Note 3 - Assets Held for Sale and Discontinued Operations - Held for Sale and Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Jan. 31, 2022
Loss recognized on classification as held for sale	$ (232)		$ (925)
Total assets of discontinued operations	3		159
Total liabilities of discontinued operations	271		953
Net Income (loss) from discontinued operations	386	$ (283)
Sale of assets held for sale	283	0
Lease Pool Equipment [Member]
Gross profit from sale of lease pool equipment	280	(0)
Discontinued Operations, Held-for-sale [Member]
Accounts receivable, net	37		177
Inventories, net	2		2
Prepaid expenses and other current assets	156		167
Seismic equipment lease pool and property and equipment, net	40		738
Total assets of discontinued operations	3		$ 159
Accounts payable	4	132
Deferred revenue	56	73
Accrued expenses and other current liabilities	203	507
Income taxes payable	8	241
Total liabilities of discontinued operations	271	953
Revenue from discontinued operations	0	30
Cost of discontinued operations	25	373
Selling, general and administrative	113	342
Recovery of doubtful accounts	0	(443)
Depreciation and amortization	0	1
Total operating expenses (income)	113	(100)
Operating loss	(138)	(243)
Other income (expenses)	524	(39)
Income (loss) before income taxes from discontinued operations	386	(282)
Provision for income taxes from discontinued operations	0
Sale of assets held for sale	283	$ 187
Discontinued Operations, Held-for-sale [Member] | Lease Pool Equipment [Member]
Gross profit from sale of lease pool equipment	$ (280)