Note 3 - Accounts Receivable (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($)	Apr. 30, 2023 USD ($)	Apr. 30, 2022 USD ($)	Jan. 31, 2023	Jan. 31, 2022	Dec. 31, 2015 USD ($)
Increase (Decrease) in Accounts Receivable		$ (1,862)	$ (3,493)
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers		1	0
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Concentration Risk, Percentage		18.80%
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers		1			1
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Concentration Risk, Percentage		16.30%		11.90%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts Receivable, after Allowance for Credit Loss		$ 2,700				$ 41,900
Increase (Decrease) in Accounts Receivable	$ (900)	(39,100)
Accounts Receivable, Allowance for Credit Loss		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Noncurrent Assets [Member]
Accounts Receivable, after Allowance for Credit Loss, Noncurrent		$ 1,600