Note 13 - Stock Repurchase Program - Schedule of Stock Purchases (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended										72 Months Ended	87 Months Ended
	Jul. 31, 2023		Apr. 30, 2023	[1]	Jan. 31, 2023	[1]	Oct. 31, 2022	[1]	Jul. 31, 2022	[1]	Apr. 30, 2022	Jul. 31, 2023
Number of Shares Purchased (in shares)	6,863,789	[1]	2,000		85,307		150		1,639		3,290,426	10,243,311
Average Price Paid per Share (in dollars per share)	$ 0.73	[1]	$ 0.68		$ 0.68		$ 0.70		$ 0.84		$ 0.40	$ 0.63
Number of Shares Purchased as Part of Publicly Announced Plans or Programs (in shares)	6,863,789	[1]	2,000		85,307		150		1,639		3,290,426	10,243,311
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plan or Programs	$ 2,560	[1]	$ 2,594		$ 2,595		$ 2,653		$ 2,653		$ 2,655	$ 2,560	[1]
Increase in Program Authorization [Member]
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plan or Programs	$ 7,594											$ 7,594

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