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Note F - Debt Facilities (Details) (USD $) | 1 Months Ended | 3 Months Ended |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 24, 2013 | Jun. 30, 2013 | Sep. 30, 2012 | Jul. 31, 2013 | Jul. 31, 2012 | Apr. 30, 2013 | Sep. 20, 2012 | Mar. 09, 2012 | Jul. 31, 2013 London Interbank Offered Rate (LIBOR) [Member] | Feb. 04, 2013 Minimum [Member] | Feb. 04, 2013 Maximum [Member]
Note F - Debt Facilities (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  | 2.44% |  | 2.70% |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 145,000,000 |  |  | $ 145,000,000 | $ 125,000,000 |  |  |
Contract Term Of Contracts Included By Credit Facilities Amendment |  |  |  |  |  |  |  |  |  | 36 years | 42 years
Line of Credit Facility, Expiration Date | Jun. 30, 2016 |  |  | Jun. 30, 2016 |  |  |  |  |  |  |
Line of Credit Facility, Additional Borrowing Capacity | 55,000,000 |  |  |  |  |  |  |  |  |  |
Decrease in Pricing Tiers, Percent | 0.25% |  |  |  |  |  |  |  |  |  |
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 2.25% |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  | 2.25% |  |
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 beginning March 9, 2012 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. |  |  |  |  |  |  |
Dividend Restrictions, Maximum Aggregate Amount of Stock Repurchases |  |  |  | 40,000,000 |  |  |  |  |  |  |
Dividend Restrictions, Percentage of Sum of Borrowing Bases |  |  |  | 25.00% |  |  |  |  |  |  |
Dividend Restrictions, Percentage of Consolidated Net income |  |  |  | 75.00% |  |  |  |  |  |  |
Dividend Restrictions, Minimum Percentage of Aggregate Funds Available |  |  |  | 12.50% |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | 42,000,000 |  |  |  |  |  |  |
Debt Issuance Cost |  | 200,000 | 42,000 |  |  |  |  |  |  |  |
Amortization of Financing Costs and Discounts |  |  |  | $ 73,000 | $ 46,000 |  |  |  |  |  |

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- Definition Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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