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Balance Sheet (Tables) | 3 Months Ended
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Apr. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Accounts and Contracts Receivables |
| As of April 30, 2019 |  | As of January 31, 2019
| Current |  | Long-term |  | Total |  | Current |  | Long-term |  | Total
Accounts receivable | $ | 14,401 |  |  | $ | 465 |  |  | $ | 14,866 |  |  | $ | 14,195 |  |  | $ | 712 |  |  | $ | 14,907 |
Less allowance for doubtful accounts | (2,113 | ) |  | — |  |  | (2,113 | ) |  | (2,113 | ) |  | — |  |  | (2,113 | )
Accounts receivable net of allowance for doubtful accounts | $ | 12,288 |  |  | $ | 465 |  |  | $ | 12,753 |  |  | $ | 12,082 |  |  | $ | 712 |  |  | $ | 12,794 |
Schedule of Inventories |
|  | April 30, 2019 |  | January 31, 2019
|  | (in thousands)
Inventories: |  |  |  |
Raw materials |  | $ | 5,705 |  |  | $ | 5,446 |
Finished goods |  | 4,948 |  |  | 5,229 |
Work in progress |  | 1,679 |  |  | 1,322 |
|  | 12,332 |  |  | 11,997 |
Less allowance for obsolescence |  | (1,089 | ) |  | (1,223 | )
Total inventories, net |  | $ | 11,243 |  |  | $ | 10,774 |
Schedule of Seismic Equipment Lease Pool and Property and Equipment |
|  | April 30, 2019 |  | January 31, 2019
|  | (in thousands)
Seismic equipment lease pool and property and equipment: |  |  |  |
Seismic equipment lease pool |  | $ | 144,991 |  |  | $ | 147,519 |
Land and buildings |  | 4,047 |  |  | 4,041 |
Furniture and fixtures |  | 10,087 |  |  | 9,897 |
Autos and trucks |  | 569 |  |  | 571 |
|  | 159,694 |  |  | 162,028 |
Accumulated depreciation and amortization |  | (146,857 | ) |  | (147,873 | )
Total seismic equipment lease pool and property and equipment, net |  | $ | 12,837 |  |  | $ | 14,155 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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