Note 5 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Total revenue from contracts with customers	$ 9,087	$ 4,194
Transferred at Point in Time [Member]
Total revenue from contracts with customers	9,002	4,063
Transferred over Time [Member]
Total revenue from contracts with customers	85	131
Seamap [Member] | Transferred at Point in Time [Member]
Total revenue from contracts with customers	7,994	2,913
Seamap [Member] | Transferred over Time [Member]
Total revenue from contracts with customers	85	131
Klein [Member] | Transferred at Point in Time [Member]
Total revenue from contracts with customers	1,008	1,150
Klein [Member] | Transferred over Time [Member]
Total revenue from contracts with customers	0
UNITED STATES
Total revenue from contracts with customers	2,253	359
Europe [Member]
Total revenue from contracts with customers	4,612	2,582
Middle East and Africa [Member]
Total revenue from contracts with customers	38	14
Asia Pacific [Member]
Total revenue from contracts with customers	2,184	705
Canada and Latin America [Member]
Total revenue from contracts with customers	$ 0	$ 534