Note 4 - Discontinued Operations - Held for Sale and Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 21, 2023	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022	Jan. 31, 2023
Total current assets of discontinued operations		$ 0		$ 0		$ 5,783
Total liabilities of discontinued operations		0		0		2,420
Net income (loss) from discontinued operations		2,277	$ (2,276)	1,424	$ (2,683)
Klein Marine Services, Inc. [Member]
Gain (Loss) on Disposition of Business	$ 2,400	2,393		2,393	(0)
Gain on sale of Klein	$ (2,400)	(2,393)		(2,393)	0
Discontinued Operations, Held-for-Sale [Member]
Accounts receivable, net						746
Inventories, net						4,292
Prepaid expenses and other current assets						745
Total current assets of discontinued operations						5,783
Property and equipment, net						2,992
Intangible assets, net						1,297
Total assets of discontinued operations						10,072
Accounts payable						1,607
Accrued and other liabilities						813
Total liabilities of discontinued operations						$ 2,420
Revenue from discontinued operations		140	1,847	3,318	6,543
Cost of discontinued operations		11	1,230	1,982	3,981
Selling, general and administrative		179	680	1,348	2,109
Research and development		45	431	689	1,628
Depreciation and amortization		18	136	324	402
Total operating expenses		242	1,247	2,361	4,139
Operating loss		(113)	(630)	(1,025)	(1,577)
Other income (expense) (Including $1,626 of currency translation loss for the three and nine months ended October 31, 2022.)		2	(1,646)	73	(1,106)
Income (loss) before income taxes from discontinued operations		2,282	(2,276)	1,441	(2,683)
Provision for income taxes from discontinued operations		(5)	0	(17)	0
Net income (loss) from discontinued operations		2,277	(2,276)	1,424	(2,683)
Gross profit from sale of assets held-for-sale				0	(382)
Non-Cash cumulative translation adjustment for discontinued operations				0	1,626
Sale of assets held for sale				0	383
Discontinued Operations, Held-for-Sale [Member] | Klein Marine Services, Inc. [Member]
Gain (Loss) on Disposition of Business		2,393	0	2,393	0
Gain on sale of Klein		$ (2,393)	$ 0	$ (2,393)	$ 0