Note 8 - Stock Repurchase Program - Schedule of Stock Purchases (Details) - USD ($)	3 Months Ended							14 Months Ended
	Jan. 31, 2018	[1]	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	[2]	Jan. 31, 2018		Dec. 31, 2016
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plan or Programs	$ 326,000		$ 465,000	$ 468,000	$ 468,000	$ 490,000		$ 326,000	[1]	$ 500
Number of Shares Purchased (in shares)	536,058		8,607		80,426	49,920		675,011
Average Price Paid per Share (in dollars per share)	$ 0.26		$ 0.30		$ 0.27	$ 0.20		$ 0.26
Number of Shares Purchased as Part of Publicly Announced Plans or Programs (in shares)	536,058		8,607		80,426	49,920		675,011

[1] 536,058 shares of common stock purchased were purchased through a private transaction

[2] 49,920 shares of common stock purchased were purchased through a private transaction