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Note F - Debt Facilities (Details Textual) - USD ($) |  |  |  |  | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2015 | Oct. 08, 2014 | Jun. 24, 2013 | Feb. 04, 2013 | Jan. 31, 2016 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014 | Feb. 18, 2016 | Feb. 17, 2016 | Feb. 13, 2014 | Sep. 30, 2012 | Mar. 09, 2012
Revolving Credit Facility [Member] | Credit Facilities Amendment Number 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  | Oct. 08, 2017 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility Increase in Pricing Tiers Percent |  | 0.125% |  |  |  |  |  |  |  |  |  |  |
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |
Dividend Restrictions Percentage of Sum of Borrowing Bases |  | 30.00% |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Credit Facilities, Amendment Number 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature |  |  | $ 55,000,000 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Decrease in Pricing Tiers, Percent |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Credit Facilities, Amendment Number 4 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Allowable Capital Expenditures By Credit Facilities Amendment |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Contract Term of Contracts Included by Credit Facilities Amendment |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Contract Term of Contracts Included by Credit Facilities Amendment |  |  |  | 3 years 180 days |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.375% | 2.375% |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 172,500,000 |  |  | $ 172,500,000 | $ 145,000,000 |  | $ 145,000,000 | $ 125,000,000
Line of Credit Facility, Expiration Date |  |  | Jun. 24, 2016 |  |  | Oct. 08, 2017 |  |  |  |  |  |  |
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases |  |  |  |  |  | $ 40,000,000 |  |  |  |  |  |  |
Line of Credit Facility, Total Increase in Borrowing Capacity |  |  |  |  |  |  |  |  | 27,500,000 |  |  |  |
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature |  |  |  |  |  |  |  |  | 55,000,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases |  |  |  |  |  | 30.00% |  |  |  |  |  |  |
Line of Credit Facility, Distribution Limitations Percentage of Consolidated Net Income |  |  |  |  |  | 75.00% |  |  |  |  |  |  |
Line of Credit Facility Distribution Limitations Minimum Percentage of Aggregate Funds Available |  |  |  |  |  | 12.50% |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  | $ 61,000,000 |  |  |  |  |  |  |
Note Payable Related to the Property Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 550,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment | $ 10,005 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.50% |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  | $ 516,000 |  |  |  |  |  |  |
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases |  |  |  |  |  | 30.00% |  |  |  |  |  |  |
Line of Credit Facility, Distribution Limitations Percentage of Consolidated Net Income |  |  |  |  |  | 75.00% |  |  |  |  |  |  |
Line of Credit Facility Distribution Limitations Minimum Percentage of Aggregate Funds Available |  |  |  |  |  | 12.50% |  |  |  |  |  |  |
Amortization of Debt Issuance Costs and Discounts |  |  |  |  |  | $ 214,000 | $ 188,000 | $ 209,000 |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  |  | $ 396,000 | $ 464,000 |  |  |  |  |  |

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- Definition Maximum amount of stock repurchases in connection with the distribution limitations in fifth amendment related to repurchases of the Company’s stock. + References No definition available. + Details
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- Definition Percentage of sum of borrowing bases specified in dividend restrictions. + References No definition available. + Details
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- Definition Additional borrowing capacity of line of credit facility with an accordion feature. + References No definition available. + Details
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- Definition Additional borrowing capacity of line of credit facility with an accordion feature. + References No definition available. + Details
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- Definition Represents increase in pricing tiers percentage. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility with an accordion feature. + References No definition available. + Details
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- Definition Amount of increase under the credit facility. + References No definition available. + Details
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- Definition Amount of capital expenditures allowable under Credit Facilities in the aggregate during any fiscal year. + References No definition available. + Details
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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + 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=66902209&loc=d3e3602-108585 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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