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Note F - Debt Facilities (Details Textual) - USD ($) |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 12, 2016 | Oct. 31, 2016 | Dec. 15, 2015 | Oct. 08, 2014 | Jun. 24, 2013 | Feb. 04, 2013 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015 | Feb. 18, 2016 | Feb. 17, 2016 | Feb. 13, 2014 | Sep. 30, 2012 | Mar. 09, 2012
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 252,000 | $ 214,000 | $ 188,000 |  |  |  |  |
Debt Issuance Costs, Line of Credit Arrangements, Net |  |  |  |  |  |  | 449,000 |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  |  |  | 593,000 | $ 396,000 |  |  |  |  |  |
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 |  |  |  |  |  |  | 413,000 |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Total Increase in Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 27,500,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 200,000,000 |  |  |  |  |  | $ 200,000,000 |  |  | 172,500,000 | $ 145,000,000 |  | $ 145,000,000 | $ 125,000,000
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
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, Additional Borrowing Capacity, Accordion Feature | $ 50,000,000 |  |  |  |  |  | $ 79,000,000 |  |  | $ 55,000,000 |  |  |  |
Debt Agreement, Accounts Receivable Advances, Term Range One, Rate | 55.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Accounts Receivable Advances, Term Range Two, Rate | 50.00% | 45.00% |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 2.375% |  |  |  |  |  |  |
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] | Credit Facilities Amendment Number 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility Increase in Pricing Tiers Percent |  |  |  | 0.125% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract Term of Contracts Included by Credit Facilities Amendment |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Debt Agreement, Accounts Receivable Advances, Term Range One | 3 years 30 days |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Accounts Receivable Advances, Term Range Two | 3 years 210 days |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract Term of Contracts Included by Credit Facilities Amendment |  |  |  |  |  | 3 years 180 days |  |  |  |  |  |  |  |
Debt Agreement, Accounts Receivable Advances, Term Range One | 3 years 180 days |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Accounts Receivable Advances, Term Range Two | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Additional borrowing capacity of line of credit facility with an accordion feature. + 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, after accumulated amortization, of debt issuance costs related to line of credit arrangements. 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 S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + Details
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