Note 14 - Segment Reporting - Reconciliation of Operating Income Loss to Loss From Continuing Operations Before Income Taxes (Details) - USD ($)	3 Months Ended		21843 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2022
Operating loss	$ 289,000	$ (2,476,000)	$ (2,476,000)
Interest Expense	(204,000)	(4,000)	(4,000)
Other	93,000		(114,000)
Income (loss) from continuing operations before income taxes	178,000	(2,594,000)	(2,594,000)
Corporate, Non-Segment [Member]
Operating loss	(2,300,000)	(2,727,000)	(2,727,000)
Interest Expense	(204,000)	(4,000)
Seamap Marine Products [Member] | Operating Segments [Member]
Operating loss	2,720,000	1,431,000	1,431,000
Interest Expense	0	0
Klein Marine Products [Member] | Operating Segments [Member]
Operating loss	(131,000)	(1,180,000)	$ (1,180,000)
Interest Expense	$ 0	$ 0