Note 5 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Total revenue from contracts with customers	$ 12,586	$ 9,087
Transferred at Point in Time [Member]
Total revenue from contracts with customers	11,877	9,002
Transferred over Time [Member]
Total revenue from contracts with customers	709	85
Seamap [Member] | Transferred at Point in Time [Member]
Total revenue from contracts with customers	10,405	7,994
Seamap [Member] | Transferred over Time [Member]
Total revenue from contracts with customers	192	85
Klein [Member] | Transferred at Point in Time [Member]
Total revenue from contracts with customers	1,472	1,008
Klein [Member] | Transferred over Time [Member]
Total revenue from contracts with customers	517	0
UNITED STATES
Total revenue from contracts with customers	1,342	2,253
Europe, Russia and CIS [Member]
Total revenue from contracts with customers	7,035	4,612
Middle East and Africa [Member]
Total revenue from contracts with customers	3,953	2,184
Asia Pacific [Member]
Total revenue from contracts with customers	$ 256	$ 38