Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Cash flows from operating activities:
Net loss	$ (3,984)	$ (6,642)
Adjustments to reconcile net loss to net cash used in operating activities:
PPP loan forgiveness	(850)	0
Depreciation and amortization	668	1,701
Stock-based compensation	121	230
Impairment of intangible assets	0	2,531
Recovery of doubtful accounts	(453)	0
Provision for inventory obsolescence	327	22
Gross profit from sale of lease pool equipment	0	(850)
Gross profit from sale of other equipment	(80)	0
Changes in:
Accounts receivable	1,602	3,728
Unbilled revenue	51	(9)
Inventories	(739)	(554)
Prepaid expenses and other current and long-term assets	(239)	201
Income taxes receivable and payable	(168)	424
Accounts payable, accrued expenses and other current liabilities	947	300
Deferred revenue	(10)	(153)
Net cash (used in) provided by operating activities	(2,807)	929
Cash flows from investing activities:
Purchases of seismic equipment held for lease	0	(110)
Purchases of property and equipment	(8)	(65)
Sale of used lease pool equipment	0	1,414
Sale of business, net of cash sold	187	0
Net cash provided by investing activities	179	1,239
Cash flows from financing activities:
Purchase of treasury stock	(2)	0
Net proceeds from preferred stock offering	503	0
Net proceeds from common stock offering	42	0
Preferred stock dividends	(576)	(559)
Net cash used in financing activities	(33)	(559)
Effect of changes in foreign exchange rates on cash, cash equivalents and restricted cash	51	(138)
Net (decrease) increase in cash, cash equivalents and restricted cash	(2,610)	1,471
Cash, cash equivalents and restricted cash, beginning of period	4,611	3,234
Cash, cash equivalents and restricted cash, end of period	2,001	4,705
Supplemental cash flow information:
Interest paid	9	11
Income taxes paid	31	149
Purchases of seismic equipment held for lease in accounts payable at end of period	$ 0	$ 702