Note 12 - Stock Repurchase Program - Schedule of Stock Purchases (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended										51 Months Ended	66 Months Ended
	Oct. 31, 2021	[1]	Jul. 31, 2021	[1]	Apr. 30, 2021	[1]	Jan. 31, 2021	[1]	Oct. 31, 2020	[1]	Jul. 31, 2020	Oct. 31, 2021
Number of Shares Purchased (in shares)	6,290		0		17,303		0		152,915		2,933,415	3,109,923
Average Price Paid per Share (in dollars per share)	$ 0.62		$ 0		$ 0.65		$ 0		$ 0.50		$ 0.37	$ 0.38
Number of Shares Purchased as Part of Publicly Announced Plans or Programs (in shares)	6,290		0		17,303		0		152,915		2,933,415	3,109,923
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plan or Programs	$ 2,819		$ 2,823		$ 2,823		$ 2,835		$ 2,835		$ 2,911	$ 2,819	[1]

[1] These shares of common stock were purchased through a private transaction