Balance Sheet (Tables)

3 Months Ended

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