Note 5 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Total revenue from contracts with customers	$ 23,107	$ 21,215
UNITED STATES
Total revenue from contracts with customers	2,409	3,687
Europe, Russia and CIS [Member]
Total revenue from contracts with customers	8,821	8,512
Middle East and Africa [Member]
Total revenue from contracts with customers	35	1,226
Asia Pacific [Member]
Total revenue from contracts with customers	11,244	6,523
Canada and Latin America [Member]
Total revenue from contracts with customers	598	1,267
Transferred at Point in Time [Member]
Total revenue from contracts with customers	21,850	20,449
Transferred over Time [Member]
Total revenue from contracts with customers	1,257	766
Seamap [Member] | Transferred at Point in Time [Member]
Total revenue from contracts with customers	16,422	16,304
Seamap [Member] | Transferred over Time [Member]
Total revenue from contracts with customers	871	766
Klein [Member] | Transferred at Point in Time [Member]
Total revenue from contracts with customers	5,428	$ 4,145
Klein [Member] | Transferred over Time [Member]
Total revenue from contracts with customers	$ 386