Note 5 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Seamap	$ 4,884	$ 8,347	$ 22,684	$ 19,348
Transferred at Point in Time [Member]
Seamap	4,624	8,204	18,689	18,929
Transferred over Time [Member]
Seamap	260	143	3,995	419
Seamap [Member] | Transferred at Point in Time [Member]
Seamap	2,777	6,876	15,059	15,045
Seamap [Member] | Transferred over Time [Member]
Seamap	260	143	1,082	419
Klein [Member] | Transferred at Point in Time [Member]
Seamap	1,847	1,328	3,630	3,884
Klein [Member] | Transferred over Time [Member]
Seamap	0	0	2,913	0
UNITED STATES
Seamap	931	967	5,517	1,545
Europe [Member]
Seamap	1,972	3,491	10,666	9,593
Middle East and Africa [Member]
Seamap	113	120	293	809
Asia Pacific [Member]
Seamap	1,796	3,667	6,022	6,560
Canada and Latin America [Member]
Seamap	$ 72	$ 102	$ 186	$ 841