Note 4 - Discontinued Operations - Held for Sale and Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023
Net loss from discontinued operations	$ 0	$ (736)	$ 0	$ (852)
Discontinued Operations, Disposed of by Sale [Member]
Revenue from discontinued operations	0	1,189	0	3,178
Cost of discontinued operations	0	863	0	1,971
Selling, general and administrative	0	600	0	1,168
Research and development	0	349	0	644
Depreciation and amortization	0	158	0	306
Total operating expenses	0	1,107	0	2,118
Operating loss	0	(781)	0	(911)
Other income	0	55	0	76
Loss before income taxes from discontinued operations	0	(726)	0	(835)
Provision for income taxes from discontinued operations	0	(10)	0	(17)
Net loss from discontinued operations	0	(736)	$ 0	$ (852)
Depreciation and amortization	$ 0	$ 306