Note 6 - Stock Repurchase Program - Schedule of Stock Purchases (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									17 Months Ended
	Apr. 30, 2018	[1]	Jan. 31, 2018	[2]	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	[3]	Apr. 30, 2018		Dec. 31, 2016
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plan or Programs	$ 531		$ 576		$ 715	$ 718	$ 718	$ 740		$ 531	[1]	$ 750
Number of Shares Purchased (in shares)	178,526		536,058		8,607		80,426	49,920		853,537
Average Price Paid per Share (in dollars per share)	$ 0.25		$ 0.26		$ 0.30		$ 0.27	$ 0.20		$ 0.26
Number of Shares Purchased as Part of Publicly Announced Plans or Programs (in shares)	178,526		536,058		8,607		80,426	49,920		853,537
Stock repurchase (in shares)	178,526		536,058		8,607		80,426	49,920		853,537

[1] 178,526 shares of common stock purchased were purchased through a private transaction

[2] 536,058 shares of common stock purchased were purchased through a private transaction

[3] 49,920 shares of common stock purchased were purchased through a private transaction