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Note 5 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2022
Jul. 31, 2021
Seamap $ 8,713 $ 6,807 $ 17,800 $ 11,001
Transferred at Point in Time [Member]        
Seamap 7,976 6,662 16,977 10,725
Transferred over Time [Member]        
Seamap 737 145 823 276
Seamap [Member] | Transferred at Point in Time [Member]        
Seamap 4,288 5,256 12,281 8,169
Seamap [Member] | Transferred over Time [Member]        
Seamap 737 145 823 276
Klein [Member] | Transferred at Point in Time [Member]        
Seamap 3,688 1,406 4,696 2,556
Klein [Member] | Transferred over Time [Member]        
Seamap 0 0 0 0
UNITED STATES        
Seamap 2,333 219 4,586 578
Europe [Member]        
Seamap 4,082 3,520 8,694 6,102
Middle East and Africa [Member]        
Seamap 142 675 180 689
Asia Pacific [Member]        
Seamap 2,042 2,188 4,226 2,893
Canada and Latin America [Member]        
Seamap $ 114 $ 205 $ 114 $ 739