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Note F - Summary of Revolving Credit Facilities (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 31, 2016
Jan. 31, 2016
Apr. 30, 2016
Feb. 18, 2016
Feb. 17, 2016
Sep. 30, 2012
Mar. 09, 2012
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Interest rate 2.375% 2.375%          
Revolving Credit Facility [Member]              
Aggregate amount $ 172,500,000     $ 172,500,000 $ 145,000,000 $ 145,000,000 $ 125,000,000
Maturity Oct. 08, 2017            
Revolving credit facilities and notes payable $ 117,369,000   $ 107,386,000        
Revolving credit facilities and notes payable $ 117,534,000   $ 107,902,000