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Balance Sheet - Continuing Operations (Tables)
3 Months Ended
Apr. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Accounts Receivable
 As of April 30, 2021As of January 31, 2021
 CurrentLong-termTotalCurrentLong-termTotal
Accounts receivable$4,601 $— $4,601 $5,695 $— $5,695 
Less allowance for doubtful accounts(952)— (952)(948)— (948)
Accounts receivable net of allowance for doubtful accounts$3,649 $— $3,649 $4,747 $— $4,747 
Schedule of Inventories
April 30, 2021January 31, 2021
 (in thousands)
Inventories:
Raw materials$7,276 $6,905 
Finished goods3,823 3,466 
Work in progress2,453 2,445 
13,552 12,816 
Less allowance for obsolescence(1,383)(1,363)
Total inventories, net$12,169 $11,453 
Schedule of Seismic Equipment Lease Pool and Property and Equipment
April 30, 2021January 31, 2021
 (in thousands)
Property and equipment:
Marine seismic service equipment$4,533 $5,969 
Land and buildings4,384 4,354 
Furniture and fixtures9,776 9,750 
Autos and trucks491 491 
19,184 20,564 
Accumulated depreciation and amortization(14,598)(15,813)
Total property and equipment, net$4,586 $4,751