Note 15 - Segment Reporting - Reconciliation of Operating Income Loss to Loss From Continuing Operations Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 31, 2023		Jul. 31, 2022	Jul. 31, 2023		Jul. 31, 2022
Operating income (loss)	$ (1,548)	[1]	$ (1,551)	$ (1,259)	[1]	$ (4,027)
Interest Expense	(164)			(368)		(4)
Other	295		(76)	388		(190)
Income (loss) from continuing operations before income taxes	(1,417)	[1]	(1,627)	(1,239)	[1]	(4,221)
Corporate, Non-Segment [Member]
Operating income (loss)	(1,794)		(2,337)	(4,094)		(5,064)
Interest Expense	(204)			(408)		(4)
Seamap Marine Products [Member] | Operating Segments [Member]
Operating income (loss)	1,026		292	3,746		1,723
Interest Expense	40			40		0
Klein Marine Products [Member] | Operating Segments [Member]
Operating income (loss)	$ (780)		$ 494	(911)		(686)
Interest Expense				$ 0		$ 0

[1] Reflects the condensed consolidated balance sheet as of July 31, 2023 and condensed consolidated statement of operations for the three and six months ended July 31, 2023 and 2023 in the Form 10-Q.