50%        
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.        
Line of Credit Facility, Remaining Borrowing Capacity   53,700,000        
Debt Issuance Cost 42,000          
Amortization of Financing Costs and Discounts   $ 110,000 $ 88,000