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Note F - Debt Facilities (Details Textual) |  |  |  |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2018 USD ($) | Oct. 25, 2017 USD ($) | Dec. 12, 2016 USD ($) | Oct. 31, 2016 | Dec. 15, 2015 USD ($) | Apr. 30, 2018 USD ($) | Oct. 25, 2017 USD ($) | Oct. 24, 2017 USD ($) | Apr. 30, 2018 USD ($) | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($) | Feb. 18, 2016 USD ($)
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases |  |  |  |  |  |  |  |  | 20.00% |  |  |
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases |  |  |  |  |  | $ 50,000,000 |  | $ 40 |  |  |  |
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, Total |  |  |  |  |  |  |  |  | $ 260,000 | $ 252,000 | $ 214,000 |
Debt Issuance Costs, Gross |  |  |  |  |  | 435,000 |  |  | 435,000 | $ 593,000 |  |
Debt Issuance Costs, Line of Credit Arrangements, Net, Total |  |  |  |  |  | 103,000 |  |  | 103,000 |  |  |
Capital Lease Obligations, Total | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation |  |  |  |  |  | 14,000 |  |  | 14,000 |  |  |
Assets Held under Capital Leases [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |  |  |  |  |  |  |  |  |
Note Payable Related to the Property Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 550,000 |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  | $ 10,005 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.50% |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  | 305,000 |  |  | 305,000 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases |  | $ 50,000,000 | $ 40,000,000 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 200,000,000 |  |  |  |  |  |  |  |  | $ 172,500,000
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature |  |  | $ 50,000,000 |  |  | 46,000,000 |  |  | $ 46,000,000 |  |  |
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% |  |  |  |  |  |  |  |
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases |  | 20.00% |  |  |  |  |  | 25.00% | 20.00% |  |  |
Leverage Ratio, Maximum Threshold |  | 1.75 |  |  |  |  | 1.75 |  |  |  |  |
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases |  |  |  |  |  | $ 50 | $ 40,000,000 |  |  |  |  |
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% |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  | 3.37% |  |
Revolving Credit Facility [Member] | Second Pricing Tier [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  | (0.025%) |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Third Pricing Tier [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  | (0.125%) |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Fourth Pricing Tier [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.875% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
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] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  | 2.35% |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Accounts Receivable Advances, Term Range One |  |  | 3 years 180 days |  |  |  |  |  |  |  |  |
Debt Agreement, Accounts Receivable Advances, Term Range Two |  |  | 5 years |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  | 4.25% |  |  |

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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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