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Note F - Debt Facilities (Details Textual)							6 Months Ended			9 Months Ended	12 Months Ended	18 Months Ended
	Dec. 15, 2018 USD ($)	Oct. 25, 2018	Mar. 29, 2018	Oct. 25, 2017 USD ($)	Dec. 12, 2016 USD ($)	Oct. 31, 2016	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Oct. 24, 2017 USD ($)	Jul. 31, 2018 USD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Feb. 28, 2016 USD ($)	Dec. 15, 2015 USD ($)
Amortization of Debt Issuance Costs and Discounts, Total							$ 138,000	$ 125,000
Debt Related Commitment Fees and Debt Issuance Costs							5,000	$ 153,000
Debt Issuance Costs, Gross							302,000				$ 302,000	$ 302,000	$ 435,000
Capital Lease Obligations, Total							983,000				983,000	983,000	1,100,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation							95,000				95,000	95,000	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							251,000				251,000	251,000	$ 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		$ 35,000,000				$ 35,000,000	$ 35,000,000
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
Debt Instrument, Interest Rate, Effective Percentage							4.65%				4.65%	4.65%	4.25%
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases									$ 40,000,000	$ 50,000,000	$ 50,000,000
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		2.35%
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, Interest Rate, Increase (Decrease)				3.00%
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] | Maximum [Member]
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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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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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.

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