Note 9 - Stock Repurchase Program - Schedule of Stock Purchases (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended															23 Months Ended
	Jan. 31, 2019	[1]	Oct. 31, 2018	[1]	Jul. 31, 2018	[1]	Apr. 30, 2018	[1]	Jan. 31, 2018	[1]	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	[1]	Oct. 31, 2018		Dec. 31, 2016
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plan or Programs	$ 317		$ 381		$ 525		$ 531		$ 576		$ 715	$ 718	$ 718	$ 740		$ 381	[1]	$ 750
Number of Shares Purchased (in shares)	186,727		480,805		25,277		178,526		536,058		8,607		80,426	49,920		1,546,346
Average Price Paid per Share (in dollars per share)	$ 0.34		$ 0.30		$ 0.26		$ 0.25		$ 0.26		$ 0.30		$ 0.27	$ 0.20		$ 0.28
Number of Shares Purchased as Part of Publicly Announced Plans or Programs (in shares)	186,727		480,805		25,277		178,526		536,058		8,607		80,426	49,920		1,546,346
Quarter ended January 31, 2019 (a) (in shares)	186,727		480,805		25,277		178,526		536,058		8,607		80,426	49,920		1,546,346

[1] These shares of common stock purchased were purchased through private transactions.