Note 13 - Preferred Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jul. 12, 2005	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017	Oct. 31, 2017
Preferred Stock, Shares Issued, Total		5,600		5,600		5,600
Preferred Class A [Member]
Preferred Stock, Shares Issued, Total	5,600
Preferred Stock, Dividend Rate, Percentage	7.625%
Preferred Stock, Liquidation Preference Per Share	$ 25,000
Preferred Stock, Depositary Shares, Number of Shares of Preferred Stock in Each Depositary Share	0.001
Payments of Dividends, Total		$ 0	$ 0	$ 0	$ 0