Note 2 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023
Realized Gain (Loss), Foreign Currency Transaction, before Tax	$ (100)	$ (300)
Cash and Cash Equivalents, at Carrying Value	5,845	5,773
Restricted Cash and Cash Equivalents	1,395	1,020
Accounts Receivable, Allowance for Credit Loss, Ending Balance	0
Depreciation	3,800	3,700
Finite-Lived Patents, Gross	2,700	2,700
Finite-Lived Intangible Assets, Accumulated Amortization	2,600	$ 2,600
Finite-Lived Intangible Asset, Expected Amortization, Year One	100
Finite-Lived Intangible Asset, Expected Amortization, Year Two	100
Finite-Lived Intangible Asset, Useful Life (Year)		8 years
Research and Development Expense	500	$ 600
Finite-Lived Intangible Asset, Expected Amortization, Year Three	100
Finite-Lived Intangible Asset, Expected Amortization, Year Four	100
Finite-Lived Intangible Asset, Expected Amortization, Year Five	$ 100
Minimum [Member] | Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	1 year
Maximum [Member] | Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	4 years
Geographic Distribution, Domestic [Member]
Cash and Cash Equivalents, at Carrying Value	$ 100	100
Restricted Cash and Cash Equivalents	0	0
Geographic Distribution, Foreign [Member]
Cash and Cash Equivalents, at Carrying Value	5,700	5,700
Restricted Cash and Cash Equivalents	$ 1,400	$ 1,000