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Note J - Commitments and Contingencies (Details Textual) $ in Millions | Oct. 31, 2018 USD ($)
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Letters of Credit Outstanding, Amount | $ 1

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant