Note 6 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Total revenue from contracts with customers	$ 12,105	$ 4,974	$ 31,819	$ 23,132
Sales of marine technology products	12,105	4,974	31,819	23,132
Transferred at Point in Time [Member]
Total revenue from contracts with customers	11,405	4,263	30,443	21,966
Sales of marine technology products	11,405	4,263	30,443	21,966
Transferred over Time [Member]
Total revenue from contracts with customers	700	711	1,376	1,166
Sales of marine technology products	700	711	1,376	1,166
UNITED STATES
Total revenue from contracts with customers	595	353	1,432	852
Sales of marine technology products	595	353	1,432	852
Europe [Member]
Total revenue from contracts with customers	6,162	1,956	15,245	11,013
Sales of marine technology products	6,162	1,956	15,245	11,013
Middle East and Africa [Member]
Total revenue from contracts with customers	4,952	1,653	13,442	10,085
Sales of marine technology products	4,952	1,653	13,442	10,085
Other Countries [Member]
Total revenue from contracts with customers	396	1,012	1,700	1,182
Sales of marine technology products	$ 396	$ 1,012	$ 1,700	$ 1,182