Note 3 - Accounts Receivable (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended	106 Months Ended
	Oct. 31, 2024 USD ($)	Oct. 31, 2023	Oct. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)	Jan. 31, 2024	Oct. 31, 2024 USD ($)	Dec. 31, 2015 USD ($)
Increase (Decrease) in Accounts Receivable			$ (6,047)	$ 5,377
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers	0	1	0	0
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers			0		1
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts Receivable, after Allowance for Credit Loss	$ 1,800		$ 1,800			$ 1,800	$ 41,900
Increase (Decrease) in Accounts Receivable			(300)	$ (600)		(40,100)
Accounts Receivable, Allowance for Credit Loss	0		0			0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Noncurrent Assets [Member]
Accounts Receivable, after Allowance for Credit Loss	$ 1,300		$ 1,300			$ 1,300